Speaker
鄭 海揚
(中央研究院物理研究所)
Description
In 2012 Cheng-Wei Chiang and I have studied direct CP violation in singly Cabibbo-suppressed D decays within the topological diagram approach. We concluded that the direct CP asymmetry difference \Delta A_{CP} between D0 -> K+ K- and D0 -> pi+ pi- is about (-0.139+/- 0.004)\% and (-0.151+/-0.004)\% for the two solutions of W-exchange amplitudes, respectively. The first observation of CP violation in the charm sector was recently announced by LHCb with the result \Delta A_{CP}=(-0.154+/-0.029)\%. This is a great triumph of the standard model. In this talk I'll discuss its implications and present new predictions in other D -> PP and VP modes (P: pseudoscalar meson, V: vector meson).
