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High Precision CP Violation Physics at LHCb

English title High Precision CP Violation Physics at LHCb
Applicant Schneider Olivier
Number 152784
Funding scheme Project funding
Research institution Laboratoire de physique des hautes énergies 2 EPFL - SB - IPEP - LPHE2
Institution of higher education EPF Lausanne - EPFL
Main discipline Particle Physics
Start/End 01.04.2014 - 31.03.2016
Approved amount 1'415'000.00
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Keywords (10)

B mesons; New Physics; heavy flavour; CP violation; CKM matrix; Standard Model; b quark; LHC; B physics; LHCb

Lay Summary (French)

Lead
Le grand collisionneur de protons (LHC) du laboratoire européen pour la physique des particules (CERN) a été construit pour explorer, au niveau le plus fondamental possible, les constituants élémentaires de la matière et leurs interactions. L'expérience LHCb porte un nom suggestif; en effet, son but principal est de tirer parti de l'énorme quantité de quark lourds appelés "b" produite au LHC dans les collisions entre protons de très haute énergie (correspondant à l'énergie acquise dans une différence de potentiel de plusieurs fois mille milliards de volts). L'étude de certaines désintégrations rares des particules contenant un quark b permet de tester les prédictions du "Modèle Standard", la théorie minimale décrivant tous les processus connus en physique des particules élémentaires. Si l'expérience révélait que certaines prédictions sont incorrectes, alors elle révélerait du même coup l'existence de nouveaux phénomènes encore inconnus.
Lay summary

L'expérience LHCb a été construite par une collaboration internationale de plusieurs centaines de physiciens, y compris les membres du Laboratoire de Physique des Hautes Energies de l'EPFL qui ont pris des responsabilités importantes dans l'élaboration et la mise sur pied du projet dès son origine. Ils ont en particulier développé et construit une partie de l'appareillage de l'expérience, incluant des détecteurs à micro-pistes de silicium et l'électronique de lecture des signaux. LHCb a enregistré efficacement des données d'excellente qualité durant la première période d'exploitation du LHC, entre fin 2009 et début 2013, à la moitié de l'énergie nominale. L'analyse de cette énorme masse de données, à laquelle le groupe de l'EPFL prend une part active, a produit une quantité de nouvelles observations et mesures, publiées dans plus de 180 articles scientifiques, mais n'a pas (encore) permis de trouver la faille du Modèle Standard. Des exemples d'analyses faites à l'EPFL sont l'étude de la violation de la symétrie entre matière et anti-matière dans la désintégrations de particules contenant un quark b, ainsi que de la polarisation du photon émis dans la désintégration d'un quark b en un quark s.

L'expérience continuera à tourner pendant la deuxième période d'exploitation du LHC (2015-2018), à une énergie presque doublée, ce qui permettra d'augmenter la sensibilité statistique de l'expérience. En 2019, l'expérience sera mise à jour afin d'en décupler le potentiel. Pour ceci, le groupe de l'EPFL développe de nouveaux "détecteurs à traces" en fibres scintillantes lues par des photo-détecteurs au silicium. La phase de développement se termine et laisse place maintenant à une phase de construction, avant l'installation prévue en 2018-2019.

Ce subside permet de financer des doctorants et de postdocs pour exploiter l'expérience, analyser les données, publier les résultats, et enfin construire les nouveaux éléments nécessaires à la mise à jour de l'expérience.

Direct link to Lay Summary Last update: 28.04.2014

Lay Summary (English)

Lead
The LHCb detector is designed for precise measurements of CP violation and rare B decays, exploiting the production at CERN’s Large Hadron Collider (LHC). The main physics aims are to characterize in detail the flavour structure in the quark sector, and look for New Physics in the decay of charm and bottom hadrons.
Lay summary

During the first LHC running period (November 2009 – February 2013), LHCb has efficiently recorded pp collisions at centre-of-mass energies up to 8 TeV. With these data the LHCb physics programme is being deployed and reaching maturity. More than 150 physics papers have already been published or submitted to peer-reviewed journals. Although much new territory has been explored, all results so far are consistent with the expectations of the Standard Model. After the current LHC shutdown (2013–2014), the experiment is expected to be able to record pp collisions at 13 TeV for three more years (2015–2017), multiplying the number of b-hadron decays available for analysis by a factor of 3–4. In parallel, the collaboration is preparing a major upgrade of the experiment to enable the collection of data with improved efficience from 2019 onwards.

Our particle physics group in Lausanne has played important roles in LHCb since the beginning of the project in 1995. Our detector construction and maintenance responsibilities cover the so-called TELL1 common readout boards, the powering system and analogue transmission electronics for the silicon vertex detector VELO, and the downstream tracking stations (Inner Tracker) of the Silicon Track. In addition, Switzerland has significantly invested in the upstream tracking stations (through University of Zurich) and in the online system, including the computer farm for the high-level trigger of the experiment. We are presently heavily involved in data analysis and in R&D studies in view of the upgrade of the downstream tracking stations, for which we have proposed a new technology based on scintillating fibres read out with silicon photomultipliers.

