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Particle Physics in the LHC Era

English title Particle Physics in the LHC Era
Applicant Schneider Olivier
Number 127479
Funding scheme ProDoc
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 01.03.2010 - 28.02.2013
Approved amount 320'923.00
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Keywords (10)

heavy flavour; CP violation; standard model; new physics; LHC; LHCb; b quark; b hadron; b baryon spectroscopy; Bs mixing

Lay Summary (English)

Lead
Lay summary
The LHCb experiment is designed for precise measurements of CP violation and rare B decays, exploiting the very large bb production cross section at the LHC collider at CERN. LHCb's main physics aims are to elucidate the flavour structure in the quark sector, and hopefully observe signals from New Physics.

Our research group has worked on LHCb since the beginning of the project in 1995, playing important roles in the leadership of the experiment. We have fulfilled our construction responsibilities, which included the development, construction and commissioning of the common readout board TELL1, of electronics and transmission lines for the silicon vertex detector VELO, of the silicon Inner Tracker detector, as well as a contribution to the DAQ and high-level trigger hardware.

The LHCb detector is now fully constructed and installed. It has already recorded first low-energy LHC collisions at the end of 2009. The commissioning, calibration and alignment of the detector are well underway and will be completed before the 2010 physics run. The physics program will be deployed after the LHC reaches a center-of-mass energy in excess of 4 TeV and a luminosity of the order of 10^32 cm^-2 s^-1.

During the period covered by this grant (3 years from March 1, 2010), we plan to reach quickly a stable physics operation regime. Our main objectives are the smooth operation and maintenance of the hardware components under our responsibility, the participation in general collaboration tasks such as physics data taking, and, last but not least, data analysis in view of the publication of physics results. This ProDoc training module entitled "Particle physics in the LHC era" provides funds to support two PhD students who will work on the following physics topics, using the LHCb data collected in the years 2010 and 2011:
1) measurement of the CP-violating phase in B0s -> J/psi phi decays;
2) search for new b baryons and measurement of their masses, lifetimes and production rates.
Direct link to Lay Summary Last update: 21.02.2013

