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High Precision CP Violation Physics at LHCb

 English title High Precision CP Violation Physics at LHCb Schneider Olivier 141096 Project funding Laboratoire de physique des hautes énergies 2 EPFL - SB - IPEP - LPHE2 EPF Lausanne - EPFL Particle Physics 01.04.2012 - 31.03.2014 1'419'535.00
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Keywords (10)

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

Lay Summary (English)

Lay summary
The LHCb detector is designed for precise measurements of CP violation and rare B decays, exploiting a very large particle production at the LHC collider at CERN. The main physics aims are to elucidate the flavour structure in the quark sector, and look for New Physics manifestations in the decay of charm and bottom hadrons.

LHCb has successfully recorded the first proton-proton collisions since early 2010. Many physics measurements, including from key analyses of the LHCb physics programme, have already been published or made public. In March 2011 the LHCb collaboration submitted a Letter of Intent for the upgrade of the experiment to improve its efficiency.

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 stations (Inner Tracker) of the Silicon Tracker. The latter responsibility is assumed in collaboration with the group of Prof. U. Straumann at the University of Zurich. In addition, the two groups have taken a significant financial responsibility for the online system, including the computer farm for the high-level trigger of the experiment.
Our objectives for the forthcoming two-year period 2012–2014 are the following:

-  To operate, monitor, and maintain the hardware devices under our responsibility to keep them fully operational throughout the physics data-taking.

- To continue our significant contribution to the physics analysis of the data recorded, with emphasis on CP violation in B decays, spectroscopy of b baryons and exotic charmonium-like mesons, and direct New Physics searches.

- To take major responsibility in the R&D and design for the upgrade of the tracking stations, based on scintillating fibres read out with silicon photo-multipliers; this includes building prototype detectors to be used for tests or, if needed, as a replacement of existing Inner Tracker boxes.
 Direct link to Lay Summary Last update: 21.02.2013

Responsible applicant and co-applicants

Name Institute
 Schneider Olivier Laboratoire de physique des hautes énergies OS EPFL - SB - IPHYS - LPHE-OS
 Tran Minh Tâm Laboratoire de physique des hautes énergies 2 EPFL - SB - IPEP - LPHE2
 Nakada Tatsuya Laboratoire de physique des hautes énergies 2 EPFL - SB - IPEP - LPHE2
 Blanc Frédéric Laboratoire de physique des hautes énergies 2 EPFL - SB - IPEP - LPHE2
 Bay Aurelio Laboratoire de physique des hautes énergies 1 EPFL - SB - IPHYS - LPHE1

Employees

Name Institute
 Xu Zhirui Laboratoire de physique des hautes énergies LS EPFL - SB - IPHYS - LPHE-LS
 Komarov Ilya Alexandrovich Laboratoire de physique des hautes énergies LS EPFL - SB - IPHYS - LPHE-LS