Direct link to Lay Summary Last update: 28.04.2014

Responsible applicant and co-applicants

Employees

Publications

Publication
Angular analysis of the $B^0 \to K^{*0} μ^+ μ^-$ decay using $3~{\rm fb}^{-1}$ of integrated luminosity
Aaij R and others, LHCb collaboration (2016), Angular analysis of the $B^0 \to K^{*0} μ^+ μ^-$ decay using $3~{\rm fb}^{-1}$ of integrated luminosity, in JHEP, 02, 104.
First observation of the decay $B_s^0 \to K_S^0 K^*(892)^0$ at LHCb
Aaij R and others, LHCb collaboration (2016), First observation of the decay $B_s^0 \to K_S^0 K^*(892)^0$ at LHCb, in JHEP , 01, 012.
First observation of the decay $D^0\to K^-π^+μ^+μ^-$ in the $ρ^0-ømega$ region of the dimuon mass spectrum
Aaij R and others, LHCb collaboration (2016), First observation of the decay $D^0\to K^-π^+μ^+μ^-$ in the $ρ^0-ømega$ region of the dimuon mass spectrum, in Phys. Lett. B, 757, 558.
First observation of the rare $B^+\to D^+ K^+ π^-$ decay
Aaij R and others, LHCb collaboration (2016), First observation of the rare $B^+\to D^+ K^+ π^-$ decay, in Phys. Rev. D, 93, 051101.
LHCb Upgrade: Scintillating Fibre Tracker
Tobin M, LHCb Upgrade Scintillating Fibre Tracker group (2016), LHCb Upgrade: Scintillating Fibre Tracker, in Frontier Detectors for Frontier Physics: Proceedings of the 13th Pisa Meeting on Advanced Detectors, La Biodola (Isola d'Elba), ItalyElsevier, Amsterdam.
Measurement of forward $W$ and $Z$ boson production in $pp$ collisions at $\sqrts=8$~TeV
Aaij R and others, LHCb collaboration (2016), Measurement of forward $W$ and $Z$ boson production in $pp$ collisions at $\sqrts=8$~TeV, in JHEP, 01, 155.
Measurements of prompt charm production cross-sections in $pp$ collisions at $\sqrts=13$~TeV
Aaij R and others, LHCb collaboration (2016), Measurements of prompt charm production cross-sections in $pp$ collisions at $\sqrts=13$~TeV, in JHEP, 03, 159.
Model-independent measurement of mixing parameters in $D^0 \to K_S^0 π^+π^-$ decays
Aaij R and others, LHCb collaboration (2016), Model-independent measurement of mixing parameters in $D^0 \to K_S^0 π^+π^-$ decays, in JHEP, 04, 033.
Novel real-time alignment and calibration of the LHCb detector in Run II
Xu Z and Tobin M, LHCb collaboration (2016), Novel real-time alignment and calibration of the LHCb detector in Run II, in Frontier Detectors for Frontier Physics: Proceedings of the 13th Pisa Meeting on Advanced Detectors, La Biodola (Isola d'Elba), ItalyElsevier, Amsterdam.
Observation of $B^0_s\to\barD^0 K^0_S$ and evidence for $B^0_s\to\barD^{*0} K^0_S$ decays
Aaij R and others, LHCb collaboration (2016), Observation of $B^0_s\to\barD^0 K^0_S$ and evidence for $B^0_s\to\barD^{*0} K^0_S$ decays, in Phys. Rev. Lett., 116, 161802.
Observation of the $B_s^0 \to J/ψϕϕ$ decay
Aaij R and others, LHCb collaboration (2016), Observation of the $B_s^0 \to J/ψϕϕ$ decay, in JHEP, 03, 040.
Preparation and commissioning of LHCb for the Run II of LHC
Puig A, LHCb collaboration (2016), Preparation and commissioning of LHCb for the Run II of LHC, in Frontier Detectors for Frontier Physics: Proceedings of the 13th Pisa Meeting on Advanced Detectors, La Biodola (Isola d'Elba), ItalyElsevier, Amsterdam.
Search for the lepton-flavour violating decay $D^0 \to e^\pmμ^\mp$
Aaij R and others, LHCb collaboration (2016), Search for the lepton-flavour violating decay $D^0 \to e^\pmμ^\mp$, in Phys. Lett. B, 754, 167.
Studies of the resonance structure in $D^0\to K^0_S K^{\pm}π^{\mp}$ decays
Aaij R and others, LHCb collaboration (2016), Studies of the resonance structure in $D^0\to K^0_S K^{\pm}π^{\mp}$ decays, in Phys. Rev. D, 93, 052018.
Study of $ψ(2S)$ production and cold nuclear matter effects in $p$Pb collisions at $\sqrt{s_{\rm NN}}=5$~TeV
Aaij R and others, LHCb collaboration (2016), Study of $ψ(2S)$ production and cold nuclear matter effects in $p$Pb collisions at $\sqrt{s_{\rm NN}}=5$~TeV, in JHEP, 03, 133.
Study of D$_{sJ}^{(*)+}$ mesons decaying to $D^{*+} K_S^0$ and $D^{*0} K^+$ final states
Aaij R and others, LHCb collaboration (2016), Study of D$_{sJ}^{(*)+}$ mesons decaying to $D^{*+} K_S^0$ and $D^{*0} K^+$ final states, in JHEP, 02, 133.
Study of the production of $\Lambda_b^0$ and $\barB^0$ hadrons in $pp$ collisions and first measurement of the $\Lambda_b^0\to J/ψ pK^-$ branching fraction
Aaij R and others, LHCb collaboration (2016), Study of the production of $\Lambda_b^0$ and $\barB^0$ hadrons in $pp$ collisions and first measurement of the $\Lambda_b^0\to J/ψ pK^-$ branching fraction, in Chin. Phys. C, 40, 1.
The LHCb Turbo stream
Puig A, LHCb trigger group (2016), The LHCb Turbo stream, in Frontier Detectors for Frontier Physics: Proceedings of the 13th Pisa Meeting on Advanced Detectors, La Biodola (Isola d'Elba), ItalyElsevier, Amsterdam.
Towards the measurement of photon polarisation in the decay B⁺ → K⁺ π⁻ π⁺ γ
Veneziano G (2016), Towards the measurement of photon polarisation in the decay B⁺ → K⁺ π⁻ π⁺ γ, EPFL, Lausanne, Switzerland.
$B$ flavour tagging using charm decays at the LHCb experiment
Aaij R and others, LHCb collaboration (2015), $B$ flavour tagging using charm decays at the LHCb experiment, in JINST, 10, P10005.
A study of CP violation in $B^\mp \to Dh^\mp$ ($h=K,π$) with the modes $D \to K^\mp π^\pm π^0$, $D \to π^+π^-π^0$ and $D \to K^+K^-π^0$
Aaij R and others, LHCb collaboration (2015), A study of CP violation in $B^\mp \to Dh^\mp$ ($h=K,π$) with the modes $D \to K^\mp π^\pm π^0$, $D \to π^+π^-π^0$ and $D \to K^+K^-π^0$, in Phys. Rev. D, 91, 112014.
Amplitude analysis of $B^0 \to \barD^0 K^+ π^-$ decays
Aaij R and others, LHCb collaboration (2015), Amplitude analysis of $B^0 \to \barD^0 K^+ π^-$ decays, in Phys. Rev. D, 92, 012012.
Angular analysis and differential branching fraction of the decay $B^0_s\toϕμ^+μ^-$
Aaij R and others, LHCb collaboration (2015), Angular analysis and differential branching fraction of the decay $B^0_s\toϕμ^+μ^-$, in JHEP, 09, 179.
Angular analysis of the $B^0 \to K^{*0} e^+ e^-$ decay in the low-$q^2$ region
Aaij R and others, LHCb collaboration (2015), Angular analysis of the $B^0 \to K^{*0} e^+ e^-$ decay in the low-$q^2$ region, in JHEP, 04, 064.
Dalitz plot analysis of $B^0 \to \barD^0 π^+π^-$ decays
Aaij R and others, LHCb collaboration (2015), Dalitz plot analysis of $B^0 \to \barD^0 π^+π^-$ decays, in Phys. Rev. D, 92, 032002.
Determination of the branching fractions of $B_s^0 \to D_s^{\mp} K^{\pm}$ and $B^0\to D_s^- K^+$
Aaij R and others, LHCb collaboration (2015), Determination of the branching fractions of $B_s^0 \to D_s^{\mp} K^{\pm}$ and $B^0\to D_s^- K^+$, in JHEP, 05, 019.
Determination of the polarization amplitudes and CP asymmetries in B0 → φ K*(892)0 at LHCb
Nguyen A D (2015), Determination of the polarization amplitudes and CP asymmetries in B0 → φ K*(892)0 at LHCb, EPFL, Lausanne, Switzerland.
Determination of the quark coupling strength $|V_{ub}|$ using baryonic decays
Aaij R and others, LHCb collaboration (2015), Determination of the quark coupling strength $|V_{ub}|$ using baryonic decays, in Nature Phys., 11, 743.
Differential branching fraction and angular analysis of $\Lambda^0_b \to \Lambda μ^+μ^-$ decays
Aaij R and others, LHCb collaboration (2015), Differential branching fraction and angular analysis of $\Lambda^0_b \to \Lambda μ^+μ^-$ decays, in JHEP, 06, 115.
Evidence for the strangeness-changing weak decay $\Xi_b^-\to\Lambda_b^0π^-$
Aaij R and others, LHCb collaboration (2015), Evidence for the strangeness-changing weak decay $\Xi_b^-\to\Lambda_b^0π^-$, in Phys. Rev. Lett., 115, 241801.
First measurement of the differential branching fraction and CP asymmetry of the $B^\pm\toπ^\pmμ^+μ^-$ decay
Aaij R and others, LHCb collaboration (2015), First measurement of the differential branching fraction and CP asymmetry of the $B^\pm\toπ^\pmμ^+μ^-$ decay, in JHEP, 10, 034.
