Complete two-loop electroweak fermionic corrections to the effective leptonic weak mixing angle sin.(²θlepteff and Indirect Determination of the Higgs Boson Mass

Awramik, M.; Czakon, M.; Freitas, A.; Weiglein, G.

doi:10.1103/physrevlett.93.201805

Complete two-loop electroweak fermionic corrections to the effective leptonic weak mixing angle sin.(²θlepteff and Indirect Determination of the Higgs Boson Mass

Awramik, M.; Czakon, M.; Freitas, A.; Weiglein, G.

Authors

M. Awramik

M. Czakon

A. Freitas

Dr Georg Weiglein georg.weiglein@durham.ac.uk
Academic Visitor

Abstract

We present a complete calculation of the contributions to the effective leptonic weak mixing angle, sin2, generated by closed fermion loops at the two-loop level of the electroweak interactions. This quantity is the source of the most stringent bound on the mass MH of the standard model Higgs boson. The size of the corrections with respect to known partial results varies between –4×10–5 and –8×10–5 for a realistic range of MH from 100 to 300 GeV. This translates into a shift of the predicted (from sin2 alone) central value of MH by +19 GeV, to be compared with the shift induced by a recent change in the measured top quark mass which amounts to +36 GeV.

Citation

Awramik, M., Czakon, M., Freitas, A., & Weiglein, G. (2004). Complete two-loop electroweak fermionic corrections to the effective leptonic weak mixing angle sin.(²θlepteff and Indirect Determination of the Higgs Boson Mass. Physical Review Letters, 93(20), 201805-1. https://doi.org/10.1103/physrevlett.93.201805

Journal Article Type	Article
Publication Date	2004-11
Deposit Date	Jan 9, 2009
Publicly Available Date	Sep 10, 2010
Journal	Physical Review Letters
Print ISSN	0031-9007
Electronic ISSN	1079-7114
Publisher	American Physical Society
Peer Reviewed	Peer Reviewed
Volume	93
Issue	20
Pages	201805-1
DOI	https://doi.org/10.1103/physrevlett.93.201805
Keywords	Quark mass, Unified field theories, Higgs bosons, Intermediate boson mass, Standard model.