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FORCE 2004 : High Precicion CP Violation Physics at LHCb

English title FORCE 2004 : High Precicion CP Violation Physics at LHCb
Applicant Schneider Olivier
Number 103697
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 01.04.2004 - 31.03.2005
Approved amount 300'000.00
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Keywords (10)


Lay Summary (English)

Lay summary

This grant is supporting the participation of the EPFL Laboratory forHigh-Energy Physics in the LHCb project. LHCb is an experiment inelementary particle physics, currently in preparation and scheduled tostart in 2007 at CERN's Large Hadron Collider (LHC); its main scientificgoal is the precise study of CP violation with particles containing bquarks.

The observation that the Universe seems to be made ofmatter, without large amounts of anti-matter, is a puzzling question. Atiny difference between particles and anti-particles, called ``CPasymmetry'' (or violation of the CP symmetry), was discovered in 1964 inan experiment with K mesons. A. Sakharov suggested that this is one of thethree conditions necessary for explaining the dominance of matter overanti-matter in the Universe. Today, CP violation is still not a very wellunderstood phenomenon, even after the recent observation in 2001 of largeCP violation effects in B mesons by two experiments running at ``Bfactories'' operated at the SLAC (Stanford, USA) and KEK (Tsukuba, Japan)laboratories.

The theoretical description of CP violation isrelated to the generation of mass by the Higgs mechanism in the StandardModel of the elementary particles, which results in a set of parameters,grouped in the so-called Cabibbo-Kobayashi-Maskawa matrix. The detailedstudy of these parameters, in particular the ones related to the b and tquarks, is a powerful test of the Standard Model. So far, all experimentalresults are compatible with the Standard Model. However, it should benoted that the amount of CP violation contained in the Standard Model istoo small to explain the observed dominance of matter over anti-matter inthe Universe. Hence, other sources of CP violation might exist in NewPhysics yet to be discovered.

The next generation of B physicsexperiments will include LHCb, which is especially designed for precisemeasurements of CP violation in B decays. It will collect much largerstatistics than the previous B experiments, allowing the observation ofextremely rare phenomena. These data will be used to elucidate thestructure of the quark families, and hopefully observe signal from NewPhysics.

The EPFL laboratory for high-energy physics is playing aleading role in the LHCb collaboration, which involves 44 researchinstitutions from 13 different countries. The commitments to theconstruction of the LHCb apparatus include the off-detector electronics(needed for the data acquisition and trigger system, developed inLausanne) and the Inner Tracker (silicon detectors to measure chargedparticles, developed jointly with University of Zurich).
Direct link to Lay Summary Last update: 21.02.2013

Responsible applicant and co-applicants

Associated projects

Number Title Start Funding scheme
107560 FORCE 2005 : High Precicion CP Violation Physics at LHCb 01.05.2005 FORCE / CERN
100527 FORCE 2003 : High Precision CP violation physics at LHCb 01.04.2003 FORCE / CERN