Top-Quark Decay at Next-to-Next-to-Leading Order in QCD

被引：145
|
作者：
Gao, Jun [1 ]
Li, Chong Sheng [2 ,3 ,4 ]
Zhu, Hua Xing [5 ]
机构：
[1] So Methodist Univ, Dept Phys, Dallas, TX 75275 USA
[2] Peking Univ, Dept Phys, Beijing 100871, Peoples R China
[3] Peking Univ, State Key Lab Nucl Phys & Technol, Beijing 100871, Peoples R China
[4] Peking Univ, Ctr High Energy Phys, Beijing 100871, Peoples R China
[5] Stanford Univ, SLAC Natl Accelerator Lab, Stanford, CA 94309 USA
来源：
PHYSICAL REVIEW LETTERS | 2013年 / 110卷 / 04期
基金：
中国国家自然科学基金;
关键词：
NNLO CALCULATION; PHOTON ENERGY; 2-LOOP RESULT; FACTORIZATION; CUT;
D O I：
10.1103/PhysRevLett.110.042001
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We present the complete calculation of the top-quark decay width at next-to-next-to-leading order in QCD, including next-to-leading electroweak corrections as well as finite bottom quark mass and W boson width effects. In particular, we also show the first results of the fully differential decay rates for the top-quark semileptonic decay t -> W+(l(+)nu)b at next-to-next-to-leading order in QCD. Our method is based on the understanding of the invariant mass distribution of the final-state jet in the singular limit from effective field theory. Our result can be used to study arbitrary infrared-safe observables of top-quark decay with the highest perturbative accuracy. DOI: 10.1103/PhysRevLett.110.042001
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收藏
页数：5
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