Abstract： The direct CP-violating asymmetries for the penguin-dominated b → sg, b → sγ, and b → sl+l- decays are reexamined using the generalized 4x 4 Kobayashi-Maskawa matrix proposed by Bjorken. We find that the fourth generation effect on these asymmetries are significantly constrained by the sign of sin Ф3/ sin Ф1, the imaginary part of the loop integral function for c-quark Im(Ic) , and the mass of t'-quark. Most of the previous predictions for this effect are too optimistic.
(Charge conjugation, parity, time reversal, and other discrete symmetries)
引用本文:
XING Zhizhong;DU Dongsheng. Constraints on Violation in the Fourth Generation Effect on CP
Penguin-Dominated b → s Decays
[J]. 中国物理快报, 1992, 9(1): 9-12.
XING Zhizhong, DU Dongsheng. Constraints on Violation in the Fourth Generation Effect on CP
Penguin-Dominated b → s Decays
. Chin. Phys. Lett., 1992, 9(1): 9-12.
1992, Vol. 9 