First observation and amplitude analysis of the $B^-\to D^+K^-π^-$ decay
Aaij R and others, LHCb collaboration (2015), First observation and amplitude analysis of the $B^-\to D^+K^-π^-$ decay, in Phys. Rev. D, 91, 092002.
First observation and measurement of the branching fraction for the decay $B^0_s \to D_s^{*\mp} K^{\pm}$
Aaij R and others, LHCb collaboration (2015), First observation and measurement of the branching fraction for the decay $B^0_s \to D_s^{*\mp} K^{\pm}$, in JHEP, 06, 130.
First observation of top quark production in the forward region
Aaij R and others, LHCb collaboration (2015), First observation of top quark production in the forward region, in Phys. Rev. Lett., 115, 112001.
Forward production of $\Upsilon$ mesons in $pp$ collisions at $\sqrts=7$ and 8~TeV
Aaij R and others, LHCb collaboration (2015), Forward production of $\Upsilon$ mesons in $pp$ collisions at $\sqrts=7$ and 8~TeV, in JHEP, 11, 103.
Identification of beauty and charm quark jets at LHCb
Aaij R and others, LHCb collaboration (2015), Identification of beauty and charm quark jets at LHCb, in JINST, 10, P06013.
LHCb detector performance
Aaij R and others, LHCb collaboration (2015), LHCb detector performance, in Int. J. Mod. Phys. A, 30, 1530022.
Measurement of $B_c^+$ production in proton-proton collisions at $\sqrts=8$~TeV
Aaij R and others, LHCb collaboration (2015), Measurement of $B_c^+$ production in proton-proton collisions at $\sqrts=8$~TeV, in Phys. Rev. Lett., 114, 132001.
Measurement of CP asymmetries and polarisation fractions in $B_s^0 \to K^{*0}\barK{}^{*0}$ decays
Aaij R and others, LHCb collaboration (2015), Measurement of CP asymmetries and polarisation fractions in $B_s^0 \to K^{*0}\barK{}^{*0}$ decays, in JHEP, 07, 166.
Measurement of CP violation in $B^0 \to J/ψ K^0_S$ decays
Aaij R and others, LHCb collaboration (2015), Measurement of CP violation in $B^0 \to J/ψ K^0_S$ decays, in Phys. Rev. Lett. , 115, 031601.
Measurement of CP violation parameters and polarisation fractions in $ B_s^0\to J/ψ \barK^{*0}$ decays
Aaij R and others, LHCb collaboration (2015), Measurement of CP violation parameters and polarisation fractions in $ B_s^0\to J/ψ \barK^{*0}$ decays, in JHEP, 11, 082.
Measurement of forward $J/ψ$ production cross-sections in $pp$ collisions at $\sqrts=13$~TeV
Aaij R and others, LHCb collaboration (2015), Measurement of forward $J/ψ$ production cross-sections in $pp$ collisions at $\sqrts=13$~TeV, in JHEP, 10, 172.
Measurement of forward $Z\to e^+e^-$ production at $\sqrts=8$~TeV
Aaij R and others, LHCb collaboration (2015), Measurement of forward $Z\to e^+e^-$ production at $\sqrts=8$~TeV, in JHEP, 05, 109.
Measurement of indirect CP asymmetries in $D^0\to K^-K^+$ and $D^0\to π^-π^+$ decays using semileptonic $B$ decays
Aaij R and others, LHCb collaboration (2015), Measurement of indirect CP asymmetries in $D^0\to K^-K^+$ and $D^0\to π^-π^+$ decays using semileptonic $B$ decays, in JHEP, 04, 043.
Measurement of J = y production cross-section in pp collisions at p s = 13 TeV at LHCb
Komarov I, LHCb collaboration (2015), Measurement of J = y production cross-section in pp collisions at p s = 13 TeV at LHCb, in The European Physical Society Conference on High Energy Physics, Vienna, AustriaProoceedings of Science, Bologna, Italy.
Measurement of the $B_s^0\toϕϕ$ branching fraction and search for the decay $B^0\toϕϕ$
Aaij R and others, LHCb collaboration (2015), Measurement of the $B_s^0\toϕϕ$ branching fraction and search for the decay $B^0\toϕϕ$, in JHEP, 10, 053.
Measurement of the $Z+b$-jet cross-section in $pp$ collisions at $\sqrts=7$~TeV in the forward region
Aaij R and others, LHCb collaboration (2015), Measurement of the $Z+b$-jet cross-section in $pp$ collisions at $\sqrts=7$~TeV in the forward region, in JHEP, 01, 064.
Measurement of the $η_c (1S)$ production cross-section in proton-proton collisions via the decay $η_c (1S) \to p \barp$
Aaij R and others, LHCb collaboration (2015), Measurement of the $η_c (1S)$ production cross-section in proton-proton collisions via the decay $η_c (1S) \to p \barp$, in Eur. Phys. J. C, 75, 311.
Measurement of the branching fraction ratio $\mathcalB(B_c^+ \to ψ(2S)π^+)/\mathcalB(B_c^+ \to J/ψ π^+)$
Aaij R and others, LHCb collaboration (2015), Measurement of the branching fraction ratio $\mathcalB(B_c^+ \to ψ(2S)π^+)/\mathcalB(B_c^+ \to J/ψ π^+)$, in Phys. Rev. D, 92, 07007.
Measurement of the CP-violating phase $β$ in $B^0\to J/ψ π^+π^-$ decays and limits on penguin effects
Aaij R and others, LHCb collaboration (2015), Measurement of the CP-violating phase $β$ in $B^0\to J/ψ π^+π^-$ decays and limits on penguin effects, in Phys. Lett. B, 742, 38.
Measurement of the exclusive $\Upsilon$ production cross-section in $pp$ collisions at $\sqrts=7$~TeV and $8$~TeV
Aaij R and others, LHCb collaboration (2015), Measurement of the exclusive $\Upsilon$ production cross-section in $pp$ collisions at $\sqrts=7$~TeV and $8$~TeV, in JHEP, 09, 084.
Measurement of the forward $Z$ boson production cross-section in $pp$ collisions at $\sqrts=7$ TeV
Aaij R and others, LHCb collaboration (2015), Measurement of the forward $Z$ boson production cross-section in $pp$ collisions at $\sqrts=7$ TeV, in JHEP, 08, 039.
Measurement of the forward-backward asymmetry in $Z/γ^* \to μ^+μ^-$ decays and determination of the effective weak mixing angle
Aaij R and others, LHCb collaboration (2015), Measurement of the forward-backward asymmetry in $Z/γ^* \to μ^+μ^-$ decays and determination of the effective weak mixing angle, in JHEP, 11, 190.
Measurement of the inelastic $pp$ cross-section at a centre-of-mass energy of $\sqrts=7$~TeV
Aaij R and others, LHCb collaboration (2015), Measurement of the inelastic $pp$ cross-section at a centre-of-mass energy of $\sqrts=7$~TeV, in JHEP, 02, 129.
Measurement of the lifetime of the $B_c^+$ meson using the $B_c^+\to J/ψπ^+$ decay mode
Aaij R and others, LHCb collaboration (2015), Measurement of the lifetime of the $B_c^+$ meson using the $B_c^+\to J/ψπ^+$ decay mode, in Phys. Lett. B, 742, 29.
Measurement of the ratio of branching fractions $\mathcalB(\barB^0 \to D^{*+}τ^-\bar{ν}_{τ})/\mathcalB(\barB^0 \to D^{*+}μ^-\bar{ν}_{μ})$
Aaij R and others, LHCb collaboration (2015), Measurement of the ratio of branching fractions $\mathcalB(\barB^0 \to D^{*+}τ^-\bar{ν}_{τ})/\mathcalB(\barB^0 \to D^{*+}μ^-\bar{ν}_{μ})$, in Phys. Rev. Lett., 115, 111803.
Measurement of the semileptonic CP asymmetry in $B^0-\barB^0$ mixing
Aaij R and others, LHCb collaboration (2015), Measurement of the semileptonic CP asymmetry in $B^0-\barB^0$ mixing, in Phys. Rev. Lett. , 114, 041601.
Measurement of the time-dependent CP asymmetries in $B_s^0\to J/ψ K_{\rm S}^0$
Aaij R and others, LHCb collaboration (2015), Measurement of the time-dependent CP asymmetries in $B_s^0\to J/ψ K_{\rm S}^0$, in JHEP, 06, 131.
Measurement of the time-integrated CP asymmetry in $D^0 \to K^0_S K^0_S$ decays
Aaij R and others, LHCb collaboration (2015), Measurement of the time-integrated CP asymmetry in $D^0 \to K^0_S K^0_S$ decays, in JHEP, 10, 055.
Measurement of the track reconstruction efficiency at LHCb
Aaij R and others, LHCb collaboration (2015), Measurement of the track reconstruction efficiency at LHCb, in JINST, 10, P02007.
Model-independent confirmation of the $Z(4430)^-$ state
Aaij R and others, LHCb collaboration (2015), Model-independent confirmation of the $Z(4430)^-$ state, in Phys. Rev. D, 92, 112009.
Observation of $J/ψ p$ resonances consistent with pentaquark states in $\Lambda_b^0 \to J/ψ K^- p$ decays
Aaij R and others, LHCb collaboration (2015), Observation of $J/ψ p$ resonances consistent with pentaquark states in $\Lambda_b^0 \to J/ψ K^- p$ decays, in Phys. Rev. Lett. , 115, 072001.
Observation of the ${B^0 \to ρ^0 ρ^0}$ decay from an amplitude analysis of ${B^0 \to (π^+π^-)(π^+π^-)}$ decays