Publications

Publication
Aaij R and others, LHCb collaboration (2014), A study of CP violation in $B^\pm \to D K^\pm$ and $B^\pm \to D π^\pm$ decays with $D \to K^0_{\rm S} K^\pm π^\mp$ final states, in Phys. Lett., B733, 36-45.
Märki R, LHCb collaboration (2014), b-baryon mass measurements at LHCb, in 27ème Rencontres de Physique de la Vallée d’Aoste, La Thuile, ItalyItalian Physical Society, Bologna, Italy.
Aaij R and others, LHCb collaboration (2014), Measurement of $\Upsilon$ production in $pp$ collisions at $\sqrts=2.76$ TeV, in Eur. Phys. J., C74, 2835-2835.
Aaij R and others, LHCb collaboration (2014), Measurement of CP violation in the phase space of $B^{\pm} \to K^+ K^- π^{\pm}$ and $B^{\pm} \to π^+ π^- π^{\pm}$ decays, in Phys. Rev. Lett., 112, 011801-011801.
Aaij R., others (2014), Measurement of the $\barB_s^0\to D_s^-D_s^+$ and $\barB_s^0\to D^-D_s^+$ effective lifetimes, in Phys. Rev. Lett., 112, 111802-111802.
Aaij R and others, LHCb collaboration (2014), Measurement of the $B_c^+$ meson lifetime using $B_c^+ \to J/ψμ^+ ν_{μ} X$ decays, in The Eur. Phys. J. C, (74), 2839.
Aaij R and others, LHCb collaboration (2014), Measurement of the charge asymmetry in $B^{\pm}\to ϕ K^{\pm}$ and search for $B^{\pm}\to ϕ π^{\pm}$ decays, in Phys. Lett., B728, 85-94.
Aaij R and others, LHCb collaboration (2014), Measurement of the flavour-specific CP-violating asymmetry $a_{\rm sl}^s$ in $B_s^0$ decays, in Phys. Lett. B, 728, 607-615.
Aaij R and others, LHCb collaboration (2014), Measurements of indirect CP asymmetries in $D^0\to K^-K^+$ and $D^0\toπ^-π^+$ decays, in Phys. Rev. Lett., 112, 041801-041801.
Aaij R and others, LHCb collaboration (2014), Measurements of the $B^+$, $B^0$, $B_s^0$ meson and $\Lambda_b^0$ baryon lifetimes, in JHEP, 1404, 114-114.
Aaij R and others, LHCb collaboration (2014), Observation of $\barB^0_{(s)} \to J/ψ f_1(1285)$ decays and measurement of the $f_1(1285)$ mixing angle, in Phys. Rev. Lett., 112, 091802-091802.
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, 1404, 091-091.
Aaij R and others, LHCb collaboration (2014), Observation of photon polarization in the $b \to sγ$ transition, in Phys. Rev. Lett., 112, 161801-161801.
Puig A, LHCb collaboration (2014), Radiative B decays at LHCb, in European Physical Society Conference on High Energy Physics (EPS-HEP 2013), Stockholm, SwedenProceedings of Science, SISSA, Trieste, Italy.
Aaij R and others, LHCb collaboration (2014), Search for CP violation in the decay $D^+ \to π^-π^+π^+$, in Phys. Lett., B728, 585-595.
Aaij R and others, LHCb collaboration (2014), Search for Majorana neutrinos in $B^- \to π^+μ^-μ^-$ decays, in Phys. Rev. Lett., 112, 131802-131802.
Aaij R and others, LHCb collaboration (2014), Search for the decay $D^0 \to π^+ π^- μ^+ μ^-$, in Phys. Lett., B728, 234-243.
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, 1404, 087-087.
Aaij R and others, LHCb collaboration (2014), Studies of beauty baryon decays to $D^0 p h^-$ and $\Lambda_c^+ h^-$ final states, in Phys. Rev., D89, 032001-032001.
Aaij R and others, LHCb collaboration (2014), Study of $J/ψ$ production and cold nuclear matter effects in $pPb$ collisions at $\sqrt{s_{NN}} = 5$ TeV, in JHEP, 1402, 072-072.
Aaij Roel, others (2014), Study of forward $Z + {\rm jet}$ production in $pp$ collisions at $\sqrts = 7$ TeV, in JHEP, 1401, 033-033.
Elsasser Ch. and others, LHCb Silicon Tracker group (2014), The LHCb Silicon Tracker, in Innovative Particle and Radiation Detectors (IPRD13), Sienna, ItalyIOP Publishing, Bristol, United Kingdom.
Aaij R and others, LHCb collaboration (2014), Updated measurements of exclusive $J/ψ$ and $ψ(2S)$ production cross-sections in $pp$ collisions at $\sqrts = 7$ TeV, in J. Phys., G41(5), 055002-055002.
Aaij R and others, LHCb collaboration (2013), A study of the Z production cross-section in pp collisions at sqrts = 7 TeV using tau final states, in JHEP, 1301, 111-111.
Aaij R and others, LHCb collaboration (2013), Amplitude analysis and branching fraction measurement of anti-B^0_s -> J/psi K^+K^-, in Phys. Rev., D87, 072004-072004.
Aaij R and others, LHCb collaboration (2013), Analysis of the resonant components in anti-B^0 -> J/psi pi+pi-, in Phys. Rev., D87, 052001-052001.
Amoraal J and others (2013), Application of vertex and mass constraints in track-based alignment, in Nucl.\ Instrum.\ Methods, A712, 48-55.
Aaij R and others, LHCb collaboration (2013), Branching fraction and CP asymmetry of the decays $B^+ \to K_{\rm S}^0 π^+$ and $B^+ \to K_{\rm S}^0 K^+$, in Phys. Lett., B726, 646-655.
Aaij R and others, LHCb collaboration (2013), Determination of the $X(3872)$ meson quantum numbers, in Phys. Rev. Lett., 110(22), 222001-222001.
Aaij R and others, LHCb collaboration (2013), Differential branching fraction and angular analysis of the B^+ -> K^+mu^+mu^- decay, in JHEP, 1302, 105-105.
Aaij R and others, LHCb collaboration (2013), Differential branching fraction and angular analysis of the decay $B^0 \to K^{*0} μ^+μ^-$, in JHEP, 1308, 131-131.
Aaij R and others, LHCb collaboration (2013), Differential branching fraction and angular analysis of the decay $B_s^0\toϕμ^+μ^-$, in JHEP, 1307, 084-084.
Tourneur S, LHCb collaboration (2013), Electroweak boson production at LHCb, in XXI International Workshop on Deep-Inelastic Scattering and Related Subjects (DIS 2013), Marseille, FranceProceedings of Science, SISSA, Trieste, Italy.
