The LHCb experiment is dedicated to precision measurements of CP violation and rare decays of B hadrons at the Large Hadron Collider (LHC) at CERN (Geneva). The initial configuration and expected performance of the detector and associated systems, as established by test beam measurements and simulation studies, is described.
We describe a novel use of the Dalitz plot to probe CP symmetry in three-body modes of B and D mesons. It is based on an observable inspired by astronomers' practice, namely the significance in the difference between corresponding Dalitz plot bins. It provides a model independent mapping of local CP asymmetries. We illustrate the method for probing CP symmetry in the two complementary cases of B and D decays: in the former sizable or even large effects can be expected, yet have to be differentiated against leading Standard Model contributions, while in the latter one cannot count on sizable effects, yet has to deal with much less Standard Model background.
We discuss some aspects of the search for CP asymmetry in the three body B decays, revealed through the interference among neighbor resonances in the Dalitz plot. We propose a competitive method to extract the CKM γ angle combining Dalitz plot amplitude analysis of B ± → K ± π + π − and untagged B 0 ,B 0 → K s π + π − . The method also obtains the ratio and phase difference between the tree and penguin contributions from B 0 andB 0 → K * ± π ∓ decays and the CP asymmetry between B 0 andB 0 . From Monte Carlo studies of 100K events for the neutral mesons, we show the possibility of measuring γ.
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