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

页码：127 / 130

页数：4

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