Aaij R and others, LHCb collaboration (2015), Observation of the ${B^0 \to ρ^0 ρ^0}$ decay from an amplitude analysis of ${B^0 \to (π^+π^-)(π^+π^-)}$ decays, in Phys. Lett. B, 747, 468.
Observation of the $B^0_s\toη'η'$ decay
Aaij R and others, LHCb collaboration (2015), Observation of the $B^0_s\toη'η'$ decay, in Phys. Rev. Lett., 115, 051801.
Observation of the decay $\barB_s^0 \to ψ(2S) K^+ π^-$
Aaij R and others, LHCb collaboration (2015), Observation of the decay $\barB_s^0 \to ψ(2S) K^+ π^-$, in Phys. Lett. B, 747, 484.
Observation of the rare $B^0_s\toμ^+μ^-$ decay from the combined analysis of CMS and LHCb data
Khachatryan V and others, LHCb collaboration (2015), Observation of the rare $B^0_s\toμ^+μ^-$ decay from the combined analysis of CMS and LHCb data, in Nature, 522, 68.
Observation of two new $\Xi_b^-$ baryon resonances
Aaij R and others, LHCb collaboration (2015), Observation of two new $\Xi_b^-$ baryon resonances, in Phys. Rev. Lett., 114, 062004.
Precise measurements of the properties of the $B_1(5721)^{0,+}$ and $B^*_2(5747)^{0,+}$ states and observation of $B^{+,0}π^{-,+}$ mass structures
Aaij R and others, LHCb collaboration (2015), Precise measurements of the properties of the $B_1(5721)^{0,+}$ and $B^*_2(5747)^{0,+}$ states and observation of $B^{+,0}π^{-,+}$ mass structures, in JHEP, 04, 024.
Precision measurement of CP violation in $B_s^0 \to J/ψ K^+K^-$ decays
Aaij R and others, LHCb collaboration (2015), Precision measurement of CP violation in $B_s^0 \to J/ψ K^+K^-$ decays, in Phys. Rev. Lett., 114, 041801.
Quantum numbers of the $X(3872)$ state and orbital angular momentum in its $ρ^0 Jψ$ decay
Aaij R and others, LHCb collaboration (2015), Quantum numbers of the $X(3872)$ state and orbital angular momentum in its $ρ^0 Jψ$ decay, in Phys. Rev. D, 92, 011102(R).
Quenching the scintillation in CF4 Cherenkov gas radiator
Blake T and others (2015), Quenching the scintillation in CF4 Cherenkov gas radiator, in Nucl. Instrum. Meth. A, 791, 27.
Scintillating Fibre Tracking at High Luminosity Colliders
Joram C Haefeli G and Leverington B (2015), Scintillating Fibre Tracking at High Luminosity Colliders, in JINST, 10, C08005.
Search for exotic massive long-lived particles decaying semileptonically in the LHCb detector
Muster B L (2015), Search for exotic massive long-lived particles decaying semileptonically in the LHCb detector, EPFL, Lausanne, Switzerland.
Search for hidden-sector bosons in $B^0 \to K^{*0}μ^+μ^-$ decays
Aaij R and others, LHCb collaboration (2015), Search for hidden-sector bosons in $B^0 \to K^{*0}μ^+μ^-$ decays, in Phys. Rev. Lett., 115, 161802.
Search for long-lived heavy charged particles using a ring imaging Cherenkov technique at LHCb
Aaij R and others, LHCb collaboration (2015), Search for long-lived heavy charged particles using a ring imaging Cherenkov technique at LHCb, in Eur. Phys. J. C, 75, 595.
Search for long-lived particles decaying to jet pairs
Aaij R and others, LHCb collaboration (2015), Search for long-lived particles decaying to jet pairs, in Eur. Phys. J. C, 75, 152.
Search for the $\Lambda^0_b \to \Lambda η^\prime$ and $\Lambda^0_b \to \Lambda η$ decays with the LHCb detector
Aaij R and others, LHCb collaboration (2015), Search for the $\Lambda^0_b \to \Lambda η^\prime$ and $\Lambda^0_b \to \Lambda η$ decays with the LHCb detector, in JHEP, 09, 006.
Search for the decay $B_s^0\to \barD^0 f_0(980)$
Aaij R and others, LHCb collaboration (2015), Search for the decay $B_s^0\to \barD^0 f_0(980)$, in JHEP, 08, 005.
Search for the lepton flavour violating decay $τ^-\toμ^-μ^+μ^-$
Aaij R and others, LHCb collaboration (2015), Search for the lepton flavour violating decay $τ^-\toμ^-μ^+μ^-$, in JHEP, 02, 121.
Search for the rare decays $B^0\to J/ψ γ$ and $B^0_s \to J/ψ γ$
Aaij R and others, LHCb collaboration (2015), Search for the rare decays $B^0\to J/ψ γ$ and $B^0_s \to J/ψ γ$, in Phys. Rev. D, 92, 112002.
Study of $B^{-}\to DK^-π^+π^-$ and $B^-\to Dπ^-π^+π^-$ decays and determination of the CKM angle $γ$
Aaij R and others, LHCb collaboration (2015), Study of $B^{-}\to DK^-π^+π^-$ and $B^-\to Dπ^-π^+π^-$ decays and determination of the CKM angle $γ$, in Phys. Rev. D, 92, 112005.
Study of $W$ boson production in association with beauty and charm
Aaij R and others, LHCb collaboration (2015), Study of $W$ boson production in association with beauty and charm, in Phys. Rev. D, 92, 052001.
Study of $η-η^{\prime}$ mixing from measurement of $B^0_{(s)} \to J/ψ η^{(\prime)}$ decay rates
Aaij R and others, LHCb collaboration (2015), Study of $η-η^{\prime}$ mixing from measurement of $B^0_{(s)} \to J/ψ η^{(\prime)}$ decay rates, in JHEP, 01, 024.
Study of charmless B (s) meson decays involving η ' and φ intermediate states at the LHCb experiment
Prisciandaro J (2015), Study of charmless B (s) meson decays involving η ' and φ intermediate states at the LHCb experiment, EPFL, Lausanne, Switzerland.
Study of the rare $B_s^0$ and $B^0$ decays into the $π^+π^-μ^+μ^-$ final state
Aaij R and others, LHCb collaboration (2015), Study of the rare $B_s^0$ and $B^0$ decays into the $π^+π^-μ^+μ^-$ final state, in Phys. Lett. B, 743, 46.
A study of CP violation in $B^{\pm} \to DK^{\pm}$ and $B^{\pm} \to Dπ^{\pm}$ decays with $D \to K_S^0K^{\pm}π^{\mp}$ final states
Aaij R and others, LHCb collaboration (2014), A study of CP violation in $B^{\pm} \to DK^{\pm}$ and $B^{\pm} \to Dπ^{\pm}$ decays with $D \to K_S^0K^{\pm}π^{\mp}$ final states, in Phys. Lett. B, 733, 36.
Angular analysis of charged and neutral $B \to K μ^+μ^-$ decays
Aaij R and others, LHCb collaboration (2014), Angular analysis of charged and neutral $B \to K μ^+μ^-$ decays, in JHEP, 05, 082.
CP-violating triple-product asymmetries in Charm decays
Martinelli M, LHCb and BaBar collaborations (2014), CP-violating triple-product asymmetries in Charm decays, in The 8th International Workshop on the CKM Unitarity Triangle, Vienna, AustriaCornell University Library, Ithaca, NY, USA.
Dalitz plot analysis of $B_s^0 \to \barD^0 K^- π^+$ decays
Aaij R and others, LHCb collaboration (2014), Dalitz plot analysis of $B_s^0 \to \barD^0 K^- π^+$ decays, in Phys. Rev. D, 90, 072003.
Determination of $γ$ and $-2β_s$ from charmless two-body decays of beauty mesons
Aaij R and others, LHCb collaboration (2014), Determination of $γ$ and $-2β_s$ from charmless two-body decays of beauty mesons, in Phys. Lett. B, 741, 1.
Differential branching fractions and isospin asymmetries of $B \to K^{(*)} μ^+ μ^-$ decays
Aaij R and others, LHCb collaboration (2014), Differential branching fractions and isospin asymmetries of $B \to K^{(*)} μ^+ μ^-$ decays, in JHEP, 06, 133.
Effective lifetime measurements in the $B_s^0 \to K^+K^-$, $B^0\to K^+π^-$ and $B_s^0 \to π^+K^-$ decays
Aaij R and others, LHCb collaboration (2014), Effective lifetime measurements in the $B_s^0 \to K^+K^-$, $B^0\to K^+π^-$ and $B_s^0 \to π^+K^-$ decays, in Phys. Lett. B, 736, 446.
Evidence for CP violation in $B^+\to p \barp K^+$ decays
Aaij R and others, LHCb collaboration (2014), Evidence for CP violation in $B^+\to p \barp K^+$ decays, in Phys. Rev. Lett., 113, 141801.
Evidence for the decay $B_c^+ \to J/ψ 3π^+ 2π^-$
Aaij R and others, LHCb collaboration (2014), Evidence for the decay $B_c^+ \to J/ψ 3π^+ 2π^-$, in JHEP, 05, 148.
Evidence for the decay $X(3872)\toψ(2S)γ$
Aaij R and others, LHCb collaboration (2014), Evidence for the decay $X(3872)\toψ(2S)γ$, in Nucl. Phys. B, 886, 665.
First measurement of the charge asymmetry in beauty-quark pair production
Aaij R and others, LHCb collaboration (2014), First measurement of the charge asymmetry in beauty-quark pair production, in Phys. Rev. Lett., 113, 082003.
First observation of a baryonic $B_c^+$ decay
Aaij R and others, LHCb collaboration (2014), First observation of a baryonic $B_c^+$ decay, in Phys. Rev. Lett., 113, 152003.