Responsible applicant and co-applicants

Employees

Publications

Publication
A study of the Z production cross-section in pp collisions at s√=7TeV using tau final states
Aaij R. et al., LHCb collaboration (2013), A study of the Z production cross-section in pp collisions at s√=7TeV using tau final states, in JHEP, 2013(1), 111.
Amplitude analysis and branching fraction measurement of Bs->J/ψK+K-
Aaij R. et al., LHCb collaboration (2013), Amplitude analysis and branching fraction measurement of Bs->J/ψK+K-, in Phys. Rev., D87, 072004.
Analysis of the resonant components in B 0→J/ψπ+π-
Aaij R. et al., LHCb collaboration (2013), Analysis of the resonant components in B 0→J/ψπ+π-, in Phys.Rev., D87, 052001.
Application of vertex and mass constraints in track-based alignment
Amoraal J. and others (2013), Application of vertex and mass constraints in track-based alignment, in Nucl. Instrum. Methods, A712, 48-55.
Differential branching fraction and angular analysis of the $B^{+} \rightarrow K^{+}\mu^{+}\mu^{-}$ decay
Aaij R. et al., LHCb collaboration (2013), Differential branching fraction and angular analysis of the $B^{+} \rightarrow K^{+}\mu^{+}\mu^{-}$ decay, in JHEP 02, 2013, 105.
Exclusive J/ψ and ψ(2S) production in pp collisions at $\protect \sqrt{s} = 7$ TeV
Aaij R. et al., LHCb collaboration (2013), Exclusive J/ψ and ψ(2S) production in pp collisions at $\protect \sqrt{s} = 7$ TeV, in Journal of Physics G, 40(4), 045001.
First evidence for the annihilation decay mode $B^{+} \to D_{s}^{+} \phi$
Aaij R. et al., LHCb collaboration (2013), First evidence for the annihilation decay mode $B^{+} \to D_{s}^{+} \phi$, in JHEP 02, 02, 043.
First evidence for the decay Bs -> mu+ mu-
Aaij R. et al., LHCb collaboration (2013), First evidence for the decay Bs -> mu+ mu-, in Phys.Rev.Lett., 110, 021801.
Measurement of CP observables in B 0 → DK ∗0 with D →K + K −
Aaij R. et al., LHCb collaboration (2013), Measurement of CP observables in B 0 → DK ∗0 with D →K + K −, in JHEP, 1303, 067.
Measurement of J/ψ production in pp collisions at s√=2.76TeV
Aaij R. et al., LHCb collaboration (2013), Measurement of J/ψ production in pp collisions at s√=2.76TeV, in JHEP, 1302, 041.
Measurement of the $B^0$--$\bar B^0$ oscillation frequency $Δm_d$ with the decays $B^0 \to D^- π^+$ and $B^0 \to J/ ψK^{*0}$
Aaij R. et al., LHCb collaboration (2013), Measurement of the $B^0$--$\bar B^0$ oscillation frequency $Δm_d$ with the decays $B^0 \to D^- π^+$ and $B^0 \to J/ ψK^{*0}$, in Phys.Lett. B, 719(4-5), 318-325.
Measurement of the CP Asymmetry in B0→K*0μ+μ- Decays
Aaij R. et al., LHCb collaboration (2013), Measurement of the CP Asymmetry in B0→K*0μ+μ- Decays, in Phys.Rev.Lett., 110, 031801.
Measurement of the cross-section for Z->e+e- production in pp collisions at sqrt{s}=7TeV
Aaij R. et al., LHCb collaboration (2013), Measurement of the cross-section for Z->e+e- production in pp collisions at sqrt{s}=7TeV, in JHEP, 02, 106.
Measurement of the D+/- production asymmetry in 7 TeV pp collisions
Aaij R. et al., LHCb collaboration (2013), Measurement of the D+/- production asymmetry in 7 TeV pp collisions, in Phys.Lett. B, 718(3), 902-907.
Measurement of the fragmentation fraction ratio $f_{s}/f_{d}$ and its dependence on $B$ meson kinematics
Aaij R. et al., LHCb collaboration (2013), Measurement of the fragmentation fraction ratio $f_{s}/f_{d}$ and its dependence on $B$ meson kinematics, in JHEP, 04, 001.
Measurement of the ratio of branching fractions View the MathML source and the direct CP asymmetry in B0→K⁎0γ
Aaij R. et al., LHCb collaboration (2013), Measurement of the ratio of branching fractions View the MathML source and the direct CP asymmetry in B0→K⁎0γ, in Nucl.Phys. , Section B(867), 1-18.
Measurement of the time-dependent CP asymmetry in B0 -> J/ψ KS0 decays
Aaij R. et al., LHCb collaboration (2013), Measurement of the time-dependent CP asymmetry in B0 -> J/ψ KS0 decays, in Phys.Lett. B, 721(1-3), 24-31.
Observation of D0-D 0 Oscillations
Aaij R. et al., LHCb collaboration (2013), Observation of D0-D 0 Oscillations, in Phys.Rev.Lett., 110(10), 101802.
Observations of $B^0_s \rightarrowψ(2S)η$ and $B^0_{(s)}\rightarrowψ(2S)π^+π^-$ decays