Aaij R and others, LHCb collaboration (2013), Evidence for the decay B^0 -> J/psi Omega and measurement of the relative branching fractions of B^0_s meson decays to J/psieta and J/psieta^{'}, in Nucl. Phys., B867, 547-566.
Aaij R and others, LHCb collaboration (2013), Exclusive J/psi and psi(2S) production in pp collisions at sqrts=7 TeV, in J. Phys., G40, 045001-045001.
Aaij R and others, LHCb collaboration (2013), First evidence for the annihilation decay mode B^+ -> D_s^+ phi, in JHEP, 1302, 043-043.
Aaij R and others, LHCb collaboration (2013), First evidence for the decay B^0_s -> mu^+ mu^-, in Phys. Rev. Lett., 110, 021801-021801.
Aaij R and others, LHCb collaboration (2013), First evidence for the two-body charmless baryonic decay $B^0 \to p \barp$, in JHEP, 1310, 005-005.
Aaij R and others, LHCb collaboration (2013), First measurement of the CP-violating phase in $B_s^0 \to ϕ ϕ$ decays, in Phys. Rev. Lett., 110, 241802-241802.
Aaij R and others, LHCb collaboration (2013), First measurement of time-dependent CP violation in $B^0_s \to K^+K^-$ decays, in JHEP, 1310, 183-183.
Aaij R and others, LHCb collaboration (2013), First observation of $\barB^0 \to J/ψ K^+K^-$ and search for $\barB^0 \to J/ψϕ$ decays, in Phys. Rev., D88, 072005-072005.
Aaij R and others, LHCb collaboration (2013), First observation of CP violation in the decays of $B^0_s$ mesons, in Phys. Rev. Lett., 110, 221601-221601.
Aaij R and others, LHCb collaboration (2013), First observation of the decay $B_c^+\to J/ψ K^+$, in JHEP, 1309, 075-075.
Aaij R, others (2013), First observation of the decay $B_s^0 \to ϕ \barK^{*0}$, in JHEP, 1311, 092-092.
Aaij R and others, LHCb collaboration (2013), First observation of the decay B_{s2}^*(5840)^0 -> B^{*+} K^- and studies of excited B^0_s mesons, in Phys. Rev. Lett., 110, 151803.
Aaij R and others, LHCb collaboration (2013), First observations of $\bar{B}_s^0\to D^+D^-$, $D_s^+D^-$ and $D^0\bar{D}^0$ decays, in Phys. Rev., D87, 092007.
Aaij R and others, LHCb collaboration (2013), Implications of LHCb measurements and future prospects, in Eur. Phys. J., C73, 2373-2373.
Aaij R and others, LHCb collaboration (2013), Limits on neutral Higgs boson production in the forward region in $pp$ collisions at $\sqrts = 7$ TeV, in JHEP, 1305, 132-132.
Aaij R and others, LHCb collaboration (2013), Measurement of $B$ meson production cross-sections in proton-proton collisions at $\sqrts = 7$ TeV, in JHEP, 1308, 117-117.
Aaij R and others, LHCb collaboration (2013), Measurement of $D^0-\barD^0$ mixing parameters and search for CP violation using $D^0\to K^+π^-$ decays, in Phys. Rev. Lett., 111, 251801-251801.
Aaij R and others, LHCb collaboration (2013), Measurement of $J/ψ$ polarization in $pp$ collisions at $\sqrts=7$ TeV, in Eur. Phys. J., C73, 2631-2631.
Aaij R and others, LHCb collaboration (2013), Measurement of CP observables in B^0 -> D K^{*0} with D -> K^+ K^-, in JHEP, 1303, 067-067.
Aaij R and others, LHCb collaboration (2013), Measurement of CP violation and the $B_s^0$ meson decay width difference with $B_s^0\to J/ψ K^+ K^-$ and $B_s^0\to J/ψπ^+π^-$ decays, in Phys. Rev., D87(11), 112010-112010.
Aaij R and others, LHCb collaboration (2013), Measurement of CP violation in the phase space of $B^{\pm} \to K^{\pm} π^+ π^-$ and $B^{\pm} \to K^{\pm} K^+ K^-$ decays, in Phys. Rev. Lett., 111, 101801-101801.
Aaij R and others, LHCb collaboration (2013), Measurement of form-factor independent observables in the decay $B^0 \to K^{*0} μ^+ μ^-$, in Phys. Rev. Lett., 111, 191801-191801.
Aaij R and others, LHCb collaboration (2013), Measurement of J/psi production in pp collisions at sqrts=2.76 TeV, in JHEP, 1302, 041-041.
Aaij R and others, LHCb collaboration (2013), Measurement of the $\Lambda_b^0$, $\Xi_b^-$ and $\Omega_b^-$ baryon masses, in Phys. Rev. Lett., 110, 182001-182001.
Aaij R and others, LHCb collaboration (2013), Measurement of the $B^0 \to K^{*0}e^+e^-$ branching fraction at low dilepton mass, in JHEP, 1305, 159-159.
Aaij R and others, LHCb collaboration (2013), Measurement of the $B^0_s \to μ^+ μ^-$ branching fraction and search for $B^0 \to μ^+ μ^-$ decays at the LHCb experiment, in Phys. Rev. Lett., 111, 101805-101805.
Aaij R and others, LHCb collaboration (2013), Measurement of the B^0-anti-B^0 oscillation frequency Delta m_d with the decays B^0 -> D^- pi^+ and B^0 -> J/psi K^{*0}, in Phys. Lett., B719, 318-325.
Aaij R and others, LHCb collaboration (2013), Measurement of the branching fractions of the decays $B^0_s \to \barD^0 K^- π^+$ and $B^0 \to \barD^0 K^+ π^-$, in Phys. Rev., D87, 112009-112009.
Aaij R and others, LHCb collaboration (2013), Measurement of the CKM angle $γ$ from a combination of $B^{\pm} \to Dh^{\pm}$ analyses, in Phys. Lett., B726, 151-163.
Aaij R and others, LHCb collaboration (2013), Measurement of the CP asymmetry in $B^+ \to K^+ μ^+ μ^-$ decays, in Phys. Rev. Lett., 111, 151801-151801.
Aaij R and others, LHCb collaboration (2013), Measurement of the CP asymmetry in B^0 -> K^{*0}mu^+mu^- decays, in Phys. Rev. Lett., 110, 031801-031801.
Aaij R and others, LHCb collaboration (2013), Measurement of the cross-section for Z -> e^+e^- production in pp collisions at sqrts=7 TeV, in JHEP, 1302, 106-106.
Aaij R and others, LHCb collaboration (2013), Measurement of the D^{+-} production asymmetry in 7 TeV pp collisions, in Phys. Lett., B718, 902-909.