First observations of the rare decays $B^+\to K^+π^+π^-μ^+μ^-$ and $B^+\toϕ K^+μ^+μ^-$
Aaij R and others, LHCb collaboration (2014), First observations of the rare decays $B^+\to K^+π^+π^-μ^+μ^-$ and $B^+\toϕ K^+μ^+μ^-$, in JHEP, 10, 064.
Latest LHCb results
Martinelli M, LHCb collaboration (2014), Latest LHCb results, in QCD@Work 2014 – 7th International Workshop on Quantum Chromodynamics Theory and Experiment , Giovinazzo (Bari) ItalyEPJ Web of Conferences, web.
Mass distributions marginalized over per-event errors
Martínez Santos D and Dupertuis F (2014), Mass distributions marginalized over per-event errors, in Nucl. Instrum. Meth. A, 764, 150.
Measurement of $\Upsilon$ production in $pp$ collisions at $\sqrts=2.76$~TeV
Aaij R and others, LHCb collaboration (2014), Measurement of $\Upsilon$ production in $pp$ collisions at $\sqrts=2.76$~TeV, in Eur. Phys. J. C, 74, 2835.
Measurement of $ψ(2S)$ polarisation in $pp$ collisions at $\sqrts=7$~TeV
Aaij R and others, LHCb collaboration (2014), Measurement of $ψ(2S)$ polarisation in $pp$ collisions at $\sqrts=7$~TeV, in Eur. Phys. J. C, 74, 2872.
Measurement of charged particle multiplicities and densities in $pp$ collisions at $\sqrts=7$~TeV in the forward region
Aaij R and others, LHCb collaboration (2014), Measurement of charged particle multiplicities and densities in $pp$ collisions at $\sqrts=7$~TeV in the forward region, in Eur. Phys. J. C, 74, 2888.
Measurement of CP asymmetries in the decays $B^0 \to K^{*0} μ^+ μ^-$ and $B^+ \to K^+ μ^+ μ^-$
Aaij R and others, LHCb collaboration (2014), Measurement of CP asymmetries in the decays $B^0 \to K^{*0} μ^+ μ^-$ and $B^+ \to K^+ μ^+ μ^-$, in JHEP, 09, 177.
Measurement of CP asymmetry in $B^0_s \to D^{\mp}_s K^{\pm}$ decays
Aaij R and others, LHCb collaboration (2014), Measurement of CP asymmetry in $B^0_s \to D^{\mp}_s K^{\pm}$ decays, in JHEP, 11, 060.
Measurement of CP asymmetry in $D^0 \to K^- K^+$ and $D^0 \to π^- π^+$ decays
Aaij R and others, LHCb collaboration (2014), Measurement of CP asymmetry in $D^0 \to K^- K^+$ and $D^0 \to π^- π^+$ decays, in JHEP, 07, 041.
Measurement of CP violation and constraints on the CKM angle $γ$ in $B^{\pm}\to D K^{\pm}$ with $D \to K_S^0 π^+ π^-$ decays
Aaij R and others, LHCb collaboration (2014), Measurement of CP violation and constraints on the CKM angle $γ$ in $B^{\pm}\to D K^{\pm}$ with $D \to K_S^0 π^+ π^-$ decays, in Nucl. Phys. B, 888, 169.
Measurement of CP violation in $B_s^0 \to ϕ ϕ$ decays
Aaij R and others, LHCb collaboration (2014), Measurement of CP violation in $B_s^0 \to ϕ ϕ$ decays, in Phys. Rev. D, 90, 052011.
Measurement of CP violation parameters in $B^0 \to DK^{*0}$ decays
Aaij R and others, LHCb collaboration (2014), Measurement of CP violation parameters in $B^0 \to DK^{*0}$ decays, in Phys. Rev. D, 90, 112002.
Measurement of polarization amplitudes and CP asymmetries in $B^0 \to ϕ K^*(892)^0$
Aaij R and others, LHCb collaboration (2014), Measurement of polarization amplitudes and CP asymmetries in $B^0 \to ϕ K^*(892)^0$, in JHEP, 05, 069.
Measurement of resonant and CP components in $\barB_s^0\to J/ψπ^+π^-$ decays
Aaij R and others, LHCb collaboration (2014), Measurement of resonant and CP components in $\barB_s^0\to J/ψπ^+π^-$ decays, in Phys. Rev. D, 89, 092006.
Measurement of the $\bar B_s^0$ meson lifetime in $D_s^+π^-$ decays
Aaij R and others, LHCb collaboration (2014), Measurement of the $\bar B_s^0$ meson lifetime in $D_s^+π^-$ decays, in Phys. Rev. Lett., 113, 172001.
Measurement of the $\barB^0-B^0$ and $\barB^0_s-B^0_s$ production asymmetries in $pp$ collisions at $\sqrts=7$~TeV
Aaij R and others, LHCb collaboration (2014), Measurement of the $\barB^0-B^0$ and $\barB^0_s-B^0_s$ production asymmetries in $pp$ collisions at $\sqrts=7$~TeV, in Phys. Lett. B, 739, 218.
Measurement of the $\Xi_b^-$ and $\Omega_b^-$ baryon lifetimes
Aaij R and others, LHCb collaboration (2014), Measurement of the $\Xi_b^-$ and $\Omega_b^-$ baryon lifetimes, in Phys. Lett. B, 736, 154.
Measurement of the $B_c^+$ meson lifetime using $B_c^+ \to J/ψ μ^+ ν_{μ} X$ decays
Aaij R and others, LHCb collaboration (2014), Measurement of the $B_c^+$ meson lifetime using $B_c^+ \to J/ψ μ^+ ν_{μ} X$ decays, in Eur. Phys. J. C, 74, 2839.
Measurement of the $çhi_b(3P)$ mass and of the relative rate of $çhi_{b1}(1P)$ and $çhi_{b2}(1P)$ production
Aaij R and others, LHCb collaboration (2014), Measurement of the $çhi_b(3P)$ mass and of the relative rate of $çhi_{b1}(1P)$ and $çhi_{b2}(1P)$ production, in JHEP, 10, 088.
Measurement of the CKM angle $γ$ using $B^\pm \to D K^\pm$ with $D \to K^0_{\rm S} π^+π^-, K^0_{\rm S} K^+ K^-$ decays
Aaij R and others, LHCb collaboration (2014), Measurement of the CKM angle $γ$ using $B^\pm \to D K^\pm$ with $D \to K^0_{\rm S} π^+π^-, K^0_{\rm S} K^+ K^-$ decays, in JHEP, 10, 097.
Measurement of the CP-violating phase $ϕ_s$ in $\barB^0_s\to D_s^+D_s^-$ decays
Aaij R and others, LHCb collaboration (2014), Measurement of the CP-violating phase $ϕ_s$ in $\barB^0_s\to D_s^+D_s^-$ decays, in Phys. Rev. Lett., 113, 211801.
Measurement of the CP-violating phase $ϕ_s$ in $\barB^0_s\to J/ψ π^+π^-$ decays
Aaij R and others, LHCb collaboration (2014), Measurement of the CP-violating phase $ϕ_s$ in $\barB^0_s\to J/ψ π^+π^-$ decays, in Phys. Lett. B, 736, 186.
Measurement of the forward $W$ boson cross-section in $pp$ collisions at $\sqrts=7$~TeV
Aaij R and others, LHCb collaboration (2014), Measurement of the forward $W$ boson cross-section in $pp$ collisions at $\sqrts=7$~TeV, in JHEP, 12, 079.
Measurement of the ratio of $B_c^+$ branching fractions to $J/ψπ^+$ and $J/ψμ^+ν_μ$
Aaij R and others, LHCb collaboration (2014), Measurement of the ratio of $B_c^+$ branching fractions to $J/ψπ^+$ and $J/ψμ^+ν_μ$, in Phys. Rev. D, 90, 032009.
Measurement of the resonant and CP components in $\barB^0\to J/ψ π^+π^-$ decays
Aaij R and others, LHCb collaboration (2014), Measurement of the resonant and CP components in $\barB^0\to J/ψ π^+π^-$ decays, in Phys. Rev. D, 90, 012003.
Measurements of b-baryon properties at LHCb
Märki R (2014), Measurements of b-baryon properties at LHCb, EPFL, Lausanne, Switzerland.
Measurements of b-hadron lifetimes and the calibration and performance of the LHCb tracking system
Dupertuis F G (2014), Measurements of b-hadron lifetimes and the calibration and performance of the LHCb tracking system, EPFL, Lausanne, Switzerland.
Measurements of CP violation in the three-body phase space of charmless $B^{\pm}$ decays
Aaij R and others, LHCb collaboration (2014), Measurements of CP violation in the three-body phase space of charmless $B^{\pm}$ decays, in Phys. Rev. D, 90, 112004.
Measurements of the $B^+, B^0, B^0_s$ meson and $\Lambda^0_b$ baryon lifetimes
Aaij R and others, LHCb collaboration (2014), Measurements of the $B^+, B^0, B^0_s$ meson and $\Lambda^0_b$ baryon lifetimes, in JHEP, 04, 114.
Observation of $B^0_s \to K^{*\pm}K^\mp$ and evidence for $B^0_s \to K^{*-}π^+$ decays
Aaij R and others, LHCb collaboration (2014), Observation of $B^0_s \to K^{*\pm}K^\mp$ and evidence for $B^0_s \to K^{*-}π^+$ decays, in New J. Phys., 16, 123001.
Observation of $Z$ production in proton-lead collisions at LHCb
Aaij R and others, LHCb collaboration (2014), Observation of $Z$ production in proton-lead collisions at LHCb, in JHEP, 09, 030.
Observation of associated production of a $Z$ boson with a $D$ meson in the forward region
Aaij R and others, LHCb collaboration (2014), Observation of associated production of a $Z$ boson with a $D$ meson in the forward region, in JHEP, 04, 091.
Observation of charmonium pairs produced exclusively in $pp$ collisions
Aaij R and others, LHCb collaboration (2014), Observation of charmonium pairs produced exclusively in $pp$ collisions, in J. Phys. G, 41, 115002.