Aaij R. et al., LHCb collaboration (2013), Observations of $B^0_s \rightarrowψ(2S)η$ and $B^0_{(s)}\rightarrowψ(2S)π^+π^-$ decays, in Nucl.Phys., B871, 403-419.
Prompt charm production in pp collisions at sqrt(s)=7 TeV
Aaij R. et al., LHCb collaboration (2013), Prompt charm production in pp collisions at sqrt(s)=7 TeV, in Nucl.Phys., Section B(871), 1-20.
Search for the rare decay KS -> mu+ mu-
Aaij R. et al., LHCb collaboration (2013), Search for the rare decay KS -> mu+ mu-, in JHEP 01, 2013, 090.
A model-independent Dalitz plot analysis of $B^\pm \to D K^\pm$ with $D \to K^0_{\rm S} h^+h^-$ ($h=π, K$) decays and constraints on the CKM angle $γ$
Aaij R. et al., LHCb collaboration (2012), A model-independent Dalitz plot analysis of $B^\pm \to D K^\pm$ with $D \to K^0_{\rm S} h^+h^-$ ($h=π, K$) decays and constraints on the CKM angle $γ$, in Phys.Lett. B, 718, 43-55.
Analysis of the resonant components in Bs->J/ψπ+π-
Aaij R. et al., LHCb collaboration (2012), Analysis of the resonant components in Bs->J/ψπ+π-, in Phys.Rev. D, 86(5), 052006.
Determination of the sign of the decay width difference in the $B^0_s$ system
Aaij R. et al., LHCb collaboration (2012), Determination of the sign of the decay width difference in the $B^0_s$ system, in Phys. Rev. Lett., 108, 241801.
Evidence for CP violation in time-integrated $D^0 \to h^-h^+$ decay rates
Aaij R. et al., LHCb collaboration (2012), Evidence for CP violation in time-integrated $D^0 \to h^-h^+$ decay rates, in Phys.Rev.Lett., 108, 111602.
Evidence for the decay $B^0\to J/ψω$ and measurement of the relative branching fractions of $B^0_s$ meson decays to $J/ψη$ and $J/ψη^{'}$
Aaij R. et al., LHCb collaboration (2012), Evidence for the decay $B^0\to J/ψω$ and measurement of the relative branching fractions of $B^0_s$ meson decays to $J/ψη$ and $J/ψη^{'}$, in Nucl.Phys. B, 867, 547-566.
First evidence of direct CP violation in charmless two-body decays of $B^0_s$ mesons
Aaij R. et al., 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.
First observation of $\barB^0_s \to J/\psi f'_2(1525)$ in $J/\psi K^+K^-$ final states
Aaij R. et al., LHCb collaboration (2012), First observation of $\barB^0_s \to J/\psi f'_2(1525)$ in $J/\psi K^+K^-$ final states, in Phys. Rev. Lett., 108, 151801.
First observation of the decay $B^0_s \to K^{*0} \barK^{*0}$
Aaij R. et al., LHCb collaboration (2012), First observation of the decay $B^0_s \to K^{*0} \barK^{*0}$, in Phys. Lett., B709, 50-58.
First observation of the decay B + → π + μ + μ −
Aaij R. et al., LHCb collaboration (2012), First observation of the decay B + → π + μ + μ −, in JHEP, 2012, 125.
First observation of the decay Bc+ to J/psi pi+pi-pi+
Aaij R. et al., LHCb collaboration (2012), First observation of the decay Bc+ to J/psi pi+pi-pi+, in Phys.Rev.Lett., 108(25), 251802.
First observation of the decays $\barB^0 \to D^+ K^-\pi^+\pi^-$ and $B^- \to D^0 K^-\pi^+\pi^-$
Aaij R. et al., LHCb collaboration (2012), First observation of the decays $\barB^0 \to D^+ K^-\pi^+\pi^-$ and $B^- \to D^0 K^-\pi^+\pi^-$, in Phys. Rev. Lett., 108, 161801.
First observation of the decays B (s)0→Ds+K-π+π- and B s0→Ds1(2536)+π-
Aaij R. et al., LHCb collaboration (2012), First observation of the decays B (s)0→Ds+K-π+π- and B s0→Ds1(2536)+π-, in Phys.Rev. D, 86, 112005.
Inclusive $W$ and $Z$ production in the forward region at $\sqrt{s} = 7$ TeV
Aaij R. et al., LHCb collaboration (2012), Inclusive $W$ and $Z$ production in the forward region at $\sqrt{s} = 7$ TeV, in JHEP, 2012(6), 58.
Measurement of $\Upsilon$ production in $pp$ collisions at $\sqrts = 7$ TeV
Aaij R. et al., LHCb collaboration (2012), Measurement of $\Upsilon$ production in $pp$ collisions at $\sqrts = 7$ TeV, in Eur. Phys. J., C 72, 2025.
Measurement of $b$ hadron production fractions in 7 TeV $pp$ collisions
Aaij R. et al., LHCb collaboration (2012), Measurement of $b$ hadron production fractions in 7 TeV $pp$ collisions, in Phys. Rev., D85, 032008.
Measurement of $b$-hadron branching fractions for two-body decays into charmless charged hadrons
Aaij R. et al., LHCb collaboration (2012), Measurement of $b$-hadron branching fractions for two-body decays into charmless charged hadrons, in JHEP, 2012(10), 37.
Measurement of $b$-hadron masses
Aaij R. et al., LHCb collaboration (2012), Measurement of $b$-hadron masses, in Phys. Lett., B708, 241-248.