Aaij R and others, LHCb collaboration (2013), Measurement of the differential branching fraction of the decay $\Lambda_b^0\to\Lambdaμ^+μ^-$, in Phys. Lett., B725, 25-35.
Aaij R and others, LHCb collaboration (2013), Measurement of the effective $B_s^0\to J/ψ K_{\mathrm S}^0$ lifetime, in Nucl. Phys., B873, 275-292.
Aaij R and others, LHCb collaboration (2013), Measurement of the forward energy flow in $pp$ collisions at $\sqrts=7$ TeV, in Eur. Phys. J., C73, 2421-2421.
Aaij R and others, LHCb collaboration (2013), Measurement of the fragmentation fraction ratio f_s/f_d and its dependence on B meson kinematics, in JHEP, 1304, 001-001.
Aaij R and others, LHCb collaboration (2013), Measurement of the polarization amplitudes in $B^0 \to J/ψ K^*(892)^0$ decays, in Phys. Rev., D88, 052002-052002.
Aaij R and others, LHCb collaboration (2013), Measurement of the ratio of branching fractions B(B^0 -> K^{*0} gamma)/B(B^0_s -> phi gamma) and the direct CP asymmetry in B^0 -> K^{*0} gamma, in Nucl. Phys., B867, 1-18.
Aaij R and others, LHCb collaboration (2013), Measurement of the relative rate of prompt $çhi_{c0}$, $çhi_{c1}$ and $çhi_{c2}$ production at $\sqrts=7$ TeV, in JHEP, 1310, 115-115.
Aaij R and others, LHCb collaboration (2013), Measurement of the time-dependent CP asymmetry in B^0 -> J/psi K_S^0 decays, in Phys. Lett., B721, 24-31.
Aaij R and others, LHCb collaboration (2013), Measurements of the $\Lambda_b^0 \to J/ψ \Lambda$ decay amplitudes and the $\Lambda_b^0$ polarisation in $pp$ collisions at $\sqrts = 7$ TeV, in Phys. Lett., B724, 27-27.
Aaij R and others, LHCb collaboration (2013), Measurements of the branching fractions of $B^+ \to p \barp K^+$ decays, in Eur. Phys. J., C73, 2462-2462.
Aaij R and others, LHCb collaboration (2013), Model-independent search for CP violation in $D^0 \to K^-K^+π^-π^+$ and $D^0 \to π^-π^+π^+π^-$ decays, in Phys. Lett., B726, 623-633.
Aaij R and others, LHCb collaboration (2013), Observation of $B^+_c \to J/ψ D_s^+$ and $B^+_c \to J/ψ D_s^{*+}$ decays, in Phys. Rev., D87, 112012-112012.
Aaij R and others, LHCb collaboration (2013), Observation of $B^0_s-\barB^0_s$ mixing and measurement of mixing frequencies using semileptonic $B$ decays, in Eur. Phys. J., C73, 2655-2655.
Aaij R and others, LHCb collaboration (2013), Observation of $B^0_s\toçhi_{c1}ϕ$ decay and study of $B^0\toçhi_{c1,2}K^{*0}$ decays, in Nucl. Phys., B874, 663-678.
Aaij R and others, LHCb collaboration (2013), Observation of a resonance in $B^+ \to K^+ μ^+μ^-$ decays at low recoil, in Phys. Rev. Lett., 111, 112003-112003.
Aaij R and others, LHCb collaboration (2013), Observation of D^0-anti-D^0 oscillations, in Phys. Rev. Lett., 110, 101802-101802.
Aaij R and others, LHCb collaboration (2013), Observation of the decay $B_c^+ \to B_s^0 π^+$, in Phys. Rev. Lett., 111, 181801-181801.
Aaij R and others, LHCb collaboration (2013), Observation of the decay $B_c^+ \to J/ψ K^+ K^- π^+$, in JHEP, 1311, 094-094.
Aaij R and others, LHCb collaboration (2013), Observation of the decay $B_s^0\to\barD^0ϕ$, in Phys. Lett., B727, 403-411.
Aaij R and others, LHCb collaboration (2013), Observation of the decay B_c^+ -> psi(2S)pi^+, in Phys. Rev., D87, 071103-071103.
Aaij R and others, LHCb collaboration (2013), Observation of the suppressed ADS modes $B^\pm \to [π^\pm K^\mp π^+π^-]_D K^\pm$ and $B^\pm \to [π^\pm K^\mp π^+π^-]_D π^\pm$, in Phys. Lett., B723, 44-53.
Aaij R and others, LHCb collaboration (2013), Observations of B^0_s -> psi(2S)eta and B^0_(s) -> psi(2S)pi^+pi^- decays, in Nucl. Phys., B871, 403-419.
Alves A A Jr and others (2013), Performance of the LHCb muon system, in JINST, 8, P02022-P02022.
Tobin M, LHCb collaboration (2013), Performance of the LHCb tracking detectors, in 21st International Workshop on Vertex Detectors, Jeju, KoreaProceedings of Science, SISSA, Trieste, Italy.
Aaij R and others, LHCb collaboration (2013), Precision measurement of $D$ meson mass differences, in JHEP, 1306, 065-065.
Aaij R and others, LHCb collaboration (2013), Precision measurement of the $\Lambda_b^0$ baryon lifetime, in Phys. Rev. Lett., 111, 102003-102003.
Aaij R and others, LHCb collaboration (2013), Precision measurement of the $B^0_s - \barB^0_s$ oscillation frequency with the decay $B^0_s \to D^-_s π^+$, in New J. Phys., 15, 053021-053021.
Aaij R and others, LHCb collaboration (2013), Production of $J/ψ$ and $\Upsilon$ mesons in $pp$ collisions at $\sqrts = 8$ TeV, in JHEP, 1306, 064-064.
Aaij R and others, LHCb collaboration (2013), Prompt charm production in pp collisions at sqrts=7 TeV, in Nucl. Phys., B871, 1-20.
Puig A, LHCb collaboration (2013), Rare beauty and charm decays at LHCb, in 2013 Kaon Physics International Conference, Ann Arbor (MI), USAProceedings of Science, SISSA, Trieste, Italy.
Aaij R and others, LHCb collaboration (2013), Search for $D^+_s \to π^+ μ^+ μ^-$ and $D^+_s \to π^- μ^+ μ^+$ decays, in Phys. Lett., B724, 203-212.
Aaij R and others, LHCb collaboration (2013), Search for CP violation in $D^+ \to ϕ π+$ and $D_s^+ \to K^0_S π^+$ decays, in JHEP, 1306, 112-112.
Aaij R and others, LHCb collaboration (2013), Search for direct CP violation in $D^0 \to h^- h^+$ modes using semileptonic $B$ decays, in Phys. Lett., B723, 33-43.
Aaij R and others, LHCb collaboration (2013), Search for rare $B^0_{(s)}\to μ^+ μ^- μ^+ μ^-$ decays, in Phys. Rev. Lett., 110, 211801-211801.
Aaij R and others, LHCb collaboration (2013), Search for the decay B_s^0 -> D^{*-+} pi^+-, in Phys. Rev., D87, 071101-071101.
