期刊
PHYSICAL REVIEW D
卷 91, 期 11, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.91.114003
关键词
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资金
- National Science Foundation [PHY-1417028]
- Division Of Physics
- Direct For Mathematical & Physical Scien [1068369, 1417028] Funding Source: National Science Foundation
I provide a calculation at full two-loop order of the complex pole squared mass of the W boson in the Standard Model in the pure (MS) over bar renormalization scheme, with Goldstone boson mass effects resummed. This approach is an alternative to earlier ones that use on-shell or hybrid renormalization schemes. The renormalization scale dependence of the real and imaginary parts of the resulting pole mass is studied. Both deviate by about +/- 4 MeV from their median values as the renormalization scale is varied from 50 to 200 GeV, but the theory error is likely larger. A surprising feature of this scheme is that the two-loop QCD correction has a larger scale dependence, but a smaller magnitude, than the two-loop non-QCD correction, unless the renormalization scale is chosen very far from the top-quark mass.
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