Measurement of prompt hadron production ratios in $pp$ collisions at $\sqrt{s} = $ 0.9 and 7 TeV
Aaij R. et al., LHCb collaboration (2012), Measurement of prompt hadron production ratios in $pp$ collisions at $\sqrt{s} = $ 0.9 and 7 TeV, in Eur. Phys. J., C72, 2168.
Measurement of psi(2S) meson production in pp collisions at sqrt(s)=7 TeV
Aaij R. et al., LHCb collaboration (2012), Measurement of psi(2S) meson production in pp collisions at sqrt(s)=7 TeV, in The European Physical Journal C, 72, 2100.
Measurement of relative branching fractions of B decays to $ψ(2S)$ and $J/ψ$ mesons
Aaij R. et al., LHCb collaboration (2012), Measurement of relative branching fractions of B decays to $ψ(2S)$ and $J/ψ$ mesons, in Eur.Phys.J. C, 72, 2118.
Measurement of the $B^\pm$ production cross-section in $pp$ collisions at $\sqrts=7$ TeV
Aaij R. et al., LHCb collaboration (2012), Measurement of the $B^\pm$ production cross-section in $pp$ collisions at $\sqrts=7$ TeV, in J. High Energy Phys., 1204, 093.
Measurement of the $B^0_s\rightarrow J/ψK^{*0}$ branching fraction and angular amplitudes
Aaij R. et al., LHCb collaboration (2012), Measurement of the $B^0_s\rightarrow J/ψK^{*0}$ branching fraction and angular amplitudes, in Phys.Rev. D, 86(7), 071102.
Measurement of the $B_s^0\to J/ψK_S^0$ branching fraction
Aaij R. et al., LHCb collaboration (2012), Measurement of the $B_s^0\to J/ψK_S^0$ branching fraction, in Phys. Lett., B713, 172-179.
Measurement of the Bs effective lifetime in the J/psi f0(980) final state
Aaij R. et al. (2012), Measurement of the Bs effective lifetime in the J/psi f0(980) final state, in Phys.Rev.Lett., 109(15), 152002.
Measurement of the CP violating phase $\phi_s$ in $\barB^0_s \to J/psi f_0(980)$
Aaij R. et al., LHCb collaboration (2012), Measurement of the CP violating phase $\phi_s$ in $\barB^0_s \to J/psi f_0(980)$, in Phys. Lett., B707, 497-505.
Measurement of the CP-violating phase $\phi_s$ in the decay $B^0_s \to J/\psi\phi$
Aaij R. et al., LHCb collaboration (2012), Measurement of the CP-violating phase $\phi_s$ in the decay $B^0_s \to J/\psi\phi$, in Phys. Rev. Lett., 108, 101803.
Measurement of the CP-violating phase φs in Bs->J/ψπ+π- decays
Aaij R. et al., LHCb collaboration (2012), Measurement of the CP-violating phase φs in Bs->J/ψπ+π- decays, in Phys.Lett. B, 713(4-5), 378-386.
Measurement of the cross-section ratio $\sigma(\chi_{c2})/sigma(\chi_{c1})$ for prompt $\chi_c$ production at $\sqrts=7$ TeV
Aaij R. et al., 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., B 714, 215-223.
Measurement of the Ds+ - Ds- production asymmetry in 7 TeV pp collisions
Aaij R. et al., LHCb collaboration (2012), Measurement of the Ds+ - Ds- production asymmetry in 7 TeV pp collisions, in Phys.Lett. B, 713(3), 186-195.
Measurement of the effective $B^0_s \to K^+K^-$ lifetime
Aaij R. et al., LHCb collaboration (2012), Measurement of the effective $B^0_s \to K^+K^-$ lifetime, in Phys. Lett., B707, 349-356.
Measurement of the effective $B_s^0 \rightarrow K^+ K^-$ lifetime
Aaij R. et al., LHCb collaboration (2012), Measurement of the effective $B_s^0 \rightarrow K^+ K^-$ lifetime, in Phys.Lett. B, 716, 393-400.
Measurement of the fraction of Υ (1S) originating from χb(1P) decays in pp collisions at s√=7TeV
Aaij R. et al., LHCb collaboration (2012), Measurement of the fraction of Υ (1S) originating from χb(1P) decays in pp collisions at s√=7TeV, in JHEP, 2012, 31.
Measurement of the isospin asymmetry in $B \to K^{(*)}μ^+μ^-$ decays
Aaij R. et al., LHCb collaboration (2012), Measurement of the isospin asymmetry in $B \to K^{(*)}μ^+μ^-$ decays, in JHEP, 2012(7), 133.
Measurement of the polarization amplitudes and triple product asymmetries in the B_s^0 -> phi phi decay
Aaij R. et al., LHCb collaboration (2012), Measurement of the polarization amplitudes and triple product asymmetries in the B_s^0 -> phi phi decay, in Phys.Lett. B, 713, 369-377.
Measurement of the ratio of branching fractions ${/cal B}(B^0 \to K^{*0}\gamma)/{\cal B}(B_s^0 \to\phi\gamma)$}
Aaij R. et al., LHCb collaboration (2012), Measurement of the ratio of branching fractions ${/cal B}(B^0 \to K^{*0}\gamma)/{\cal B}(B_s^0 \to\phi\gamma)$}, in Phys. Rev., D 85, 112013.
