1202.3042 (Yu-Ping Kuang et al.)

Testing Anomalous Color-Electric Dipole Moment of the c-Quark from
psi'->J/psi+pi(+)+pi(-) at Beijing Spectrometer    [PDF]

Yu-Ping Kuang, Jian-Ping Ma, Otto Nachtamnn, Wan-Peng Xie, Hui-Huo Zheng

If the c-quark has an anomalous color-electric dipole moment (CEDM), it may
serve as a new source of CP violation. The strength of such a CP violation
depends on the size of the CEDM, d'_c. We propose two effective ways of testing
it from the large sample of psi'->J/psi+pi(+)+pi(-) at the Beijing
Spectrometer, and the obtained result, |d'_c|<3X10^{-14} e cm (95% C.L.), gives
the first experimentally determined upper bound on the CEDM of the c quark.

View original: http://arxiv.org/abs/1202.3042