Revisiting nonfactorizable contributions to factorization-forbidden decays of B mesons to charmonium

• 来源期刊: 中国物理C（英文版）
• 年，卷（期）: 2020,（11）
• 所属期刊栏目: PARTICLES AND FIELDS
• 页码范围: 62-69
• 页数: 8页
• 语种: 英文
• DOI: 10.1088/1674-1137/abae50

摘要

Motivated by the large rates of B→*(Xc0,Xc2,hc)K decays observed by the BABAR and Belle collabora-tions,we investigate the nonfactorizable contributions to these factorization-forbidden decays,which can occur through a gluon exchange between the cc system and the spectator quark.Our numerical results demonstrate that the spectator contributions are capable of producing a large branching ratio consistent with the experiments.As a by-product,we also study the Cabibbo-suppressed decays,such as B →(Xc0,Xc2,hc)π and the U-spin-related Bs decay,which have so far received less theoretical and experimental attention.The calculated branching ratios reach the or-der of 10-6,which is within the scope of the Belle-Ⅱ and LHCb experiments.Further,the CP-asymmetry parameters are also calculated for these decays.The obtained results are compared with the available experimental data and num-bers from other predictions.We also investigate the sources of theoretical uncertainties in our calculation.