Search

CP violation in the charm quark sector has not been examined very well as the case for strange and beauty ones. Some novel insights into the issue on the CP violation in D meson decay are discussed. Specifically, i) the T-violating observables in D → VV decays are constructed. Assuming CPT invariance T violation implies CP violation. This is a new idea and an alternative way for probing CP violation in D decays; ii) the decay of quantum correlated DD pair to vector mesons (denoted by V) is explored, which offers the new CP violating observables that have not been noticed before

Searching for the New Physics (NP) phenomenon beyond Standard Model (SM) is still a main focus in particle physics. Here we propose to search for Λ — oscillation in the decay J/ψ → Λ AA using BES detector. With one-year luminosity at BESIII, we can put a constraint that the Λ — oscillation mass is smaller than 10-15 MeV at 90% confidence level, corresponding to the oscillation time of 10-6 second around, in case of non-observation of any signals. These measurements should provide very precious informations besides the neutron oscillation experiment. Also it would be the first-time access by experiment for Λ — oscillation.