Measurement of the ratio of prompt $χ_{c}$ to $J/ψ$ production in $pp$ collisions at $\sqrt{s}=7$ TeV
Aaij R. et al., LHCb collaboration (2012), Measurement of the ratio of prompt $χ_{c}$ to $J/ψ$ production in $pp$ collisions at $\sqrt{s}=7$ TeV, in Phys. Lett., B718, 431-440.
Measurements of Bc+ Production and Mass with the Bc+→J/ψπ+ Decay
Aaij R. et al., LHCb collaboration (2012), Measurements of Bc+ Production and Mass with the Bc+→J/ψπ+ Decay, in Phys.Rev.Lett., 109(23), 232001.
Measurements of the branching fractions and CP asymmetries of B+ to J/psi pi+ and B+ to psi(2S) pi+ decays
Aaij R. et al., LHCb collaboration (2012), Measurements of the branching fractions and CP asymmetries of B+ to J/psi pi+ and B+ to psi(2S) pi+ decays, in Phys. Rev. D, 85, 091105.
Measurements of the branching fractions of the decays $B^{0}_{s} \to D^{\mp}_{s} K^{\pm} $ and $B^{0}_{s} \to D^{-}_{s} π^{+}$
Aaij R. et al., LHCb collaboration (2012), Measurements of the branching fractions of the decays $B^{0}_{s} \to D^{\mp}_{s} K^{\pm} $ and $B^{0}_{s} \to D^{-}_{s} π^{+}$, in Journal of High Energy Physics, 2012, 115.
Observation of $J/\psi$ pair production in $pp$ collisions at $\sqrts=7 $ TeV
Aaij R. et al., LHCb collaboration (2012), Observation of $J/\psi$ pair production in $pp$ collisions at $\sqrts=7 $ TeV, in Phys. Lett., B707, 52-59.
Observation of CP violation in B+ to DK+ decays
Aaij R. et al., LHCb collaboration (2012), Observation of CP violation in B+ to DK+ decays, in Physics Letters B , 712(3), 203-212.
Observation of double charm production involving open charm in pp collisions at $\sqrt{s}$=7 TeV
Aaij R. et al., LHCb collaboration (2012), Observation of double charm production involving open charm in pp collisions at $\sqrt{s}$=7 TeV, in JHEP, 06, 141.
Observation of excited Lambda_b0 baryons
Aaij R. et al., LHCb collaboration (2012), Observation of excited Lambda_b0 baryons, in Phys.Rev.Lett., 109, 172003.
Observation of the decay B0 -> D0bar K+ K- and evidence for Bs -> D0bar K+ K-
Aaij R. et al., LHCb collaboration (2012), Observation of the decay B0 -> D0bar K+ K- and evidence for Bs -> D0bar K+ K-, in Phys.Rev.Lett., 109(13), 131801.
Opposite-side flavour tagging of $B$ mesons at the LHCb experiment
Aaij R. et al., LHCb collaboration (2012), Opposite-side flavour tagging of $B$ mesons at the LHCb experiment, in Eur. Phys. J., C 72, 2022.
Search for the $X(4140)$ in $B^+\to J/psi\phi K^+$
Aaij R. et al., LHCb collaboration (2012), Search for the $X(4140)$ in $B^+\to J/psi\phi K^+$, in Phys. Rev., D 85, 091103.
Searches for Majorana neutrinos in $B^-$ decays
Aaij R. et al., LHCb collaboration (2012), Searches for Majorana neutrinos in $B^-$ decays, in Phys. Rev., D 85, 112004.
Searches for the rare decays $B^0_s \to\mu^+\mu^-$ and $B^0 \to \mu^+\mu^-$
Aaij R., others (2012), Searches for the rare decays $B^0_s \to\mu^+\mu^-$ and $B^0 \to \mu^+\mu^-$, in Phys. Lett., B708, 55-67.
Strong constraints on the rare decays Bs -> mu+ mu- and B0 -> mu+ mu-
Aaij R. et al., LHCb collaboration (2012), Strong constraints on the rare decays Bs -> mu+ mu- and B0 -> mu+ mu-, in Phys.Rev.Lett., 108, 231801.
Study of D sJ decays to D + K 0 S and D 0 K +
Aaij R. et al., LHCb collaboration (2012), Study of D sJ decays to D + K 0 S and D 0 K +, in JHEP, 10, 151.
A novel alignment procedure and results for the LHCb Silicon Tracker detector
Dupertuis F. (for the LHCb Silicon Tracker and alignment groups) (2011), A novel alignment procedure and results for the LHCb Silicon Tracker detector, in Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC), 2011 IEEE, 1314-1318.
Absolute luminosity measurements with the LHCb detector at the LHC
Aaij R. et al., LHCb collaboration (2011), Absolute luminosity measurements with the LHCb detector at the LHC, in JINST, 7, P01010.
Determination of $f_s/f_d$ for 7 Tev $pp$ collisions and a measurement of the branching fraction of the decay $B^0 \to D^-K^+$
Aaij R. et al., LHCb collaboration (2011), Determination of $f_s/f_d$ for 7 Tev $pp$ collisions and a measurement of the branching fraction of the decay $B^0 \to D^-K^+$, in Phys. Rev. Lett., 107, 211801.
Differential branching fraction and angular analysis of the decay $B^0 \to K^{*0} \mu^+ \mu^-$