Aaij R and others, LHCb collaboration (2013), Search for the doubly charmed baryon $\Xi_{cc}^+$, in JHEP, 1312, 090-090.
Aaij R and others, LHCb collaboration (2013), Search for the lepton-flavor violating decays $B^0_s \to e^{\pm}μ^{\mp}$ and $B^0 \to e^{\pm} μ^{\mp}$, in Phys. Rev. Lett., 111, 141801-141801.
Aaij R and others, LHCb collaboration (2013), Search for the rare decay $D^0 \to μ^+ μ^-$, in Phys. Lett., B725, 15-24.
Aaij R and others, LHCb collaboration (2013), Search for the rare decay K^0_S -> mu^+ mu^-, in JHEP, 1301, 090-090.
Aaij R and others, LHCb collaboration (2013), Searches for $B^0_{(s)} \to J/ψ p\barp$ and $B^+ \to J/ψ p\barpπ^+$ decays, in JHEP, 1309, 006-006.
Aaij R and others, LHCb collaboration (2013), Searches for violation of lepton flavour and baryon number in tau lepton decays at LHCb, in Phys. Lett., B724, 36-45.
Aaij R and others, LHCb collaboration (2013), Studies of the decays $B^+ \to p \barp h^+$ and observation of $B^+ \to \bar{\Lambda}(1520)p$, in Phys. Rev., D88, 052015-052015.
Aaij R and others, LHCb collaboration (2013), Study of $B^0 \to D^{*-} π^+ π^- π^+$ and $B^0 \to D^{*-} K^+ π^- π^+$ decays, in Phys. Rev., D87, 092001-092001.
Aaij R and others, LHCb collaboration (2013), Study of $B_{(s)}^0 \to K_{\rm S}^0 h^+ h^{\prime -}$ decays with first observation of $B_s^0 \to K_{\rm S}^0 K^{\pm} π^{\mp}$ and $B_s^0 \to K_{\rm S}^0 π^+ π^-$, in JHEP, 1310, 143-143.
Aaij R and others, LHCb collaboration (2013), Study of $D_J$ meson decays to $D^+π^-$, $D^0 π^+$ and $D^{*+}π^-$ final states in $pp$ collisions, in JHEP, 1309, 145-145.
Tobin M, LHCb Silicon Tracker Group (2013), The LHCb Silicon Tracker, in 13th Vienna Conference on Instrumentation, Vienna, AustriaElsevier, Amsterdam, Netherlands.
Elsassser Ch and others, LHCb collaboration (2013), The LHCb Silicon Tracker – Performance and radiation damage, in 9th International Conference on Radiation Effects on Semiconduc- tor Materials Detectors and Devices, Florence, ItalyElsevier, Amsterdam, Netherlands.
Adeva Bernard et al., LHCb Silicon Tracker group (2013), The LHCb Silicon Tracker: Running experience, in JINST 8, C02027 (2013) / Topical Workshop on Electronics for Particle Physics 2012 (TWEPP12), Oxford, UKIOP Publishing, Bristol, United Kingdom.
Aaij R and others (2013), The LHCb trigger and its performance in 2011, in JINST, 8, 04022-04022.
Aaij R and others, LHCb collaboration (2012), A model-independent Dalitz plot analysis of B^+- -> D K^+- with D -> K^0_S h^+h^- (h=pi, K) decays and constraints on the CKM angle gamma, in Phys. Lett., B718, 43-55.
Aaij R and others, LHCb collaboration (2012), Analysis of the resonant components in anti-B^0_s -> J/psipi^+pi^-, in Phys. Rev., D86, 052006-052006.
Amhis Yasmine (on behalf of the LHCb collaboration) (2012), CP violation in B^0_s mixing at LHCb, in PoS (HQL 2012) 034 / XIth International Conference on Heavy Quarks and Leptons, Prague, Czech RepublicProceedings of Science, SISSA, Trieste, Italy.
Aaij R and others, LHCb collaboration (2012), Determination of the sign of the decay width difference in the B^0_s system, in Phys. Rev. Lett., 108, 241801-241801.
Aaij R and others, LHCb collaboration (2012), Differential branching fraction and angular analysis of the decay B^0 -> K^{*0} mu^+ mu^-, in Phys. Rev. Lett., 108, 181806-181806.
Aaij R and others, LHCb collaboration (2012), First evidence of direct CP violation in charmless two-body decays of B^0_s mesons, in Phys. Rev. Lett., 108, 201601-201601.
Aaij R and others, LHCb collaboration (2012), First observation of anti-B^0_s -> J/psi f'_2(1525) in J/psi K^+K^- final states, in Phys. Rev. Lett., 108, 151801-151801.
Aaij R and others, LHCb collaboration (2012), First observation of the decay B^+ -> pi^+ mu^+ mu^-, in JHEP, 1212, 125-125.
Aaij R and others, LHCb collaboration (2012), First observation of the decay B_c^+ -> J/psi pi^+pi^-pi^+, in Phys. Rev. Lett., 108, 251802-251802.
Aaij R and others, LHCb collaboration (2012), First observation of the decays anti-B^0 -> D^+ K^- pi^+ pi^- and B^- -> D^0 K^- pi^+ pi^-, in Phys. Rev. Lett., 108, 161801-161801.
Aaij R and others, LHCb collaboration (2012), First observation of the decays anti-B^0_(s) -> D_s^+K^-pi^+pi^- and anti-B^0_s -> D_{s1}(2536)^+pi^-, in Phys. Rev., D86, 112005-112005.
Aaij R and others, LHCb collaboration (2012), Inclusive W and Z production in the forward region at sqrts = 7 TeV, in JHEP, 1206, 058-058.
Aaij R and others, LHCb collaboration (2012), Measurement of b-hadron branching fractions for two-body decays into charmless charged hadrons, in JHEP, 1210, 037-037.
Aaij R and others, LHCb collaboration (2012), Measurement of charged particle multiplicities in pp collisions at sqrts =7 TeV in the forward region, in Eur. Phys. J., C72, 1947-1947.
Aaij R and others, LHCb collaboration (2012), Measurement of mixing and CP violation parameters in two-body charm decays, in JHEP, 1204, 129-129.
Aaij R and others, LHCb collaboration (2012), Measurement of prompt hadron production ratios in pp collisions at sqrts = 0.9 and 7 TeV, in Eur. Phys. J., C72, 2168-2168.
Aaij R and others, LHCb collaboration (2012), Measurement of psi(2S) meson production in pp collisions at sqrt(s)=7 TeV, in Eur. Phys. J., C72, 2100-2100.
Aaij R and others, LHCb collaboration (2012), Measurement of relative branching fractions of B decays to psi(2S) and J/psi mesons, in Eur. Phys. J., C72, 2118-2118.
