Relativistic corrections to the form factors of Bc into S-wave charmonium

被引：36

作者：

Zhu, Ruilin ^{[1
]}

Ma, Yan

Han, Xin-Ling

Xiao, Zhen-Jun ^{[1
]}

机构：

[1] Nanjing Normal Univ, Dept Phys, Nanjing 210023, Jiangsu, Peoples R China

来源：

PHYSICAL REVIEW D | 2017年 / 95卷 / 09期

基金：

中国国家自然科学基金;

关键词：

SEMILEPTONIC DECAYS; SUM-RULES; QCD; MESON;

D O I：

10.1103/PhysRevD.95.094012

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We investigate the form factors of B-c meson into S-wave charmonium within the nonrelativistic QCD effective theory and obtain the next-to-leading order relativistic corrections to the form factors, where both the B-c meson and the charmonium are treated as the nonrelativistic bound states. Treating the charm quark as a light quark in the limit m(c)/m(b) -> 0, some form factors are identical at the maximum recoil point, which are consistent with the predictions in the heavy-quark effective theory and the large-energy effective theory. Considering that the branching ratios of B-c(+) -> J/psi D-s(+) and B-c(+) -> J/psi D-s*(+) have been measured by the LHCb and ATLAS Collaborations recently, we employ the form factors of B-c meson into S-wave charmonium at the next-to-leading order accuracy to these two decay channels and obtain more precise predictions of their decay rates. Numerical results indicate that the factorizable diagrams dominate the contribution in these two channels, while the color-suppressed and the annihilation diagrams contribute less than 10 percent. Our results are consistent with the LHCb and ATLAS data.

引用

页数：10

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