Complete Two-Loop Electroweak Fermionic Corrections to sin^2(theta_eff) and Indirect Determination of the Higgs Boson Mass

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dc.creatorAwramik, M.
dc.creatorCzakon, M.
dc.creatorFreitas, A.
dc.creatorWeiglein, G.
dc.date2004-07-28
dc.date.accessioned2026-07-07T10:49:11Z
dc.date.available2026-07-07T10:49:11Z
dc.descriptionWe present a complete calculation of the contributions to the effective leptonic weak mixing angle, sin^2theta_eff, 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, M_H, of the only undiscovered particle of the Standard Model, the 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 M_H from 100 to 300 GeV. This translates into a shift of the predicted (from sin^2theta_eff alone) central value of M_H 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. Our result, together with all other known corrections is given in the form of a precise fitting formula to be used in the global fit to the electroweak data.
dc.description4 pages, 2 figures
dc.identifierhttps://arxiv.org/abs/hep-ph/0407317
dc.identifierhttp://arxiv.org/abs/hep-ph/0407317
dc.identifierPhys.Rev.Lett.93:201805,2004
dc.identifierdoi:10.1103/PhysRevLett.93.201805
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/184134
dc.subjectHigh Energy Physics - Phenomenology
dc.titleComplete Two-Loop Electroweak Fermionic Corrections to sin^2(theta_eff) and Indirect Determination of the Higgs Boson Mass
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