Aaij R and others, LHCb collaboration (2012), Measurement of the anti-B^0_s effective lifetime in the J/psi f_0(980) final state, in Phys. Rev. Lett., 109, 152002-152002.
Aaij R and others, LHCb collaboration (2012), Measurement of the B^+- production cross-section in pp collisions at sqrts=7 TeV, in JHEP, 1204, 093-093.
Aaij R and others, LHCb collaboration (2012), Measurement of the B^0_s -> J/psi K^{*0} branching fraction and angular amplitudes, in Phys. Rev., D86, 071102-071102.
Aaij R and others, LHCb collaboration (2012), Measurement of the B_s^0 -> J/psi K_S^0 branching fraction, in Phys. Lett., B713, 172-179.
Aaij R and others, LHCb collaboration (2012), Measurement of the CP-violating phase phi_s in anti-B^0_s -> J/psipi^+pi^- decays, in Phys. Lett., B713, 378-386.
Aaij R and others, LHCb collaboration (2012), Measurement of the cross-section ratio sigma(chi_{c2})/sigma(chi_{c1}) for prompt chi_c production at sqrts=7 TeV, in Phys. Lett., B714, 215-223.
Aaij R and others, LHCb collaboration (2012), Measurement of the D_s^+ - D_s^- production asymmetry in 7 TeV pp collisions, in Phys. Lett., B713, 186-195.
Aaij R and others, LHCb collaboration (2012), Measurement of the effective B_s^0 -> K^+ K^- lifetime, in Phys. Lett., B716, 393-400.
Aaij R and others, LHCb collaboration (2012), Measurement of the fraction of Upsilon(1S) originating from chi_b(1P) decays in pp collisions at sqrts = 7 TeV, in JHEP, 1211, 031-031.
Aaij R and others, LHCb collaboration (2012), Measurement of the isospin asymmetry in B -> K^{(*)}mu^+mu^- decays, in JHEP, 1207, 133-133.
Aaij R and others, LHCb collaboration (2012), Measurement of the polarization amplitudes and triple product asymmetries in the B_s^0 -> phi phi decay, in Phys. Lett., B713, 369-377.
Aaij R and others, LHCb collaboration (2012), Measurement of the ratio of branching fractions B(B^0 -> K^{*0} gamma)/B(B_s^0 -> phi gamma), in Phys. Rev., D85, 112013-112013.
Aaij R and others, LHCb collaboration (2012), Measurement of the ratio of prompt chi_c to J/psi production in pp collisions at sqrts=7 TeV, in Phys. Lett., B718, 431-440.
Aaij R and others, LHCb collaboration (2012), Measurement of Upsilon production in pp collisions at sqrts = 7 TeV, in Eur. Phys. J., C72, 2025-2025.
Aaij R and others, LHCb collaboration (2012), Measurements of B_c^+ production and mass with the B_c^+ -> J/psi pi^+ decay, in Phys. Rev. Lett., 109, 232001-232001.
Aaij R and others, LHCb collaboration (2012), Measurements of the branching fractions and CP asymmetries of B^+ -> J/psi pi^+ and B^+ -> psi(2S) pi^+ decays, in Phys. Rev., D85, 091105-091105.
Aaij R and others, LHCb collaboration (2012), Measurements of the branching fractions of the decays B^0_s -> D^{-+}_s K^{+-} and B^0_s -> D^-_s pi^+, in JHEP, 1206, 115-115.
Aaij R and others, LHCb collaboration (2012), Observation of CP violation in B^+- -> D K^+- decays, in Phys. Lett., B712, 203-212.
Aaij R and others, LHCb collaboration (2012), Observation of double charm production involving open charm in pp collisions at sqrts=7 TeV, in JHEP, 1206, 141-141.
Aaij R and others, LHCb collaboration (2012), Observation of excited Lambda_b^0 baryons, in Phys. Rev. Lett., 109, 172003-172003.
Aaij R and others, LHCb collaboration (2012), Observation of the decay B^0 -> anti-D^0 K^+ K^- and evidence for B^0_s -> anti-D^0 K^+ K^-, in Phys. Rev. Lett., 109, 131801-131801.
Aaij R and others, LHCb collaboration (2012), Observation of X(3872) production in pp collisions at sqrts= 7 TeV, in Eur. Phys. J., C72, 1972-1972.
Aaij R and others, LHCb collaboration (2012), Opposite-side flavour tagging of B mesons at the LHCb experiment, in Eur. Phys. J., C72, 2022-2022.
Luisier Johan (on behalf of the LHCb Silicon Tracker group) (2012), Performance of the LHCb Silicon Tracker detector in the LHC, in Phys. Procedia 37, 851 (2012) /2nd Int. Conf. on Technol. & Instrum. in Particle Physics (TIPP 2011), Chicago, USAElsevier, Amsterdam, Netherlands.
Aaij R and others, LHCb collaboration (2012), Search for the $X(4140)$ in $B^+\to J/ψϕ K^+$, in Phys. Rev., D85, 091103-091103.
Aaij R and others, LHCb collaboration (2012), Search for the X(4140) in B^+ -> J/psi phi K^+, in Phys. Rev., D85, 091103-091103.
Aaij R and others, LHCb collaboration (2012), Searches for Majorana neutrinos in B^- decays, in Phys. Rev., D85, 112004-112004.
Aaij R and others, LHCb collaboration (2012), Strong constraints on the rare decays B^0_s -> mu^+ mu^- and B^0 -> mu^+ mu^-, in Phys. Rev. Lett., 108, 231801-231801.
Aaij R and others, LHCb collaboration (2012), Study of D_{sJ} decays to D^+K^0_S and D^0 K^+ final states in pp collisions, in JHEP, 1210, 151-151.
Aaij R and others, LHCb collaboration, Angular analysis of charged and neutral $B \to K μ^+μ^-$ decays, in to appear in JHEP.
Aaij R and others, LHCb collaboration, Measurement of $ψ(2S)$ polarisation in $pp$ collisions at $\sqrts=7$ TeV, in to appear in Eur. Phys. J. C.
Aaij R and others, LHCb collaboration, Measurement of polarization amplitudes and CP asymmetries in $B^0 \to ϕ K^*(892)^0$, in to appear in JHEP.
Aaij R and others, LHCb collaboration, Measurement of resonant and CP components in $\barB_s^0\to J/ψ π^+π^-$ decays, in to appear in Phys. Rev. D.
Aaij R and others, LHCb collaboration, Study of beauty hadron decays into pairs of charm hadrons, in to appear in Phys. Rev. Lett..

