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FORCE 2012: High Precision CP Violation Physics at LHCb

English title FORCE 2012: High Precision CP Violation Physics at LHCb
Applicant Schneider Olivier
Number 141288
Funding scheme FORCE / CERN
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 01.07.2012 - 30.06.2013
Approved amount 320'728.00
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Keywords (9)

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

Lay Summary (English)

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

LHCb has successfully recorded particle collisions since Spring 2010. Many physics measurements, including from key analyses of the LHCb physics programme, have already been published or made public (see specific information for a non-specialized public at http://lhcb-public.web.cern.ch/ ). So far, all results are compatible with the Standard Model of particle physics. In March 2011, the LHCb collaboration submitted a Letter of Intent for the upgrade of the experiment, to enable data collection with a significantly improved rate.

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 period July 2012-July 2013 are the following:

• Operate, monitor, and maintain the hardware devices under our responsibility to keep them fully operational throughout the current physics data-taking run.

• Continue to contribute significantly to the physics analysis of the already recorded data, with emphasis on CP violation in B particle 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.

This grant, which is coupled with another FORCE grant  obtained by our colleagues at the University of Zurich, will help us achieve our objectives through the funding of a full-time technical position associated with the TELL1 project and its continuation (TELL10), and of the construction of prototypes using the scintillating-fibre technology.
Direct link to Lay Summary Last update: 21.02.2013

Responsible applicant and co-applicants

Employees

Associated projects

Number Title Start Funding scheme
135453 Experimental Particle Physics at the LHC 01.04.2011 Project funding
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
127479 Particle Physics in the LHC Era 01.03.2010 ProDoc
147468 FLARE: Maintenance & Operation for the LHC Experiments 2013 01.04.2013 FLARE
135989 FORCE 2010: Maintenance & Operation for the LHC Experiments 2011 01.04.2011 FORCE / CERN
135188 FORCE 2011: Construction of the LHCb experiment 01.04.2011 FORCE / CERN
130202 High Precision CP Violation Physics at LHCb 01.04.2010 Project funding
134622 FORCE - GRID Infrastructure for LHC Experiments 01.04.2011 FORCE / CERN

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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