Observation of overlapping spin-1 and spin-3 $\barD^0 K^-$ resonances at mass $2.86~{\rm GeV}/c^2$
Aaij R and others, LHCb collaboration (2014), Observation of overlapping spin-1 and spin-3 $\barD^0 K^-$ resonances at mass $2.86~{\rm GeV}/c^2$, in Phys. Rev. Lett., 113, 162001.
Observation of photon polarization in the $b\to sγ$ transition
Aaij R and others, LHCb collaboration (2014), Observation of photon polarization in the $b\to sγ$ transition, in Phys. Rev. Lett., 112, 161801.
Observation of the $\Lambda_b^0 \to J/ψ p π^-$ decay
Aaij R and others, LHCb collaboration (2014), Observation of the $\Lambda_b^0 \to J/ψ p π^-$ decay, in JHEP, 07, 103.
Observation of the $B_s^0 \to J/ψ K_s^0 K^\pm π^\mp$ decay
Aaij R and others, LHCb collaboration (2014), Observation of the $B_s^0 \to J/ψ K_s^0 K^\pm π^\mp$ decay, in JHEP, 07, 140.
Observation of the resonant character of the $Z(4430)^-$ state
Aaij R and others, LHCb collaboration (2014), Observation of the resonant character of the $Z(4430)^-$ state, in Phys. Rev. Lett., 112, 222002.
Performance of the LHCb Vertex Locator
Aaij R and others (2014), Performance of the LHCb Vertex Locator, in JINST, 9, P09007.
Precision luminosity measurements at LHCb
Aaij R and others, LHCb collaboration (2014), Precision luminosity measurements at LHCb, in JINST, 9, P12005.
Precision measurement of the mass and lifetime of the $\Xi_b^-$ baryon
Aaij R and others, LHCb collaboration (2014), Precision measurement of the mass and lifetime of the $\Xi_b^-$ baryon, in Phys. Rev. Lett., 113, 242002.
Precision measurement of the mass and lifetime of the $\Xi_b^0$ baryon
Aaij R and others, LHCb collaboration (2014), Precision measurement of the mass and lifetime of the $\Xi_b^0$ baryon, in Phys. Rev. Lett., 113, 032001.
Precision measurement of the ratio of the $\Lambda^0_b$ to $øverlineB^0$ lifetimes
Aaij R and others, LHCb collaboration (2014), Precision measurement of the ratio of the $\Lambda^0_b$ to $øverlineB^0$ lifetimes, in Phys. Lett. B, 734, 122.
Radiative electroweak penguins at LHCb
Puig A (2014), Radiative electroweak penguins at LHCb, in The 15th International Conference on B-Physics at Frontier Machines at the University of Edinburgh, Edinburgh, UKProceedings of Science, Bologna, Italy.
Search for (Higgs-like) bosons decaying into a pair of long- lived exotic particles in the LHCb experiment
Rouvinet J (2014), Search for (Higgs-like) bosons decaying into a pair of long- lived exotic particles in the LHCb experiment, EPFL, Lausanne, Switzerland.
Search for CP violation in $D^{\pm}\to K^0_{\mathrmS} K^{\pm}$ and $D^{\pm}_s\to K^0_{\mathrmS} π^{\pm}$ decays
Aaij R and others, LHCb collaboration (2014), Search for CP violation in $D^{\pm}\to K^0_{\mathrmS} K^{\pm}$ and $D^{\pm}_s\to K^0_{\mathrmS} π^{\pm}$ decays, in JHEP, 10, 025.
Search for CP violation in $D^0 \to π^-π^+π^0$ decays with the energy test
Aaij R and others, LHCb collaboration (2014), Search for CP violation in $D^0 \to π^-π^+π^0$ decays with the energy test, in Phys. Lett. B, 740, 158.
Search for CP violation using T-odd correlations in $D^0 \to K^+K^-π^+π^-$ decays
Aaij R and others, LHCb collaboration (2014), Search for CP violation using T-odd correlations in $D^0 \to K^+K^-π^+π^-$ decays, in JHEP, 10, 005.
Search for Majorana neutrinos in $B^- \to π^+μ^-μ^-$ decays
Aaij R and others, LHCb collaboration (2014), Search for Majorana neutrinos in $B^- \to π^+μ^-μ^-$ decays, in Phys. Rev. Lett., 112, 131802.
Searches for $\Lambda^0_b$ and $\Xi^0_b$ decays to $K^0_{\rm S} p π^-$ and $K^0_{\rm S}p K^-$ final states with first observation of the $\Lambda^0_b \to K^0_{\rm S}p π^-$ decay
Aaij R and others, LHCb collaboration (2014), Searches for $\Lambda^0_b$ and $\Xi^0_b$ decays to $K^0_{\rm S} p π^-$ and $K^0_{\rm S}p K^-$ final states with first observation of the $\Lambda^0_b \to K^0_{\rm S}p π^-$ decay, in JHEP, 04, 087.
Silicon Photomultipliers for the LHCb Upgrade Scintillating Fibre Tracker
Haefeli G and Xu Z, LHCb SiFi Tracker group (2014), Silicon Photomultipliers for the LHCb Upgrade Scintillating Fibre Tracker, in International Conference on Technology and Instrumentation in Particle Physics 2014 (TIPP 2014), Amsterdam, The NetherlandsProceedings of Science, web.
Study of $\Upsilon$ production and cold nuclear matter effects in $p$Pb collisions at $\sqrt{s_{NN}}=5$~TeV
Aaij R and others, LHCb collaboration (2014), Study of $\Upsilon$ production and cold nuclear matter effects in $p$Pb collisions at $\sqrt{s_{NN}}=5$~TeV, in JHEP, 07, 094.
Study of $çhi _b$ meson production in $pp$ collisions at $\sqrts=7$ and $8$~TeV and observation of the decay $çhi _b(3P) \to \Upsilon(3S)γ$
Aaij R and others, LHCb collaboration (2014), Study of $çhi _b$ meson production in $pp$ collisions at $\sqrts=7$ and $8$~TeV and observation of the decay $çhi _b(3P) \to \Upsilon(3S)γ$, in Eur. Phys. J. C, 74, 3092.
Study of beauty hadron decays into pairs of charm hadrons
Aaij R and others, LHCb collaboration (2014), Study of beauty hadron decays into pairs of charm hadrons, in Phys. Rev. Lett., 112, 202001.
Study of the kinematic dependences of $\Lambda_b^0$ production in $pp$ collisions and a measurement of the $\Lambda_b^0 \to \Lambda_c^+π^-$ branching fraction
Aaij R and others, LHCb collaboration (2014), Study of the kinematic dependences of $\Lambda_b^0$ production in $pp$ collisions and a measurement of the $\Lambda_b^0 \to \Lambda_c^+π^-$ branching fraction, in JHEP, 08, 143.
Test of lepton universality using $B^+\to K^+\ell^+\ell^-$ decays
Aaij R and others, LHCb collaboration (2014), Test of lepton universality using $B^+\to K^+\ell^+\ell^-$ decays, in Phys. Rev. Lett., 113, 151601.
The LHCb trigger system: Performance and outlook
Puig A, LHCb collaboration (2014), The LHCb trigger system: Performance and outlook, in 2013 IEEE Nuclear Science Symposium and Medical Imaging Conference (2013 NSS/MIC), Seoul, Rep. KoreaIEEE Xplore Digital Library, web.
The upgrade of the LHCb trigger system
Albrecht J Fitzpatrick C Gligorov V and Raven G (2014), The upgrade of the LHCb trigger system, in WIT2014 Workshop on Intellligent Trackers, Philadelphia, USAJournal of Instrumentation, web.
TORCH — an Innovative High-Precision Time-of-Flight PID Detector for the LHCb Upgrade
Fohl K Castillo García L and others (2014), TORCH — an Innovative High-Precision Time-of-Flight PID Detector for the LHCb Upgrade, in IEEE - 21st Symposium on Room-Temperature Semiconductor X-Ray and Gamma-Ray Detectors workshop, Seattle, USAIEEE, New York, USA.
Measurement of the $B_s^0 \to D_s^{(*)+}D_s^{(*)-}$ branching fractions
Aaij R and others, LHCb collaboration, Measurement of the $B_s^0 \to D_s^{(*)+}D_s^{(*)-}$ branching fractions, in to appear in Phys. Rev. , D.
Measurement of the difference of time-integrated CP asymmetries in $D^0 \to K^- K^+$ and $D^0 \to π^-π^+$ decays
Aaij R and others, LHCb collaboration, Measurement of the difference of time-integrated CP asymmetries in $D^0 \to K^- K^+$ and $D^0 \to π^-π^+$ decays, in to appear in Phys. Rev. Lett..
Measurement of the mass and lifetime of the $\Omega_b^-$ baryon
Aaij R and others, LHCb collaboration, Measurement of the mass and lifetime of the $\Omega_b^-$ baryon, in Phys. Rev., D.
Observations of $\Lambda_b^0 \to \Lambda K^+π^-$ and $\Lambda_b^0 \to \Lambda K^+K^-$ decays and searches for other $\Lambda_b^0$ and $\Xi_b^0$ decays to $\Lambda h^+h^{\prime -}$ final states
Aaij R and others, LHCb collaboration, Observations of $\Lambda_b^0 \to \Lambda K^+π^-$ and $\Lambda_b^0 \to \Lambda K^+K^-$ decays and searches for other $\Lambda_b^0$ and $\Xi_b^0$ decays to $\Lambda h^+h^{\prime -}$ final states, in to appear in JHEP.
Tesla : an application for real-time data analysis in High Energy Physics
Aaij R and others, Tesla : an application for real-time data analysis in High Energy Physics, in submitted to J. Comput. Phys..

