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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.
Projection scheme for handling large-number cancellation related to gauge invariance
Source PublicationPHYSICAL REVIEW D
KeywordTop-quark Production Unstable Particles High-energy Collisions Boson Lep200
AbstractA 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.
1996
ISSN0556-2821
Volume54Issue:11Pages:6963-6969
Subject AreaPhysics
Indexed BySCI
Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/12554
Collection理论物理所科研产出_SCI论文
Corresponding AuthorChang, CH , CHINA CTR ADV SCI & TECHNOL,WORLD LAB,POB 8730,BEIJING 100080,PEOPLES R CHINA.
Recommended Citation
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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