LHCb collaboration has recently announced a measurement of the difference of time-integrated CP asymmetries between D→K+K− and D→π+π−. This result provides the evidence of large direct CP violation in D meson and reveals some important implications on underlying new physics. It is shown that the direct CP violation in D meson can be enhanced by R-parity violating supersymmetry, while CP violations in K and B mesons are suppressed by this new physics, which is in consistence with previous experiments. Constraints on the model parameters and some consequences are also discussed.
@article{arxiv.1201.2565,
title = {LHCb $\bigtriangleup A_{CP}$ of $D$ meson and R-Parity Violation},
author = {Xue Chang and Ming-Kai Du and Chun Liu and Jia-Shu Lu and Shuo Yang},
journal= {arXiv preprint arXiv:1201.2565},
year = {2012}
}