Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-07-28
Phys.Rev.Lett.93:201805,2004
Physics
High Energy Physics
High Energy Physics - Phenomenology
4 pages, 2 figures
Scientific paper
10.1103/PhysRevLett.93.201805
We 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.
Awramik M.
Czakon Michael
Freitas Ayres
Weiglein Georg
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