Aaij R. et al., LHCb collaboration (2011), Differential branching fraction and angular analysis of the decay $B^0 \to K^{*0} \mu^+ \mu^-$, in Phys. Rev. Lett., 108, 181806.
First observation of $\barB^0_s \to D_{s2}^{*+} X \mu^- \bar\nu$ decays
Aaij R. et al., LHCb collaboration (2011), First observation of $\barB^0_s \to D_{s2}^{*+} X \mu^- \bar\nu$ decays, in Phys. Lett., B698, 14-20.
First observation of $B^0_s \to J/\psi f_0(980)$ decays
Aaij R. et al., LHCb collaboration (2011), First observation of $B^0_s \to J/\psi f_0(980)$ decays, in Phys. Lett., B698, 115-122.
Measurement of $J/\psi$ production in $pp$ collisions at $\sqrts=7$ TeV
Aaij R. et al., LHCb collaboration (2011), Measurement of $J/\psi$ production in $pp$ collisions at $\sqrts=7$ TeV, in Eur. Phys. J., C71, 1645.
Measurement of $V^0$ production ratios in $pp$ collisions at $\sqrts = 0.9$ and 7 Tev
Aaij R. et al., LHCb collaboration (2011), Measurement of $V^0$ production ratios in $pp$ collisions at $\sqrts = 0.9$ and 7 Tev, in JHEP, 1108, 034.
Measurement of charged particle multiplicities in $pp$ collisions at $\sqrts =7$ TeV in the forward region
Aaij R. et al., LHCb collaboration (2011), Measurement of charged particle multiplicities in $pp$ collisions at $\sqrts =7$ TeV in the forward region, in Eur. Phys. J., C 72, 1947.
Measurement of mixing and CP violation parameters in two-body charm decays
Aaij R. et al., LHCb collaboration (2011), Measurement of mixing and CP violation parameters in two-body charm decays, in J. High Energy Phys., 1204, 129.
Measurement of the $B^0_s-\barB^0_s$ oscillation frequency $\Delta m_s$ in $B^0_s \to D_s (3)\pi$ decays
Aaij R. et al., LHCb collaboration (2011), Measurement of the $B^0_s-\barB^0_s$ oscillation frequency $\Delta m_s$ in $B^0_s \to D_s (3)\pi$ decays, in Phys. Lett. , B709, 177-184.
Observation of $X(3872)$ production in $pp$ collisions at $\sqrts= 7$ TeV
Aaij R. et al., LHCb collaboration (2011), Observation of $X(3872)$ production in $pp$ collisions at $\sqrts= 7$ TeV, in Eur. Phys. J., C 72, 1972.
Search for the lepton number violating decays $B^+ \to \pi^- \mu^+ \mu^+$ and $B^+ \to K^- \mu^+ \mu^+$
Aaij R. et al., LHCb collaboration (2011), Search for the lepton number violating decays $B^+ \to \pi^- \mu^+ \mu^+$ and $B^+ \to K^- \mu^+ \mu^+$, in Phys. Rev. Lett., 108, 101601.
Search for the rare decays $B^0_s \to \mu^+\mu^-$ and $B^0 \to \mu^+\mu^-$
Aaij R. et al., LHCb collaboration (2011), Search for the rare decays $B^0_s \to \mu^+\mu^-$ and $B^0 \to \mu^+\mu^-$, in Phys. Lett., B699, 330-340.
First observation of the decay $\barB^0_s \to D^0 K^{*0}$ and a measurement of the ratio of branching fractions $\frac{{\cal B}(\barB^0_s \to D^0 K^{*0})}{{\cal B}(\barB^0 \to D^0 \rho^0)}$
Aaij R. et al., LHCb collaboration (2010), First observation of the decay $\barB^0_s \to D^0 K^{*0}$ and a measurement of the ratio of branching fractions $\frac{{\cal B}(\barB^0_s \to D^0 K^{*0})}{{\cal B}(\barB^0 \to D^0 \rho^0)}$, in Phys. Lett., B706, 32-39.
Measurement of $\sigma(pp \to b \barb X)$ at $\sqrts=7$ TeV in the forward region
Aaij R. et al., LHCb collaboration (2010), Measurement of $\sigma(pp \to b \barb X)$ at $\sqrts=7$ TeV in the forward region, in Phys. Lett., B694, 209-216.
Measurement of the inclusive $\phi$ cross-section in $pp$ collisions at $\sqrts = 7$ TeV
Aaij R. et al., LHCb collaboration (2010), Measurement of the inclusive $\phi$ cross-section in $pp$ collisions at $\sqrts = 7$ TeV, in Phys. Lett., B703, 267-273.
Measurements of the branching fractions for $B_{(s)} \to D_{(s)}\pi\pi\pi$ and $\Lambda_b^0 \to \Lambda_c^+\pi\pi\pi$
Aaij R. et al., LHCb collaboration (2010), Measurements of the branching fractions for $B_{(s)} \to D_{(s)}\pi\pi\pi$ and $\Lambda_b^0 \to \Lambda_c^+\pi\pi\pi$, in Phys. Rev., D84, 092001.
Prompt $\KS$ production in $pp$ collisions at $\sqrts=0.9$ TeV
Aaij R. et al., LHCb collaboration (2010), Prompt $\KS$ production in $pp$ collisions at $\sqrts=0.9$ TeV, in Phys.Lett., B693, 69-80.
Search for CP violation in $D^+ \to K^-K^+\pi^+$ decays
Aaij R. et al., LHCb collaboration (2010), Search for CP violation in $D^+ \to K^-K^+\pi^+$ decays, in Phys. Rev., D84, 112008.
Alignment of the LHCb tracking system
Märki R. (for the LHCb alignment group), Alignment of the LHCb tracking system, in procs. 13th ICATPP Conference on Astroparticle, Particle, ...., Como, Italy, 3-7 October 2011.
