Measurements of the CKM angle γ in tree-dominated decays at LHCb

STFC Rutherford Appleton Laboratort, Chilton, Didcot, OX11 0QX

^a e-mail: stefania.ricciardi@stfc.ac.uk

Abstract

We review the first measurements of the CKM angle γ from LHCb. These measurements have been performed with b-hadron decays dominated by b → u and b → c tree-level amplitudes, from which γ can be determined without theoretical uncertainties. Precision is achieved by averaging results from B⁻ → Dh⁻ (h = K,π) decays with D → h⁺h⁻, D → K⁺π⁻, and D → K⁺π⁻π⁺π⁻, and D → K_s⁰h⁺h⁻. Prospects for these and future measurements of γ using neutral b-hadron decays are briefly discussed.