Welcome To The CPV Group
This group primarily focuses on the measurement of the branching ratio of a very special rare kaon decay, a k-long particle decays into a neutral pion and two neutrinos (so called the "golden" mode). This decay mode provides the cleanest and best answer to the question of CP violation in elementary particle physics that the theoretical calculation (prediction) within the so called Standard Model is unambiguous and precise. Therefore no matter what the measurement result is, standard or non-standard; it will be most fascinating.
Physics Motivation
CP violation is currently recognized as one of the most forefront issues in elementary particle physics. Together with obtaining a better understanding of quark mixing as well as neutrino mixing phenomena, it is one of the central goals of particle physics, and has been pursued vigorously in many experiments. The large number of experiments and theory papers, particularly for B mesons, illustrates the intense interest in CP violation. Out of myriad of ways to study CP violation, there are four “golden” processes: asymmetries in 
decays, the ratio of Bs to Bd mixing, and the decays 
and 
The very rare decay 
provides one of the best probes for understanding the original of CP violation in the quark sector. It is an FCNC process that is induced through a 
transition as expressed by the electroweak penguin and box diagrams as show in Figure 1. Long-distance contributions have been shown to be negligible. Theoretical uncertainties are extremely small in the Standard Model calculations.
