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High Precision CP Violation Physics at LHCb

English title High Precision CP Violation Physics at LHCb
Applicant Schneider Olivier
Number 130202
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 01.04.2010 - 31.03.2012
Approved amount 1'475'477.00
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Keywords (10)

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

Lay Summary (English)

Lead
Lay summary
LHCb is an experiment designed for precise measurements of CP violation and rare B decays, exploiting the very large bb bar 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 was ready to record LHC's first collisions at the end of 2009, and will deploy its full physics program as soon as the LHC reaches the required luminosity. The LHCb collaboration is studying the possibility of upgrading the detector in view of running at ?10 times higher instantaneous luminosities.Our particle physics group in Lausanne has worked on LHCb since the beginning of the project in 1995 and plays important roles in the leadership of the experiment. We have fulfilled our detector construction responsibilities, which included the development, construction and installation of the so-called TELL1 common readout boards, of the transmission electronics for the silicon vertex detector VELO, and of the silicon Inner Tracker stations, in collaboration with other institutes (in particular the University of Zurich). All this equipment has now been commissioned without and with real particles going through the detector (produced by cosmic rays or beam injected in the LHC). In addition, we have contributed for several years to the development of trigger algorithms and general software, to the optimization of the physics performance, and to the preparation for physics analysis. In view of a possible future involvement in the LHCb upgrade, we also recently undertook new R&D activities for an upgraded TELL1 board and in the area of fibre tracking.Our objectives for the two-year funding period 2010-2012 are the following:o Operate, monitor, maintain and (when needed) improve the hardware devices under our responsibility to keep them fully operational for physics data-taking.o Contribute in a significant way to the first data analysis and physics measurements with the data taken during the 2010 and 2011 runs.o Design a replacement for the Inner Tracker detector boxes based on the fibre-tracking technology, and start the corresponding construction.o In view of a possible upgrade of LHCb, coordinate the development of subsequent versions of the TELL1 board, in particular the TELL10 board based on 10-Gigabit link technology.
Direct link to Lay Summary Last update: 21.02.2013

