Bosonic Corrections to The Effective Weak Mixing Angle at O(alpha^2)

Details Bosonic Corrections to The Effective Weak Mixing Angle at O(alpha^2) Bosonic Corrections to The Effective Weak Mixing Angle at O(alpha^2)

2006-05-31

arxiv.org/abs/hep-ph/0605339v1

Phys.Lett. B642 (2006) 563-566

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages, 1 figure

Scientific paper

10.1016/j.physletb.2006.07.035

We present the complete bosonic contributions to the effective weak mixing angle, $\seff$, at the two-loop level in the electroweak interactions. We find their size to be about three times smaller than inferred from simple estimates from lower orders. In particular, for a Higgs boson mass, $M_H$, of 100 GeV they amount to $4 \times 10^{-6}$, and drop down by about an order of magnitude for $M_H = 200$ GeV. We estimate the intrinsic error of the theory prediction of $\seff$ to be $4.7 \times 10^{-5}$.

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