Abstract
During 2011 the LHCb experiment at CERN collected 1.0 fb−1 of \(\sqrt{s} = 7\mbox{~TeV}\) pp collisions. Due to the large heavy quark production cross-sections, these data provide unprecedented samples of heavy flavoured hadrons. The first results from LHCb have made a significant impact on the flavour physics landscape and have definitively proved the concept of a dedicated experiment in the forward region at a hadron collider. This document discusses the implications of these first measurements on classes of extensions to the Standard Model, bearing in mind the interplay with the results of searches for on-shell production of new particles at ATLAS and CMS. The physics potential of an upgrade to the LHCb detector, which would allow an order of magnitude more data to be collected, is emphasised.
Highlights
The term rare decay is used within this document to refer loosely to two classes of decays: flavour-changing neutral current (FCNC) processes that are mediated by electroweak box and penguin type diagrams in the SM; more exotic decays, including searches for lepton flavour or number violating decays of B or D mesons and for light scalar particles.The first broad class of decays includes the rare radiative process Bs0 → φγ and rare leptonic and semileptonic decays B(0s) → μ+μ− and B0 → K∗0μ+μ−
In many well motivated new physics models, new particles at the TeV scale can enter in diagrams that compete with the SM processes, leading to modifications of branching fractions or angular distributions of the daughter particles in these decays
The present analysis shows no particular enhancement of the contribution proportional to eiγ in Bs0 → K+K−, in agreement with the expectation that Bs0 → K(∗)0K(∗)0 should be penguindominated to a very good accuracy. 49LHCb has presented preliminary results from model-independent searches for CP violation in B± → π +π −K± and B± → K+K−K± at ICHEP 2012 [376], and in B± → π +π −π ± and B± → K+K−π ± at Cabibbo– Kobayashi–Maskawa (CKM) 2012 [377]
Summary
The LHCb detector [1] is a single-arm forward spectrometer covering the pseudorapidity range 2 < η < 5, designed for the study of particles containing b or c quarks. The LHC pp The majority run at of the a centredata was recorded at an instantaneous luminosity of Linst = 3.5 × 1032 cm−2 s−1, nearly a factor of two above the LHCb design value, and with a pile-up rate (average number of visible interactions per crossing) of μ ∼ 1.5 A luminosity levelling procedure, where the beams are displaced at the LHCb interaction region, allows LHCb to maintain an approximately constant luminosity throughout each LHC fill. This procedure permitted reliable operation of the experiment and a stable trigger configuration throughout 2011. Thanks to the excellent performance of the LHCb detector, the overall data taking efficiency exceeded 90 %
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