Collaboration

Group / person Country
Types of collaboration
University of Zurich (UZH) Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
LHCb collaboration (69 institutions of 16 different countries) Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure

Scientific events

Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
30th Les Rencontres de Physique de la Vallée d'Aoste Results and Perspectives in Particle Physics Talk given at a conference b-flavour tagging in pp collisions at LHCb 06.03.2016 La Thuile (Aosta), Italy Battista Vincenzo;
LHC student poster session of the open session of the 125th LHCC meeting Poster Jet flavor tagging and top x-section at LHCb 02.03.2016 CERN Geneva, Switzerland Khurewathanakul Chitsanu;
LHC student poster session of the open session of the 125th LHCC meeting Poster LHCb measurements of J/ψ, and open charm cross-sections at s√=13TeV 02.03.2016 CERN Geneva, Switzerland Komarov Ilya Alexandrovich;
Seminar at Université Blaise Pascal, CNRS/IN2P3, LPC Individual talk LHCb tracking system: past, present and future 16.02.2016 Clermont-Ferrand, France Tobin Mark;
Data Science@LHC 2015 Workshop Talk given at a conference Data science at LHCb 09.11.2015 CERN Geneva, Switzerland Head Timothy Daniel;
Joint annual meeting of the Austrian Physical Society and the Swiss Physical Society Talk given at a conference Photon polarisation in Bs0 → φγ at LHCb 01.09.2015 Vienna, Austria Xu Zhirui;
Joint annual meeting of the Austrian Physical Society and the Swiss Physical Society Talk given at a conference Study of the rare Bs0 and B0 decays into the π+π−μ+μ− final state 01.09.2015 Vienna, Austria Komarov Ilya Alexandrovich;
The Third Annual Large Hadron Collider Physics Conference Talk given at a conference LHCb rare decays 31.08.2015 St. Petersburg, Russia Veneziano Giovanni;
Meeting of the Division of Particles and Fields of the American Physical Society (DPF 2015) Talk given at a conference Radiative B decays as probes of physics beyond the Standard Model (BSM) 04.08.2015 Ann Arbor, United States of America Xu Zhirui;
European Physical Society Conference on High Energy Physics (EPS-HEP 2015) Talk given at a conference Measurement of J∖ψ production cross-section in pp collisions at s√=13TeV at LHCb 22.07.2015 Vienna, Austria Komarov Ilya Alexandrovich;
2015 CHIPP Annual Plenary Meeting Talk given at a conference The LHCb upgrade 29.06.2015 Bogis-Bossey, Switzerland Head Timothy Daniel;
13th Pisa Meeting on Advanced Detectors Talk given at a conference The LHCb Turbo Stream 24.05.2015 La Biodola (Isola d'Elba), Italy Puig Navarro Albert;
13th Pisa Meeting on Advanced Detectors: Frontier Detectors for Frontier Physics Talk given at a conference LHCb Upgrade: Scintillating Fibre Tracker 24.05.2015 La Biodola (Isola d'Elba), Italy Tobin Mark;
13th Pisa Meeting on Advanced Detectors: Frontier Detectors for Frontier Physics Poster LHCb : Performance, radiation resistance, and expectations of the Outer Tracker straw 24.05.2015 La Biodola (Isola d'Elba), Italy Tobin Mark;
13th Pisa Meeting on Advanced Detectors: Frontier Detectors for Frontier Physics Poster LHCb : Novel real-time alignment and calibration of the LHCb Detector in Run2 24.05.2015 La Biodola (Isola d'Elba), Italy Tobin Mark; Xu Zhirui;
13th Pisa Meeting on Advanced Detectors Talk given at a conference Preparation and commissioning of LHCb for Run II of LHC 24.05.2015 La Biodola (Isola d'Elba), Italy Puig Navarro Albert;
Incontri di Fisica delle Alte Energie 2015 (IFAE 2015), Talk given at a conference Violazione di CP e misura di |Vub| tramite decadimenti semileptonici di adroni B a LHCb 08.04.2015 Roma, Italy Battista Vincenzo;
LHC student poster session of the open session of the 125th LHCC meeting Poster Study of the rare B0s and B0 decays into the π+π−μ+μ− final state at LHCb 04.03.2015 CERN Geneva, Switzerland Komarov Ilya Alexandrovich;
LHC student poster session of the open session of the 125th LHCC meeting Poster Search for Exotics with LHCb 04.03.2015 CERN Geneva, Switzerland Muster Bastien;
2015 CERN - Latin-American School of High-Energy Physics Poster Study of the rare B0s and B0 decays into the π+π−μ+μ− final state at LHCb 04.03.2015 Ibarra, Ecuador Komarov Ilya Alexandrovich;
Connecting The Dots 2015 Talk given at a conference Tracking in LHCb's 2020 HLT 09.02.2015 Berkeley, United States of America Head Timothy Daniel;
CHIPP PhD Winter School 2015 Talk given at a conference LHCb experiment: ST calibration and performance 18.01.2015 Grindelwald, Switzerland Battista Vincenzo;
CHIPP PhD Winter School 2015 Talk given at a conference Simulation studies and detectors characterization for the LHCb SciFi Tracker 18.01.2015 Grindelwald, Switzerland Gianì Sebastiana Maria Rita;
CHIPP PhD Winter School 2015 Talk given at a conference Search for the B 0 ( s ) ! decay at LHCb 18.01.2015 Grindelwald, Switzerland Komarov Ilya Alexandrovich;
CHIPP PhD Winter School 2015 Talk given at a conference Photon polarisation in b → sγ transition at LHCb 18.01.2015 Grindelwald, Switzerland Xu Zhirui;
Fourth Symposium on Prospects in the Physics of Discrete Symmetries, DISCRETE 2014 Talk given at a conference Rare decays at LHCb 02.12.2014 London, Great Britain and Northern Ireland Soomro Fatima;
20th Particles and Nuclei International Conference 2014 (PANIC 14) Talk given at a conference Rare Decays at LHCb 25.08.2014 Hamburg, Germany Soomro Fatima;
XI International Conference on Hyperons, Charm and Beauty Hadrons (BEACH 2014) Talk given at a conference Photon polarization in $b \to s \gamma$ transition at LHCb 21.07.2014 Birmingham, Great Britain and Northern Ireland Xu Zhirui;
15th International Conference on B-Physics at Frontier Machines (BEAUTY 2014) Talk given at a conference Radiative electroweak penguins at LHCb 14.07.2014 Edinburgh, Great Britain and Northern Ireland Puig Navarro Albert;
2014 CHIPP annual plenary meeting and PhD/postdoc days, 2014 annual meeting of the Swiss Physical Society Talk given at a conference Characterization of SiPM detector for LHCb upgrade 30.06.2014 Fribourg, Switzerland Xu Zhirui;
2014 CHIPP annual plenary meeting and PhD/postdoc days, 2014 annual meeting of the Swiss Physical Society Talk given at a conference Observation of photon polarization in the b → s transition 30.06.2014 Fribourg, Switzerland Veneziano Giovanni;
2014 CHIPP annual plenary meeting and PhD/postdoc days, 2014 annual meeting of the Swiss Physical Society Talk given at a conference Search for exotic particles in the LHCb experiment 30.06.2014 Fribourg, Switzerland Muster Bastien;
2014 CHIPP annual plenary meeting and PhD/postdoc days, 2014 annual meeting of the Swiss Physical Society Talk given at a conference Study of B0 → π+π−μ+μ− decays at LHCb 30.06.2014 Fribourg, Switzerland Komarov Ilya Alexandrovich;
2014 CHIPP annual plenary meeting and PhD/postdoc days, 2014 annual meeting of the Swiss Physical Society Talk given at a conference Charmless B decays at LHCb 30.06.2014 Fribourg, Switzerland Prisciandaro Jessica;
2014 CHIPP annual plenary meeting and PhD/postdoc days, 2014 annual meeting of the Swiss Physical Society Talk given at a conference A Scintillating Fibre Tracker for the LHCb Upgrade 30.06.2014 Fribourg, Switzerland Tobin Mark;
International Conference on Technology and Instrumentation in Particle Physics 2014 (TIPP 2014) Talk given at a conference Silicon Photomultipliers for the LHCb Upgrade Scintillating Fibre Tracker 02.06.2014 Amsterda,, Netherlands Xu Zhirui;
Workshop on ”Flavor of New Physics in b → s transitions” Talk given at a conference Photon polarization in B→Kππγ (Theory vs experiment) 02.06.2014 Paris, France Puig Navarro Albert;
12th Conference on Flavor Physics and CP Violation (FPCP 2014) Talk given at a conference LHCb upgrade 26.05.2014 Marseille, France Tobin Mark;
Phenomenology Symposium 2014 (PHENO 2014) Talk given at a conference Studies of charmless B decays at LHCb 05.05.2014 Pittsburgh (PA), United States of America Prisciandaro Jessica;


