Direct C P violation in charmless three-body decays of B ± mesons
Measurements of CP asymmetries in charmless three-body decays of B ± mesons are reported using proton-proton collision data collected by the LHCb detector, corresponding to an integrated luminosity of 5.9 fb –1 . The previously observed CP asymmetry in B ± →π ± K + K – decays is confirmed, and CP asymmetries are observed with a significance of more than five standard deviations in the B ± →π ± π + π – and B ± →K ± K + K – decays, while the CP asymmetry of B ± →K ± π + π – decays is confirmed to be compatible with zero. The distributions of these asymmetries are also studied as a function of the three-body phase space and suggest contributions from rescattering and resonance interference processes. An indication of the presence of the decays B ± →π ± χ c0 (1P) in both B ± →π ± π + π – and B ± →π ± K + K – decays is observed, as is CP violation involving these amplitudes.