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The LHCb (standing for "Large Hadron Collider beauty") experiment is one of seven particle physics detector experiments collecting data at the Large Hadron Collider accelerator at CERN. LHCb is a specialized b-physics experiment, that is measuring the parameters of CP violation in the interactions of b-hadrons (heavy particles containing a bottom quark). Such studies can help to explain the Matter-Antimatter asymmetry of the Universe. The detector is also able to perform measurements of production cross sections and electroweak physics in the forward region. Approximately 840 people from 60 scientific institutes, representing 16 countries, form the collaboration who built and operate the detector.〔(), Collaboration webpage〕 As of 2014, the spokesperson for the collaboration is Guy Wilkinson. The experiment is located at point 8 on the LHC tunnel close to Ferney-Voltaire, France just over the border from Geneva. The (small) MoEDAL experiment will share the same cavern. == Physics goals == The experiment has wide physics program covering many important aspects of Heavy Flavor (both beauty and charm), Electroweak and QCD physics. Six key measurements have been identified involving B mesons. These are described in a roadmap document 〔 〕 that form the core physics programme for the first high energy LHC running in 2010–2012. They include: * Measuring the branching ratio of the rare Bs → μ+ μ− decay. * Measuring the forward-backward asymmetry of the muon pair in the flavour changing neutral current Bd → K * μ+ μ− decay. Such a flavour changing neutral current cannot occur at tree-level in the Standard Model of Particle Physics, and only occurs through box and loop Feynman diagrams; properties of the decay can be strongly modified by new Physics. * Measuring the CP violating phase in the decay Bs → J/ψ φ, caused by interference between the decays with and without Bs oscillations. This phase is one of the CP observables with the smallest theoretical uncertainty in the Standard Model, and can be significantly modified by new Physics. * Measuring properties of radiative B decays, i.e. B meson decays with photons in the final states. Specifically, these are again flavour changing neutral current decays. * Tree-level determination of the unitarity triangle angle γ. * Charmless charged two-body B decays. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「LHCb」の詳細全文を読む スポンサード リンク
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