Communication with the public

Communication Title Media Place Year
Media relations: print media, online media "LHCb: tra bellezza e asimmetrie”, science popularization article Quaderni di scienza e scienziati molisani International 2015
New media (web, blogs, podcasts, news feeds etc.) (I. Komarov) On the irreversibility of time and Einstein’s theory Online lecture for children (“Scientists to kids” project), Moscow, Russia International 2015
New media (web, blogs, podcasts, news feeds etc.) EPFL contributes to breakthrough experiment at CERN EPFL News International 2015
New media (web, blogs, podcasts, news feeds etc.) First LHC run2 physics results: measurement of J/ψ prod. cross-sections in pp collisions at 13TeV LHCb public web site International 2015
Media relations: print media, online media LHCb improves trigger in Run 2 CERN Courier International 2015
Talks/events/exhibitions Round-table discussion C (F. Blanc) of the first Physics PhD Career Day Western Switzerland 2015
Talks/events/exhibitions Seminars on particle physics (M. Martinelli) targeted to an audience of high-school students Western Switzerland 2015
New media (web, blogs, podcasts, news feeds etc.) Tatsuya Nakada awarded Honorary Doctorate from University of Zurich EPFL News International 2015
Talks/events/exhibitions Visit at CERN (O. Schneider) for 60 Bachelor students of EPFL Western Switzerland 2015
Media relations: print media, online media "A tool that particle physicists dream of" (O. Schneider) Interview published in Horizons - the Swiss magazine for scientific research, No. 101 International 2014
Media relations: print media, online media "TASK and CHIPP plenary meeting" (O. Schneider) Communications of the Swiss Physical Society, Issue 44 Western Switzerland Italian-speaking Switzerland German-speaking Switzerland 2014
Media relations: print media, online media 60 ans CERN „Le CERN donne à la Suisse une image positive d'ouverture“ (O. Schneider) Sciences Naturelles Suisses International 2014
Talks/events/exhibitions Historical posters (O. Schneider and others) on the Swiss scientific contributions to CERN Italian-speaking Switzerland Rhaeto-Romanic Switzerland Western Switzerland German-speaking Switzerland 2014
Talks/events/exhibitions Invited talk (T. Nakada) “What the Higgs do we do now ?” EuroScience Open Forum International 2014
Media relations: print media, online media LHCb visit (C. Fitzpatrick) for and interview by BBC radio 4 BBC radio 4 International 2014
Talks/events/exhibitions Numerous visits organized and/or guided at CERN and/or LHCb for various categories of visitors International 2014
Media relations: print media, online media Polarisation confirmed CERN bulletin International 2014
Talks/events/exhibitions Teacher (T. Head) of the LHCb International Master classes at CERN International 2014
New media (web, blogs, podcasts, news feeds etc.) Unambiguous observation of an exotic particle which cannot be classified... LHCb public web site International 2014
Talks/events/exhibitions Visit at CERN (O. Schneider) to the LHCb and LHC magnets for 70 Bachelor students of EPFL Western Switzerland 2014
New media (web, blogs, podcasts, news feeds etc.) φs: CP violation in the Bs system — looking for a chink in the armour of the Standard Model LHCb public web site International 2014

Awards

Title Year
Honorary doctorate received from University of Zurich. 2015

Associated projects

Number Title Start Funding scheme
166208 High Precision CP Violation Physics at LHCb 01.04.2016 Project funding
154218 FLARE 2014-2015: Operation and upgrade of the LHCb experiment 01.04.2014 FLARE
147470 FLARE - GRID Infrastructure for LHC Experiments 01.04.2013 FLARE
147467 FLARE 2013: Operation and upgrade of the LHCb experiment 01.04.2013 FLARE
141096 High Precision CP Violation Physics at LHCb 01.04.2012 Project funding
147468 FLARE: Maintenance & Operation for the LHC Experiments 2013 01.04.2013 FLARE
146644 Experimental Particle Physics with the LHCb detector at Cern 01.04.2013 Project funding
141096 High Precision CP Violation Physics at LHCb 01.04.2012 Project funding
166915 FLARE 2016: Operation and upgrade of the LHCb experiment 01.04.2016 FLARE

Abstract

The LHCb detector is designed for precise measurements of CP violation andrare B decays, exploiting the very large bbbar production at CERN's LargeHadron Collider (LHC). The main physics aims are to characterize in detailthe flavour structure in the quark sector, and look for New Physics in thedecay of charm and bottom hadrons.During the first LHC running period (November 2009 - February 2013), LHCbhas efficiently recorded pp collisions at centre-of-mass energies up to 8TeV, corresponding to a total integrated luminosity of 3 fb^-1. With thesedata the LHCb physics programme is being deployed and reaching maturity.More than 150 physics papers have already been published or submitted topeer-reviewed journals. Although much new territory has been explored, allresults so far are consistent with the expectations of the Standard Model.After the current LHC shutdown (2013-2014), the experiment is expected tobe able to record pp collisions at 13 TeV for three more years (2015-2017),multiplying the number of b-hadron decays available for analysis by a factorof 3-4. In parallel, the collaboration is preparing a major upgrade ofthe experiment to enable the collection of 5 fb^-1 per year (2019 onwards)with improved efficiency.Our particle physics group in Lausanne has played important roles in LHCbsince the beginning of the project in 1995. Our detector construction andmaintenance responsibilities cover the so-called TELL1 common readout boards,the powering system and analogue transmission electronics for the siliconvertex detector VELO, and the downstream tracking stations (Inner Tracker)of the Silicon Tracker. In addition, Switzerland has significantly investedin the upstream tracking stations (through University of Zurich) and inthe online system, including the computer farm for the high-level triggerof the experiment. We are presently heavily involved in data analysis andin R&D studies in view of the upgrade of the downstream tracking stations,for which we have proposed a new technology based on scintillating fibresread out with silicon photomultipliers.Our objectives for the forthcoming two-year funding period 2014-2016 arethe following:- Maintain and improve the detector components under our responsibility toensure that they be fully operational at the start of the next LHC physicsrun scheduled in spring 2015.- Remain active on physics data analysis as well as physics resultsdissemination (publications and conference presentations) with main emphasison mixing-induced CP violation in B^0_s decays, studies of radiative andother charmless B decays, and direct New Physics searches.- Build prototype tracking detectors based on the scintillating-fibretechnology and gain operating experience in a realistic environment.- Finalize the design of the upgraded downstream tracking stations, andstart their construction.
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