Fragmentation fractions of two-body b-baryon decays

被引：23
作者：
Hsiao, Y. K. [1 ,2 ,3 ]
Lin, P. Y. [4 ]
Luo, L. W. [5 ]
Geng, C. Q. [1 ,2 ,3 ]
机构：
[1] Chongqing Univ Posts & Telecommun, Chongqing 400065, Peoples R China
[2] Natl Ctr Theoret Sci, Div Phys, Hsinchu 300, Taiwan
[3] Natl Tsing Hua Univ, Dept Phys, Hsinchu 300, Taiwan
[4] Natl Chiao Tung Univ, Dept Electrophys, Hsinchu 300, Taiwan
[5] Natl Chiao Tung Univ, Inst Phys, Hsinchu 300, Taiwan
来源：
PHYSICS LETTERS B | 2015年 / 751卷
关键词：
BOTTOM;
D O I：
10.1016/j.physletb.2015.10.013
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We study the fragmentation fractions (f(Bb)) of the b-quark to b-baryons (B-b). By the assumption of f(Lambda b)/(f(u) + f(d)) = 0.25 +/- 0.15 in accordance with the measurements by LEP, CDF and LHCb Collaborations, we estimate that f(Lambda b)= 0.175 +/- 0.106 and f(Xi b)(-),0 = 0.019 +/- 0.013. From these fragmentation fractions, we derive B(Lambda(b) -> J/psi Lambda) =(3.3 +/- 2.1) x10(-4), B(Xi(-)(b) -> J/psi Xi(-)) = (5.3 +/- 3.9) x10(-4) and B(Omega(-)(b) -> J/psi Omega(-)) > 1.9 x10(-5). The predictions of B(Lambda(b) -> J/psi Lambda) and B(Xi(-)(b) -> J/psi Xi(-)) clearly enable us to test the theoretical models, such as the QCD factorization approach in the b-baryon decays. (C) 2015 The Authors. Published by Elsevier B.V.
引用
收藏
页码：127 / 130
页数：4
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