Annihilation contributions and CP asymmetries in B+->pi K-+(0), (K+K0) and B-0 -> K-0(K)over-bar(0)

作者：Hao Xi Qing^*; He Xiao Gang; Li Xue Qian

来源：Physical Review D - Particles, Fields, Gravitation and Cosmology, 2007, 75(3): 037501.

DOI：10.1103/PhysRevD.75.037501

Recently the branching ratios for B+-> K+(K) over bar (0) and B-0 -> K-0(K) over bar (0) have been measured. Data indicate that the annihilation amplitudes in these decays are not zero. A nonzero annihilation amplitude plays an important role in CP violation for B+->pi K-+(0), K+(K) over bar (0). Using the measured branching ratios for these decays, we show that there is an absolute bound of 5% for the size of CP asymmetry in B+->pi K-+(0) from a relation between the amplitudes of these decays. The size of CP asymmetry in B+-> K+(K) over bar (0) can, however, be as large as 90%. Future experimental data will test these predictions.

• 出版日期2007-2
• 单位南开大学