Responsible applicant and co-applicants

Employees

Publications

Publication
Measurement of the B+- production cross-section in pp collisions at sqrt(s)=7 TeV
Aaij R. et al., LHCb collaboration (2017), Measurement of the B+- production cross-section in pp collisions at sqrt(s)=7 TeV, in JHEP, 1204, 093--.
Absolute luminosity measurements with the LHCb detector at the LHC
Aaij R. et al., LHCb collaboration (2012), Absolute luminosity measurements with the LHCb detector at the LHC, in JINST, 7, P01010--.
Evidence for CP violation in time-integrated D0 → h−h+ decay rates
Aaij R. et al., LHCb collaboration (2012), Evidence for CP violation in time-integrated D0 → h−h+ decay rates, in Phys.Lett., 108, 111602--.
First observation of the decay Bs0 → K∗0K∗0
Aaij R. et al., LHCb collaboration (2012), First observation of the decay Bs0 → K∗0K∗0, in Phys.Lett., B709, 50--.
First observation of the decays B0 → D+K−π+π− and B− → D0K−π+π−
Aaij R. et al., LHCb collaboration (2012), First observation of the decays B0 → D+K−π+π− and B− → D0K−π+π−, in Phys.Rev.Lett. , 108, 161801--.
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 masses
Aaij R. et al., LHCb collaboration (2012), Measurement of b-hadron masses, in Phys.Lett., B708, 241--.
Measurement of the B^0_s - \bar{B}^0_s oscillation frequency Delta m_s in B^0_s -> D_s^-(3) pi decays
Aaij R. et al., LHCb collaboration (2012), Measurement of the B^0_s - \bar{B}^0_s oscillation frequency Delta m_s in B^0_s -> D_s^-(3) pi decays, in Phys.Lett., B709, 177-184.
Measurement of the CP violating phase φs in B0s → J/ψf0(980)
Aaij R. et al., LHCb collaboration (2012), Measurement of the CP violating phase φs in B0s → J/ψf0(980), in Phys.Lett., B707, 497-505.
Measurement of the CP-violating phase φs in the decay Bs0 → J/ψ φ
Aaij R. et al., LHCb collaboration (2012), Measurement of the CP-violating phase φs in the decay Bs0 → J/ψ φ, in Phys.Rev.Lett., 108, 101803--.
Measurement of the effective Bs0 → K+K− lifetime
Aaij R. et al., LHCb collaboration (2012), Measurement of the effective Bs0 → K+K− lifetime, in Phys.Lett., B707, 349-356.
Observation of $J/ψ$ pair production in pp collisions at $\sqrt{s}=7 TeV$
Aaij R. et al., LHCb collaboration (2012), Observation of $J/ψ$ pair production in pp collisions at $\sqrt{s}=7 TeV$, in Phys.Lett., B707, 52-59.
Observation of B0s → J/ψf2′(1525) in J/ψK+K− final states
Aaij R. et al., LHCb collaboration (2012), Observation of B0s → J/ψf2′(1525) in J/ψK+K− final states, in Phys.Rev.Lett., 108, 151801--.
Search for the lepton number violating decays B+ → π−μ+μ+ and B+ → K−μ+μ+
Aaij R. et al., LHCb collaboration (2012), Search for the lepton number violating decays B+ → π−μ+μ+ and B+ → K−μ+μ+, in Phys.Rev.Lett., 108, 101601--.
Search for the rare decays Bs0 → μ+μ− and B0 → μ+μ−
Aaij R. et al., LHCb collaboration (2012), Search for the rare decays Bs0 → μ+μ− and B0 → μ+μ−, in Phys.Lett., B708, 55--.
Determination of fs/fd for 7 TeV pp collisions and a measurement of the branching fraction of the decay B0 → D−K+
Aaij R. et al., LHCb collaboration (2011), Determination of fs/fd for 7 TeV pp collisions and a measurement of the branching fraction of the decay B0 → D−K+, in Phys.Rev.Lett., 107, 211801--.
First observation of B0 → D∗+Xμ−ν decays
Aaij R. et al., LHCb collaboration (2011), First observation of B0 → D∗+Xμ−ν decays, in Phys.Lett., B698, 14-20.
First observation of Bs0 → J/ψf0(980) decays
Aaij R. et al., LHCb collaboration (2011), First observation of Bs0 → J/ψf0(980) decays, in Phys.Lett. , B698, 115-122.
First observation of the decay B0s → D0K∗0 and a measurement of the ratio of branching fractions 0 0 ∗0 B(Bs→D K ) B(B0→D0ρ0)
Aaij R. et al., LHCb collaboration (2011), First observation of the decay B0s → D0K∗0 and a measurement of the ratio of branching fractions 0 0 ∗0 B(Bs→D K ) B(B0→D0ρ0), in Phys.Lett., B706, 32-39.
Measurement of J/ψ√production in ppcollisionsat s=7TeV
Aaij R. et al., LHCb collaboration (2011), Measurement of J/ψ√production in ppcollisionsat s=7TeV, in Eur.Phys.J , C71, 1645--.
Measurement of sigma(pp -> b anti-b X) at \sqrt(s)=7 TeV in the forward region
Aaij R. et al., LHCb collaboration (2011), Measurement of sigma(pp -> b anti-b X) at \sqrt(s)=7 TeV in the forward region, in Phys.Lett. , B694, 209-216.
Measurement of the inclusive φ cross-section in pp collisions at √s = 7 TeV