Determination of the X(3872) meson quantum numbers
Aaij R. et al., LHCb collaboration, Determination of the X(3872) meson quantum numbers, in submitted to Phys.Rev.Lett..
First measurement of the CP-violating phase in $B_s^0 \to φφ$ decays
Aaij R. et al., LHCb collaboration, First measurement of the CP-violating phase in $B_s^0 \to φφ$ decays, in submitted to Phys.Rev.Lett..
First observation of the decay $B_{s2}^*(5840)^0 \to B^{*+} K^-$ and studies of excited $B_s$ mesons
Aaij R. et al., LHCb collaboration, First observation of the decay $B_{s2}^*(5840)^0 \to B^{*+} K^-$ and studies of excited $B_s$ mesons, in to appear in Phys.Rev.Lett..
First observations of $\bar{B}_s^0\to D^+D^-$, $D_s^+D^-$ and $D^0\bar{D}^0$ decays
Aaij R. et al., LHCb collaboration, First observations of $\bar{B}_s^0\to D^+D^-$, $D_s^+D^-$ and $D^0\bar{D}^0$ decays, in submitted to Phys.Rev. D.
Heavy flavour spectroscopy at LHCb
Märki R. (on behalf of the LHCb collaboration), Heavy flavour spectroscopy at LHCb, in procs. ICHEP 2012, Melbourne, Australia, 4-11 July 2012.
Implications of LHCb measurements and future prospects
Aaij R. et al., LHCb collaboration, Implications of LHCb measurements and future prospects, in to appear in Eur.Phys.J. , C.
Measurement of CP violation and the B_s^0 meson decay width difference with B_s^0\to J/ψK^+ K^- and B_s^0\to J/ψπ^+π^- decays
Aaij R. et al., LHCb collaboration, Measurement of CP violation and the B_s^0 meson decay width difference with B_s^0\to J/ψK^+ K^- and B_s^0\to J/ψπ^+π^- decays, in submitted to Phys.Rev. D.
Measurement of the forward energy flow in pp collisions at sqrt(s)=7 TeV
Aaij R. et al., LHCb collaboration, Measurement of the forward energy flow in pp collisions at sqrt(s)=7 TeV, in to appear in Eur.Phys.J.C.
Measurement of the Λ_b^0, Ξ_b^- and Ω_b^- baryon masses
Aaij R. et al., LHCb collaboration, Measurement of the Λ_b^0, Ξ_b^- and Ω_b^- baryon masses, in to appear in Phys.Rev.Lett..
Measurements of the Lambda_b0 -> J/psi Lambda decay amplitudes and the Lambda_b0 polarisation in pp collisions at sqrt(s) = 7 TeV
Aaij R. et al., LHCb collaboration, Measurements of the Lambda_b0 -> J/psi Lambda decay amplitudes and the Lambda_b0 polarisation in pp collisions at sqrt(s) = 7 TeV, in submitted to Phys.Lett. B.
Observation of the decay $B_c^+ \to ψ(2S)π^+$
Aaij R. et al., LHCb collaboration, Observation of the decay $B_c^+ \to ψ(2S)π^+$, in submitted to Phys.Rev.Lett..
Observation of the suppressed ADS modes $B^\pm \to [π^\pm K^\mp π^+π^-]_D K^\pm$ and $B^\pm \to [π^\pm K^\mp π^+π^-]_D π^\pm$
Aaij R. et al., LHCb collaboration, 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 submitted to Phys.Lett. B.
Prospects for time-dependent asymmetries at LHCb
Dupertuis F. (on behalf of the LHCb collaboration), Prospects for time-dependent asymmetries at LHCb, in procs. 7th International Workshop on the CKM Unitarity Triangle, Cincinnati, USA,Sept.28–Oct.2, 2012.
Search for CP violation in D+ -> phi pi+ and Ds+ -> Ks pi+ decays
Aaij R. et al., LHCb collaboration, Search for CP violation in D+ -> phi pi+ and Ds+ -> Ks pi+ decays, in submitted to J. High Energy Phys..
Search for direct CP violation in D0 -> h- h+ modes using semileptonic B decays
Aaij R. et al., LHCb collaboration, Search for direct CP violation in D0 -> h- h+ modes using semileptonic B decays, in submitted to Phys.Lett. B.
Search for rare $B^0_{(s)}\rightarrow μ^+ μ^- μ^+ μ^-$ decays
Aaij R. et al., LHCb collaboration, Search for rare $B^0_{(s)}\rightarrow μ^+ μ^- μ^+ μ^-$ decays, in submitted to Phys.Rev.Lett..
Search for the decay Bs -> D*-+ π+-
Aaij R. et al., LHCb collaboration, Search for the decay Bs -> D*-+ π+-, in submitted to Phys.Rev. D.
The LHCb Silicon Tracker, first operational results
Esperante D. et al., LHCb Silicon Tracker group, The LHCb Silicon Tracker, first operational results, in procs. 12th International Instrumentation and Measurement Tech. Conf., Austin(TX), USA, 3-6 May 2010.
The LHCb Silicon Tracker: Running experience
Adeva B. et al., LHCb Silicon Tracker group, The LHCb Silicon Tracker: Running experience, in procs. Topical Workshop on Electronics for Particle Physics, Oxford, UK, 17-21 September 2012.

