Bosonic Corrections to The Effective Weak Mixing Angle at O(α)
نویسندگان
چکیده
We present the complete bosonic contributions to the effective weak mixing angle, sin θ lept eff , 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, MH , of 100 GeV they amount to 4 × 10 −6, and drop down by about an order of magnitude for MH = 200 GeV. We estimate the intrinsic error of the theory prediction of sin θ lept eff to be 4.7 × 10 −5.
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