Extraction of the CKM phase γ from the charmless two-body B meson decays

Using all experimentally measured charmless B -> PP, PV decay modes, where P(V) denotes a light pseudoscalar (vector) meson, we extract the CKM angle gamma by a global fit. All hadronic parameters are determined from the experimental data, such that the approach is least model dependent. The contributions of the various decay modes are classified by the topological weak Feynman diagram amplitudes, which are determined by the global fit. To improve the precision of the approach, we consider the flavor SU(3) breaking effects of the topological diagram amplitudes of the decay modes by including the form factors and decay constants. The fit result for the CKM angle gamma is (69.8 +/- 2.1 +/- 0.9)degrees. It is consistent with the current world average values but has a smaller uncertainty.