THE DECAY-RATE ASYMMETRY OF THE TOP-QUARK

被引：35
作者：
GRZADKOWSKI, B [1 ]
KEUNG, WY [1 ]
机构：
[1] CERN,DIV THEORY,CH-1211 GENEVA 23,SWITZERLAND
来源：
PHYSICS LETTERS B | 1993年 / 319卷 / 04期
关键词：
D O I：
10.1016/0370-2693(93)91761-B
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The asymmetries A(k) = [GAMMA(t --> W+d(k))-GAMMA(tBAR --> W-d(k)BAR)]/[GAMMA(t --> W+d(k))+GAMMA(tBAR --> W-d(k)BAR)] in the partial widths of the top quark decays are discussed within the Standard Model (SM), the Two-Higgs-Doublet Model (2HDM) and supersymmetric extensions of the SM (SSM). The leading contributions to these asymmetries in the SM and in the 2HDM are induced by the up-type quark self-energy diagrams and are found to be very small. However, in the SSM, the asymmetry A(b) can be substantial, O (alpha(QCD)), provided the CP-violating phase of gluino-top-stop couplings is not suppressed. Within the SSM A(b) is generated by the vertex corrections.
引用
收藏
页码：526 / 532
页数：7
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