Abstract
We review the first measurements of the CKM angle gamma from LHCb. These measurements have been performed with b-hadron decays dominated by b -> u and b -> c tree-level amplitudes, from which gamma can be determined without theoretical uncertainties. Precision is achieved by averaging results from B- -> Dh- (h= K,pi) decays with D -> h+h-, D -> K+pi-, and D -> K+pi-pi+pi-, and D -> K_S^0h+h-. Prospects for these and future measurements of gamma using neutral b-hadron decays are briefly discussed.
Highlights
The measurement of the CKM angle [ = arg( VudV⇤ub/VcdV⇤cb)] of the Unitarity Triangle (UT) is an important goal of the LHCb physics programme
We review the first measurements of the CKM angle from LHCb
These measurements have been performed with b-hadron decays dominated by b ! u and b ! c tree-level amplitudes, from which can be determined without theoretical uncertainties
Summary
The first constraints on at LHCb have been obtained from time-integrated measurements of charged B mesons [3], which do not require flavour-tagging, can exploit the full statistical power of the large bb production cross-section in pp collisions at the LHC. In these measurements is determined from the interference between B+ ! Time-integrated measurements can be performed with neutral b-hadrons when the concerned decay is selftagged All the presented results use the 2011 dataset, corresppson=d7inTgetVo.an integrated luminosity of 1 fb 1 collected at
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