Next-to-leading order QCD corrections to the top quark decay via the flavor-changing neutral-current operators with mixing effects

被引：24

作者：

Zhang, Jia Jun ^{[1
,2
]}

Li, Chong Sheng ^{[1
,2
,3
]}

Gao, Jun ^{[1
,2
]}

Zhu, Hua Xing ^{[1
,2
]}

Yuan, C. -P. ^{[4
]}

Yuan, Tzu-Chiang ^{[5
]}

机构：

[1] Peking Univ, Dept Phys, Beijing 100871, Peoples R China

[2] Peking Univ, State Key Lab Nucl Phys & Technol, Beijing 100871, Peoples R China

[3] Peking Univ, Ctr High Energy Phys, Beijing 100871, Peoples R China

[4] Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA

[5] Acad Sinica, Inst Phys, Taipei 11529, Taiwan

来源：

PHYSICAL REVIEW D | 2010年 / 82卷 / 07期

基金：

中国国家自然科学基金; 美国国家科学基金会;

关键词：

SEARCH; COLLISIONS;

D O I：

10.1103/PhysRevD.82.073005

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Detailed calculations of the complete O(alpha(s)) corrections to the top-quark decay widths Gamma(t -> q + V) with V = g, gamma, Z, and q = u, c are presented. Besides describing in detail the calculations in our previous work [Phys. Rev. Lett. 102, 072001 (2009)], we also include the mixing effects of the flavor-changing neutral-current operators for t -> q + gamma and t -> q + Z, which were not considered previously. We show that the mixing effects can either be large or small depending on the values of various anomalous couplings and thereby increase or decrease the branching ratios for t -> q + gamma and t -> q + Z.

引用

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