Collaboration

Group / person Country
Types of collaboration
LHCb Collaboration at CERN (63 institutions from 17 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
14th International Conference on B physics at Hadron Machines (BEAUTY 2013) Talk given at a conference Measurement of the CP-violating phase φs and Bs0 lifetimes with Bs0 → J/ψh+h− decays at LHCb 08.04.2013 Bologna, Italy Dupertuis Frédéric Guillaume;
LHC Student Poster Session of the 113th Meeting of the LHC Committee, CERN Poster Measurement of the Λ0b, Ξ−b and Ω−b baryon masses 13.03.2013 Geneva, Switzerland Märki Raphael;
27e Rencontres de Physique de la Vallée d'Aoste Talk given at a conference b-baryon mass measurements at LHCb 24.02.2013 La Thuile, Italy Märki Raphael;
7th International Workshop on the CKM Unitarity Triangle Talk given at a conference Prospects for time-dependent asymmetries at LHCb 28.09.2012 Cincinnati, United States of America Dupertuis Frédéric Guillaume;
36th International Conference on High Energy Physics (ICHEP 2012) Talk given at a conference Heavy flavour spectroscopy at LHCb 04.07.2012 Melbourne, Australia Märki Raphael;
Annual meeting of the Swiss Physical Society Talk given at a conference Tagged time-dependent angular analysis of Bs0 → J/ψφ decays at LHCb 21.06.2012 Zurich, Switzerland Dupertuis Frédéric Guillaume;
LHC Student Poster Session of the 109th Meeting of the LHC Committee, CERN Poster Tagged time-dependent angular analysis of Bs0 → J/ψφ decays at LHCb 21.03.2012 Geneva, Switzerland Dupertuis Frédéric Guillaume;
CHIPP PhD Winter School Talk given at a conference Search for CP violation in Bs0 → J/ψφ at the LHCb experiment 22.01.2012 Engelberg, Switzerland Dupertuis Frédéric Guillaume;
2011 IEEE Nuclear Science Symposium and Medical Imaging Conference Talk given at a conference A novel alignment procedure and results for the LHCb Silicon Tracker detector 23.10.2011 Valencia, Spain Dupertuis Frédéric Guillaume;
13th ICATPP Conference on Astroparticle, Particle, Space Physics and Detectors for Physics Applications Talk given at a conference Alignment of the LHCb tracking system 03.10.2011 Como, Italy Märki Raphael;
Workshop on mid-term results of the Centre of Advanced Studies in Particle Physics (C-15 SUK/CUS project) Talk given at a conference Y alignment of the LHCb tracker 28.07.2011 Zurich, Switzerland Dupertuis Frédéric Guillaume;


Communication with the public

Communication Title Media Place Year
New media (web, blogs, podcasts, news feeds etc.) Precise search for new physics Public web page of LHCb experiment Western Switzerland 2013
New media (web, blogs, podcasts, news feeds etc.) Heavier strange-beauty lives longer and improved phi_s measurements Public web page of LHCb experiment Western Switzerland 2012
New media (web, blogs, podcasts, news feeds etc.) LHCb strongly squeezes SUSY parameter space Public web page of LHCb experiment Western Switzerland 2012
New media (web, blogs, podcasts, news feeds etc.) Different properties of matter and antimatter for Bs mesons Public web page of LHCb experiment Western Switzerland 2011

Associated projects

Number Title Start Funding scheme
119968 High Precision CP Violation Physics at LHCb 01.04.2008 Project funding
141288 FORCE 2012: High Precision CP Violation Physics at LHCb 01.07.2012 FORCE / CERN
125035 FORCE 2009: High Precision CP Violation Physics at LHCb 01.04.2009 FORCE / CERN
147467 FLARE 2013: Operation and upgrade of the LHCb experiment 01.04.2013 FLARE
134940 FORCE 2011: High Precision CP Violation Physics at LHCb 01.07.2011 FORCE / CERN
141096 High Precision CP Violation Physics at LHCb 01.04.2012 Project funding

Abstract

The LHCb experiment is designed for precise measurements of CP violation and rare B decays, exploiting the very large bb production cross section at the LHC collider at CERN. LHCb's main physics aims are to elucidate the flavour structure in the quark sector, and hopefully observe signals from New Physics.The LHCb detector is now fully constructed and installed. It is ready to record LHC's first collisions, expected in fall 2009. The commissioning, calibration and alignment of the detector are well underway and will be completed soon after the first collisions are delivered. The physics program will be deployed after the LHC reaches a center-of-mass energy in excess of 4 TeV and a luminosity of the order of 10^32 cm^-2 s^-1. Our research group has worked on LHCb since the beginning of the project in 1995, playing important roles in the leadership of the experiment. We have fulfilled our construction responsibilities, which included the development, construction and commissioning of the common readout board TELL1, of electronics and transmission lines for the silicon vertex detector VELO, of the silicon Inner Tracker detector, as well as a contribution to the DAQ and high-level trigger hardware. In addition, we have participated in the development of trigger algorithms and general software, in the optimization of physics performance, and in the preparation for physics analysis. During the period covered by this request we plan to reach a stable physics operation regime. Our main objectives are the smooth operation and maintenance of the hardware components under our responsibility, the participation in general collaboration tasks such as physics data taking, and, last but not least, data analysis in view of the publication of physics results. Within the ProDoc training module entitled "Particle physics in the LHC era", we request funds to support two PhD students who will work on the following physics topics, using the LHCb data collected in the years 2010 and 2011:1) measurement of the CP-violating phase in B0s -> J/psi phi decays;2) search for new b baryons and measurement of their masses, lifetimes and production rates. The PhD students will be selected according to the procedures outlined in the proposal of the ProDoc training module, enrolled in the physics program of EPFL's doctoral school, and participate in the activities organized within the ProDoc training module. They will work in close contact with the post-docs hired through the ongoing SUK/CUS project C-15 entitled "Swiss centre for advanced studies in particle physics in the LHC era".
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