Collaboration

Group / person Country
Types of collaboration
 LHCb collaboration at CERN (67 institutions of 16 different countries) Switzerland (Europe)
 - in-depth/constructive exchanges on approaches, methods or results- Publication- Research Infrastructure
 University of Zurich 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
 LHC seminar Talk given at a conference Observation of photon polarization in the b → sγ transition at LHCb 18.03.2014 CERN Geneva, Switzerland Veneziano Giovanni;
 LHC student poster session of the open session of the 117th LHCC meeting Poster Observation of photon polarization in B ± → K ± π ∓ π ± γ decays 05.03.2014 CERN Geneva, Switzerland Veneziano Giovanni;
 Lake Louise Winter Institute 2014 Talk given at a conference Testing the Standard Model with rare decays at LHCb 16.02.2014 Lake Louise (Alberta), Canada Veneziano Giovanni;
 19th International Symposium on Particles, Strings and Cosmology (PASCOS 2013) Talk given at a conference Studies of charmless B decays at LHCb 20.11.2013 Taipei, Taiwan Prisciandaro Jessica;
 Beyond Imagination of Future Science”, 2013 IEEE Nuclear Science Symposium and Medical Imaging Conference (2013 NSS/MIC) Talk given at a conference The LHCb trigger system – Performance and outlook 27.10.2013 Seoul, Korean Republic (South Korea) Puig Navarro Albert;
 13th International Conference on Meson-Nucleon Physics and the Structure of the Nucleon Talk given at a conference The LHCb upgrade; talk presented by Dr Barinjaka Rakotomiaramanana 30.09.2013 Rome, Italy Schneider Olivier;
 14th ICATPP Conference on Astroparticle, Particle, Space Physics and Detectors for Physics Applications Talk given at a conference Scintillating fibre trackers: recent developments and applications 23.09.2013 Como, Italy Blanc Frédéric;
 2nd CHIPP Workshop on Detector R&D Talk given at a conference LHCb upgrade – Scintillating Fiber Tracker; talk presented by Dr Guido Haefeli 12.09.2013 PSI Villigen, Switzerland Schneider Olivier;
 3rd Workshop on the Physics of Fundamental Symmetries and Interactions at low energies and the precision frontier (PSI 2013) Talk given at a conference CP violation and precision measurements at LHCb 08.09.2013 PSI Villigen, Switzerland Blanc Frédéric;
 21st International Conference on Supersymmetry and Unification of Fundamental Interactions (SUSY 2013) Talk given at a conference Direct searches for Higgs-like particles at LHCb – How can LHCb contribute to the direct search for New Physics? Talk presented by Dr Stéphane Tourneur 26.08.2013 Trieste, Italy Schneider Olivier;
 9th Rencontres du Vietnam “Windows on the Universe" Talk given at a conference b -hadron production and spectroscopy at LHCb; talk presented by Mr Raphael Märki 11.08.2013 Quy Nhon, Vietnam Schneider Olivier;
 9th Rencontres du Vietnam “Windows on the Universe" Talk given at a conference CP violation and rare decays in b - and c -quark sector 11.08.2013 Quy Nhon, Vietnam Nakada Tatsuya;
 European Physical Society Conference on High Energy Physics (EPS-HEP 2013) Talk given at a conference Radiative B decays at LHCb 18.07.2013 Stockholm, Sweden Puig Navarro Albert;
 41st SLAC Summer Institute Poster CP and up-down asymmetries in B ± → K ± π ∓ π ± γ decay 08.07.2013 Menlo Park (CA), United States of America Veneziano Giovanni; Schneider Olivier; Puig Navarro Albert;
 LHC Seminar Talk given at a conference Charged lepton flavor violation searches at LHCb 25.06.2013 CERN, Geneva, Switzerland Soomro Fatima;
 International Workshop on Higgs and Beyond the Standard Model Physics at LHC Talk given at a conference Searches for Higgs and Higgs-like particles at LHCb; talk presented by Dr Stéphane Tourneur 24.06.2013 Trieste, Italy Schneider Olivier;
 2013 CHIPP Annual plenary meeting Talk given at a conference Swiss involvement in the LHCb upgrade 24.06.2013 Sursee, Switzerland Schneider Olivier;
 Seminar at the University Blaise Pascal, Clermont-Ferrand Talk given at a conference A scintillating fibre tracker for the LHCb upgrade 23.05.2013 Clermont-Ferrand, France Blanc Frédéric;
 11th conference on Flavor Physics & CP Violation Talk given at a conference Studies of hadronic B decays at LHCb 19.05.2013 Buzios - Rio de Janeiro,, Brazil Lopez March Neus;
 2013 Kaon Physics International Conference Talk given at a conference Rare beauty and charm decays at LHCb 29.04.2013 Ann Arbor, USA, United States of America Puig Navarro Albert;
 XXI International Workshop on Deep-Inelastic Scattering and Related Subjects (DIS2013) Talk given at a conference Electroweak boson production at LHCb; talk presented by Dr Stéphane Tourneur 22.04.2013 Marseille, France, France Schneider Olivier;
 9th International Workshop on Heavy Quarkonium 2013 Talk given at a conference XYZ spectroscopy at LHCb 22.04.2013 Beijing, PR China, China Bressieux Joël;
 14th International Conference on B Physics at Hadron Machines (BEAUTY 2013) Talk given at a conference Measurement of the CP violating and mixing in Bs0 decays at LHCb 08.04.2013 Bologna, Italy, Italy Dupertuis Frédéric Guillaume;
 LHC students poster session of the 113th meeting of the LHC committee Poster Charmless B → 3-body decays at LHCb 13.03.2013 Geneva, Switzerland, Switzerland Prisciandaro Jessica;
 2013 Aspen Winter Conference on particle physics: Higgs Quo Vadis Talk given at a conference Toward direct searches for Higgs-like particles at LHCb 10.03.2013 Aspen (CO), USA, United States of America Bay Aurelio;
 27e Rencontres de Physique de la Vallée d'Aoste Talk given at a conference b -baryon mass measurements at LHCb; talk presented by Mr Raphael Märki 24.02.2013 La Thuile, Italy, Italy Schneider Olivier;
 LHC students poster session of the 113th meeting of the LHC committee Poster Measurement of the Λ0b, Ξ−b and Ω−b baryon masses / Poster presented by Raphael Märki 16.02.2013 CERN, Geneva, Switzerland Schneider Olivier;
 13th Vienna Conference on Instrumentation Talk given at a conference The LHCb Silicon Tracker 11.02.2013 Vienna, Austria, Austria Tobin Mark;
 CHIPP PhD Winter School 2013 Individual talk Study of B 0 s → f 0 ( → π + π − ) μ + μ − decay at LHCb 25.01.2013 Grindelwald, Switzerland, Switzerland Komarov Ilya Alexandrovich;
 7th International Workshop on the CKM Unitarity Triangle Talk given at a conference Prospects for time-dependent asymmetries at LHCb 28.09.2012 Cincinnati, USA, United States of America Dupertuis Frédéric Guillaume;
 2012 CHIPP Annual Plenary Meeting Talk given at a conference CP violation measurements at LHCb 13.09.2012 Karthause Ittingen, Switzerland, Switzerland Cowan Greig Alan;
 40th SLAC Summer Institute Poster Study of charmless B decay with the LHCb experiment 23.07.2012 Menlo Park (CA), USA, United States of America Prisciandaro Jessica;
 36th International Conference on High Energy Physics (ICHEP2012) Talk given at a conference Measurement of φ s at LHCb using B 0 s → J/ψφ and B 0 s → J/ψπ + π − 04.07.2012 Melbourne, Australia, Australia Cowan Greig Alan;
 36th International Conference on High Energy Physics (ICHEP2012) Talk given at a conference Heavy flavour spectroscopy at LHCb / talk presented by Raphael Märki 04.07.2012 Melbourne, Australia Schneider Olivier;
 2012 annual meeting of the Swiss Physical Society Talk given at a conference b-baryon results at LHCb / talk presented by Rapahel Märki 21.06.2012 Zurich, Switzerland Schneider Olivier;
 2012 annual meeting of the Swiss Physical Society Talk given at a conference Tagged time-dependent angular analysis of B 0 s → J/ψφ decays at LHCb 21.06.2012 Zürich, Switzerland, Switzerland Dupertuis Frédéric Guillaume;
 XIth International Conference on Heavy Quarks and Leptons 2012 Talk given at a conference Measurement(s) of φ s at LHCb; talk presented by Dr Y. Amhis 11.06.2012 Prague, Czech Republic, Czech Republic Schneider Olivier;
 1st International Conference on New Frontiers in Physics (ICFP 2012) Talk given at a conference Mixing and CP violation in the B and D decays at LHCb 10.06.2012 Kolymbari, Crete, Greece, Greece Lopez March Neus;
 11th Conference on the Intersections of Particle and Nuclear Physics (CIPANP) Talk given at a conference Results on hadron spectroscopy at LHCb 29.05.2012 St. Petersburg (FL), USA, United States of America Bressieux Joël;