Aaij R. et al., LHCb collaboration (2011), Measurement of the inclusive φ cross-section in pp collisions at √s = 7 TeV, in Phys.Lett., B703, 267-273.
Measurement of V 0 production ratios in pp collisions at √s = 0.9 and 7 TeV
Aaij R. et al., LHCb collaboration (2011), Measurement of V 0 production ratios in pp collisions at √s = 0.9 and 7 TeV, in JHEP , 08, 34--.
Measurements of the Branching fractions for B(s) → D(s)πππ and Λ 0b → Λ +c π π π
Aaij R. et al., LHCb collaboration (2011), Measurements of the Branching fractions for B(s) → D(s)πππ and Λ 0b → Λ +c π π π, in Phys.Rev., D84, 092001--.
Search for the rare decays Bs0 → μ+μ− and B0 → μ+μ−
Aaij R. et al., LHCb collaboration (2011), Search for the rare decays Bs0 → μ+μ− and B0 → μ+μ−, in Phys.Lett., B699, 330-340.
Prompt KS0 production in pp collisions at √s = 0.9 TeV
Aaij R. et al., LHCb collaboration (2010), Prompt KS0 production in pp collisions at √s = 0.9 TeV, in Phys.Lett.B693, B693, 69-80.
Determination of the sign of the decay width difference in the Bs0 system
Aaij R. et al., LHCb collaboration, Determination of the sign of the decay width difference in the Bs0 system, in To appear in Phys.Rev.Lett..
Differential branching fraction and angular analysis of the decay B0 → K∗0μ+μ−
Aaij R. et al., LHCb collaboration, Differential branching fraction and angular analysis of the decay B0 → K∗0μ+μ−, in To appear in Phys.Rev.Lett..
First evidence of direct CP violation in charmless two-body decays of Bs0 mesons
Aaij R. et al., LHCb collaboration, First evidence of direct CP violation in charmless two-body decays of Bs0 mesons, in To appear in Phys.Rev.Lett..
First observation of the decay Bc+ → J/ψπ+π−π+
Aaij R. et al., LHCb collaboration, First observation of the decay Bc+ → J/ψπ+π−π+, in Submitted to Phys.Rev.Lett..
Measurement of charged particle multiplicities in pp collisions at √s = 7 TeV in the forward region
Aaij R. et al., LHCb collaboration, Measurement of charged particle multiplicities in pp collisions at √s = 7 TeV in the forward region, in To appear in Eur.Phys.J. C.
Measurement of mixing and CP violation parameters in two-body charm decays
Aaij R. et al., LHCb collaboration, Measurement of mixing and CP violation parameters in two-body charm decays, in Submitted to JHEP.
Measurement of the cross-section ratio $σ(χ_{c2})/σ(χ_{c1})$ for prompt $χ_c$ production at $\sqrt{s}=7$ TeV
Aaij R. et al., LHCb collaboration, Measurement of the cross-section ratio $σ(χ_{c2})/σ(χ_{c1})$ for prompt $χ_c$ production at $\sqrt{s}=7$ TeV, in Submitted to Phys.Lett. B.
Measurement of the ratio of branching fractions B(B0 → K∗0γ)/B(Bs0 → φγ)
Aaij R. et al., LHCb collaboration, Measurement of the ratio of branching fractions B(B0 → K∗0γ)/B(Bs0 → φγ), in Submitted to Phys.Rev. D.
Measurement of Υ production in pp collisions at √s = 7 TeV
Aaij R. et al., LHCb collaboration, Measurement of Υ production in pp collisions at √s = 7 TeV, in Submitted to Eur.Phys.J. C.
Measurements of the branching fractions and CP asymmetries of B+ to J/psi pi+ and B+ to psi(2S) pi+ decays
Aaji R. et al., LHCb collaboration, Measurements of the branching fractions and CP asymmetries of B+ to J/psi pi+ and B+ to psi(2S) pi+ decays, in To appear in Phys.Rev. D.
Observation of CP violation in B± → DK± decays
Aaij R. et al., LHCb collaboration, Observation of CP violation in B± → DK± decays, in Submitted to Phys.Lett. B.
Observation of X(3872) production in pp collisions at sqrt(s)= 7 TeV
Aaij R. et al., LHCb collaboration, Observation of X(3872) production in pp collisions at sqrt(s)= 7 TeV, in To appear in Eur.Phys.J. C.
Opposite-side flavour tagging of B mesons at the LHCb experiment
Aaij R. et al., LHCb collaboration, Opposite-side flavour tagging of B mesons at the LHCb experiment, in Submitted to Eur.Phys.J. C.
Search for CP violation in D+ → K−K+π+ decays
Aaij R. et al., LHCb collaboration, Search for CP violation in D+ → K−K+π+ decays, in Phys.Rev., D84, 092001--.
Search for the X(4140) state in B+ → J/ψφK+ decays
Aaij R. et al., LHCb collaboration, Search for the X(4140) state in B+ → J/ψφK+ decays, in To appear in Phys.Rev. D.
Searches for Majorana neutrinos in B− decays
Aaij R. et al., LHCb collaboration, Searches for Majorana neutrinos in B− decays, in To appear in Phys.Rev. D.
Strong constraints on the rare decays Bs0 → μ+μ− and B0 → μ+μ−
Aaij R. et al., LHCb collaboration, Strong constraints on the rare decays Bs0 → μ+μ− and B0 → μ+μ−, in To appear in Phys.Rev.Lett. .

