Implications of isospin conservation in Λb decays and lifetime

被引：6
|
作者：
Datta, A [1 ]
Lipkin, HJ
O'Donnell, PJ
机构：
[1] Univ Toronto, Dept Phys & Astron, Toronto, ON, Canada
[2] Weizmann Inst Sci, Dept Particle Phys, IL-76100 Rehovot, Israel
[3] Tel Aviv Univ, Sch Phys & Astron, IL-69978 Tel Aviv, Israel
来源：
PHYSICS LETTERS B | 1999年 / 450卷 / 1-3期
基金：
加拿大自然科学与工程研究理事会;
关键词：
D O I：
10.1016/S0370-2693(99)00139-2
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We consider isospin predictions for the semi-leptonic and non-leptonic decays of the Lambda(b) baryon. Isospin conservation of the strong interactions constrains the possible final states in Lambda(b) decays. Since the baryon hyperfine splittings depend upon light quark dynamics and do not decrease with increasing heavy quark mass, this leads in general to to phase space enhancements in Lambda(b) decays relative to B meson decays for the same underlying quark transitions, Consequently the Lambda(b) lifetime is smaller than the B lifetime. Phase space enhancements in Lambda(b) decays relative to B decays can he understood in terms of hyperfine interactions in the heavy quark system. (C) 1999 Published by Elsevier Science B.V. All rights reserved.
引用
收藏
页码：250 / 256
页数：7
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