Complete two loop bosonic contributions to the muon lifetime in the standard model

被引:88
作者
Awramik, M
Czakon, M
机构
[1] Univ Karlsruhe, Inst Theroet Teilchenphys, D-76128 Karlsruhe, Germany
[2] Univ Karlsruhe, Inst Theoret Phys, D-76128 Karlsruhe, Germany
[3] Silesian Univ, Inst Phys, Dept Field Theory & Particle Phys, PL-40007 Katowice, Poland
关键词
D O I
10.1103/PhysRevLett.89.241801
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
The last missing correction to the muon lifetime in the standard model at O(alpha(2)) coming from gauge and Higgs boson loops is presented. The associated contribution to the parameter Deltar in the on-shell scheme ranges from 6x10(-5) to -4x10(-5) for Higgs boson masses from 100 GeV to 1 TeV. This result translates into a shift of the W boson mass which does not exceed +/-1 MeV in the same range and amounts, in particular, to approximately -0.8 MeV for a 115 GeV Higgs boson.
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页数:4
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