Collaboration

Group / person Country
Types of collaboration
LHCb Collaboration at CERN (55 institutions from 15 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
Seminar at National Institute for Subatomic Physics (NIKHEF) Individual talk On exclusive tau reconstruction at LHCb 26.03.2012 Amsterdam, Netherlands Keune Anne;
109th LHCC Meeting Poster Exotic meson studies at LHCb 21.03.2012 CERN, Geneva, Switzerland Bressieux Joël;
KEK Flavour Factory Workshop 2012 Talk given at a conference Flavour physics results at LHCb 08.03.2012 Tsukuba, Japan Schneider Olivier;
CHIPP PhD Winter School Talk given at a conference Study of charmless B decays with the LHCb detector 22.01.2012 Engelberg, Switzerland Prisciandaro Jessica;
8th Hiroshima Symposium on the "Development & Application of Semiconductor Tracking Detectors (HSTD-8) Talk given at a conference Performance of the LHCb Silicon Tracker 05.12.2011 Taipei, Taiwan Cowan Greig Alan;
Physics at LHC Talk given at a conference Mixing and CP-violation in the B0 s system at LHCb 24.10.2011 Perugia, Italy Cowan Greig Alan;
PANIC11 "The 19th Particles and Nuclei International Conference" Talk given at a conference Studies with onia at LHCb 24.07.2011 Cambridge, United States of America Bressieux Joël;
Collider Cross Talk seminar Talk given at a conference Angular analysis of B0 s ! J/  with the 2010 LHCb data 23.06.2011 CERN, Geneva, Switzerland Cowan Greig Alan;
Swiss Physical Society: Joint Annual Meeting (with ÖPG, SSAA, and ÖGAA) Talk given at a conference Measurement of CP-violating parameters in the flavour-tagged time-dependent angular analysis of B0 s ! J/  at LHCb15/ 15.06.2011 Lausanne, Switzerland Cowan Greig Alan;
Swiss Physical Society: Joint Annual Meeting (with ÖPG, SSAA, and ÖGAA) Poster First mass measurements at LHCb 15.06.2011 Lausanne, Switzerland Bressieux Joël;
TIPP 2011 "Technology and Instrumentation in Particle Physics 2011" Talk given at a conference Performance of the LHCb Silicon Tracker detector in the LHC 09.06.2011 Chicago, United States of America Luisier Johan;
Physics at LHC 2011 Poster First mass measurements at LHCb 06.06.2011 Perugia, Italy Bressieux Joël;
479. WE-Heraeus-Seminar on "Physics at LHCb" Talk given at a conference XYZ spectroscopy at LHCb 26.04.2011 Bad Honnef, Germany Bressieux Joël;
Open Session of the CERN Council: Status of the LHC and Experiments Talk given at a conference Overview of LHCb 16.12.2010 CERN, Geneva, Switzerland Cowan Greig Alan;


Communication with the public

Communication Title Media Place Year
Other activities Visit of CERN and LHCb dectector by S&S Sàrl, Génie médico-technique, Moutier, Switzerland Western Switzerland 2012
Other activities CERN visit by the Association des Professeurs de l'EPFL (APEL) Western Switzerland 2011
Other activities CERN visit by the Swiss Federal Council Western Switzerland 2011
New media (web, blogs, podcasts, news feeds etc.) Welcome to the LHCb Experiment Public web page of LHCb experiment International Western Switzerland 2010

Associated projects

Number Title Start Funding scheme
141096 High Precision CP Violation Physics at LHCb 01.04.2012 Project funding
119968 High Precision CP Violation Physics at LHCb 01.04.2008 Project funding
125035 FORCE 2009: High Precision CP Violation Physics at LHCb 01.04.2009 FORCE / CERN
134940 FORCE 2011: High Precision CP Violation Physics at LHCb 01.07.2011 FORCE / CERN
141288 FORCE 2012: High Precision CP Violation Physics at LHCb 01.07.2012 FORCE / CERN

Abstract

LHCb is an experiment designed for precise measurements of CP violation and rare B decays, exploiting the very large large bbbar 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 ready to record LHC's first collisions expected by the end of 2009, and deploy its full physics program as soon as the LHC reaches a luminosity of 2 x 10^32 cm-2 s-1. The LHCb collaboration is studying the possibility to upgrade the detector after an integrated luminosity of about 10 fb-1 in view of running at ~ 10 times higher instantaneous luminosities. Our particle physics group in Lausanne has worked on LHCb since the beginning of the project in 1995 and plays important roles in the leadership of the experiment. We have fulfilled our detector construction responsibilities, which included the development, construction and installation of the so-called TELL1 common readout boards, of the transmission electronics for the silicon vertex detector VELO, and of the silicon Inner Tracker stations, in collaboration with other institutes (in particular the University of Zurich). Since spring 2008 we have commissioned all this equipment without and with real particles going through the detector (produced by cosmic rays or beam injected in the LHC). By the end of March 2010 we anticipate that the commissioning phase with beam-gas and beam-beam collisions will be completed. In addition, we have contributed for several years to the development of trigger algorithms and general software, to the optimization of the physics performance, and to the preparation for physics analysis. In view of a possible future involvement in the LHCb upgrade, we also recently undertook new R&D activities for an upgraded TELL1 board and in the area of fibre tracking.Our objectives for the forthcoming 2-year funding period 2010-2012 are the following:- Operate, monitor, maintain and (when needed) improve the hardware devices under our responsibility to keep them fully operational for physics data-taking.- Contribute in a significant way to the first data analysis and physics measurements with the data taken during the 2010 and 2011 runs.- Design a replacement for the Inner Tracker detector boxes based on the fibre-tracking technology, and start the corresponding construction. - In view of a possible upgrade of LHCb, coordinate the development of subsequent versions of the TELL1 board, in particular the TELL10 board based on 10-Gigabit link technology.
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