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Projection scheme for handling large-number cancellation related to gauge invariance
Chang, CH; Ding, YB; Li, XQ; Wang, JX; Zhu, JJ; Chang, CH , CHINA CTR ADV SCI & TECHNOL,WORLD LAB,POB 8730,BEIJING 100080,PEOPLES R CHINA.
1996
发表期刊PHYSICAL REVIEW D
ISSN0556-2821
卷号54期号:11页码:6963-6969
摘要A scheme, the so-called ''projection,'' for handling singularities in processes such as e(+)e(-) --> t(b) over bare$(-)<(nu)over bar> (or e(+)e(-) --> u(d) over bare$(-)<(nu)over bar>) is proposed. In the scheme, with the help of gauge invariance, the large power quantities (s/m(e)(2))(n) (n greater than or equal to 1; s --> infinity) are removed from the calculation totally, while in the usual schemes the large quantities appear and only will be canceled at last. The advantages of the scheme in numerical calculations are obvious; thus, we focus our discussions mainly on the advantages of the scheme in the special case where the absorptive part for some propagators relevant to the process could not be ignored, and a not satisfactory but widely adopted approximation is made; i.e., a finite constant ''width'' is introduced to approximate the absorptive part of the propagators phenomenologically even though QED gauge invariance is violated.
部门归属ACAD SINICA,INST THEORET PHYS,BEIJING 100080,PEOPLES R CHINA; ACAD SINICA,GRAD SCH,PHYS BRANCH,BEIJING 100039,PEOPLES R CHINA; NANKAI UNIV,DEPT PHYS,TIANJIN 300071,PEOPLES R CHINA; INST HIGH ENERGY PHYS,BEIJING 100039,PEOPLES R CHINA
关键词Top-quark Production Unstable Particles High-energy Collisions Boson Lep200
学科领域Physics
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收录类别SCI
文献类型期刊论文
条目标识符http://ir.itp.ac.cn/handle/311006/12554
专题理论物理所1978-2010年知识产出
通讯作者Chang, CH , CHINA CTR ADV SCI & TECHNOL,WORLD LAB,POB 8730,BEIJING 100080,PEOPLES R CHINA.
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GB/T 7714
Chang, CH,Ding, YB,Li, XQ,et al. Projection scheme for handling large-number cancellation related to gauge invariance[J]. PHYSICAL REVIEW D,1996,54(11):6963-6969.
APA Chang, CH,Ding, YB,Li, XQ,Wang, JX,Zhu, JJ,&Chang, CH , CHINA CTR ADV SCI & TECHNOL,WORLD LAB,POB 8730,BEIJING 100080,PEOPLES R CHINA..(1996).Projection scheme for handling large-number cancellation related to gauge invariance.PHYSICAL REVIEW D,54(11),6963-6969.
MLA Chang, CH,et al."Projection scheme for handling large-number cancellation related to gauge invariance".PHYSICAL REVIEW D 54.11(1996):6963-6969.
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