Self-organised

Title Date Place
 Workshop on B 0 s → φγ and other radiative decays at LHCb; organized by Dr Albert Puig Navarro 19.02.2014 Valencia, Spain
 Workshop on Implications of LHCb Measurements and Future Prospects; organization of the "Rare decays" session by Dr Fatima Soomro and Dr Albert Puig Navarro 14.10.2013 CERN Geneva, Switzerland
 Workshop on Implications of LHCb Measurements and Future Prospects; organization of the "Forward exotica" session by Dr Stéphane Tourneur 14.10.2013 CERN Geneva, Switzerland

Communication with the public

Communication Title Media Place Year
 Media relations: print media, online media Beauty-quark decays reveal photon polarization CERN courrier International 2014
 New media (web, blogs, podcasts, news feeds etc.) Des photons testent les limites du Modle standard EPFL home page news International 2014
 New media (web, blogs, podcasts, news feeds etc.) First observation of photon polarisation in b → sγ transition LHCb public web site International 2014
 Media relations: print media, online media Polarisation confirmed / Polarisation confirmée CERN bulletin International 2014
 New media (web, blogs, podcasts, news feeds etc.) Quirky photons spin out of the Standard Model EPFL home page news International 2014
 New media (web, blogs, podcasts, news feeds etc.) Unambiguous observation of an exotic particle which cannot be classified within the trad.quark model LHCb public web site International 2014
 Talks/events/exhibitions Visit organized at CERN/LHCb, January 7, 2014 (for EPFL Office of International Relations Western Switzerland 2014
 Talks/events/exhibitions "La physique des hautes énergies, plus c'est haut plus c'est...", conf. Foyer paroissial St. Sulpice Western Switzerland 2013
 Talks/events/exhibitions "Le boson de Higgs", café scientifique de la Faculté de Biologie et de Médecine, UNIL Western Switzerland 2013
 Other activities Construction of a cosmic ray detector for two student projects (travaux de maturité) Western Switzerland 2013
 New media (web, blogs, podcasts, news feeds etc.) First evidence of photon polarisation in b → sγ transition LHCb public web site International 2013
 New media (web, blogs, podcasts, news feeds etc.) Precise search for new physics Public web page of LHCb experiment International 2013
 Talks/events/exhibitions Public lecture and visit at LHCb (CERN) for the "Jeune chambre économique de Lausanne" Western Switzerland 2013
 Talks/events/exhibitions Several visits organized and guided at CERN/LHCb by different members of LPHE scientific staff Western Switzerland 2013
 New media (web, blogs, podcasts, news feeds etc.) Visit organized at CERN for high-school students from the Gymnase de Provence, Lausanne Western Switzerland 2013
 Talks/events/exhibitions "L'expérience LHCb au CERN", presentation/discussion with group of "Schweizerische Studienstiftung" German-speaking Switzerland Western Switzerland 2012
 Talks/events/exhibitions Visit organized at CERN (Globe, Microcosm) for teenagers from the region of Granges-près-Marnand Western Switzerland 2012

Associated projects

Number Title Start Funding scheme
 134940 FORCE 2011: High Precision CP Violation Physics at LHCb 01.07.2011 FORCE / CERN
 130202 High Precision CP Violation Physics at LHCb 01.04.2010 Project funding
 154218 FLARE 2014-2015: Operation and upgrade of the LHCb experiment 01.04.2014 FLARE
 135188 FORCE 2011: Construction of the LHCb experiment 01.04.2011 FORCE / CERN
 152784 High Precision CP Violation Physics at LHCb 01.04.2014 Project funding
 152784 High Precision CP Violation Physics at LHCb 01.04.2014 Project funding
 127479 Particle Physics in the LHC Era 01.03.2010 ProDoc
 135453 Experimental Particle Physics at the LHC 01.04.2011 Project funding
 134622 FORCE - GRID Infrastructure for LHC Experiments 01.04.2011 FORCE / CERN
 135989 FORCE 2010: Maintenance & Operation for the LHC Experiments 2011 01.04.2011 FORCE / CERN
 147467 FLARE 2013: Operation and upgrade of the LHCb experiment 01.04.2013 FLARE

Abstract

The LHCb detector is designed for precise measurements of CP violation and rare B decays, exploiting the very large bottom hadron production at the LHC collider at CERN. The main physics aims are to elucidate the flavour structure in the quark sector, and look for New Physics manifestations in the decay of charm and bottom hadrons.LHCb has successfully recorded the first pp collisions at 0.9 TeV at the end of 2009, and higher energy collisions at 7 TeV since Spring 2010. So far a total integrated luminosity of 0.9/fb has been collected. Many physics measurements, including from key analyses of the LHCb physics programme, have already been published or made public. In March 2011, the LHCb collaboration submitted a Letter of Intent for the upgrade of the experiment, to take place after an integrated luminosity of more than 5/fb has been accumulated, and to enable the collection of ~ 5/fb per year with improved efficiency.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 stations (Inner Tracker) of the Silicon Tracker. The latter responsibility is assumed in collaboration with the group of Prof. U. Straumann at the University of Zurich. In addition, the two groups have taken a significant financial responsibility for the online system, including the computer farm for the high-level trigger of the experiment. We have obtained, in 2010 and 2011, several physics analysis results, including a first measurement of a CP-violating observable in Bs -> J/psi phi decays which represent a significant improvement on previous determinations.Our objectives for the forthcoming two-year period 2012-2014 are the following:- Operate, monitor, and maintain the hardware devices under our responsibility to keep them fully operational throughout the physics data-taking at 7 TeV.- Continue to contribute significantly to the physics analysis of the data recorded at 7 TeV, with emphasis on CP violation in B decays, spectroscopy of b baryons and exotic charmonium-like mesons, and direct New Physics searches.- Take major responsibility in the R&D and design effort for the upgrade of the tracking stations, based on scintillating fibres read out with silicon photo-multipliers; this includes building prototype detectors to be used for tests or, if needed, as a replacement of existing Inner Tracker boxes.
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