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

作　　者：Si-Hong Zhou Cai-Dian Lü 周四红;吕才典(School of Physical Science and Technology,Inner Mongolia University,Hohhot 010021,China;Institute of High Energy Physics,CAS,Beijing 100049,China;School of Physics,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]School of Physical Science and Technology,Inner Mongolia University,Hohhot 010021,China [2]Institute of High Energy Physics,CAS,Beijing 100049,China [3]School of Physics,University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Chinese Physics C》2020年第6期12-19,共8页中国物理C（英文版）

基　　金：Supported by National Science Foundation of China(11847040,11947414,11521505,11621131001);Scientific Research Foundation of Inner Mongolia University。

摘　　要：Using all experimentally measured charmless B → PP, PV decay modes, where P(V) denotes a light pseudoscalar(vector) meson, we extract the CKM angle γ 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 γ is( 69.8 ± 2.1 ± 0.9)°. It is consistent with the current world average values but has a smaller uncertainty.

关 键 词：CKM phase charmless two-body B meson decays global fit 

分 类 号：O572.33[理学—粒子物理与原子核物理]