Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2000-07-24
JHEP 0009 (2000) 001
Physics
High Energy Physics
High Energy Physics - Phenomenology
15 pages, 3 figures
Scientific paper
10.1088/1126-6708/2000/09/001
We compute the two-loop electroweak corrections to the radiative decays of the B meson in the SM. Electroweak effects reduce the Wilson coefficient C_7^eff(mw) by 2.6% for a light Higgs boson of about 100 GeV and are less important for a heavier Higgs. The leading term of a heavy top expansion of our result differs from the one obtained in the gaugeless approximation where only top quark Yukawa couplings are considered: we discuss the origin of the discrepancy and provide a criterion for the validity of the gaugeless approximation. As a byproduct of the calculation we also obtain the O(alpha) corrections to the Wilson coefficient of the four-fermion operator Q_2. A careful analysis of the interplay between electroweak and QCD effects leads to an overall 2% reduction of the total branching ratio for B -> X_s gamma due to purely electroweak corrections. For a light Higgs boson, the up-to-date SM prediction is BR_gamma=3.29 10^-4.
Gambino Paolo
Haisch Ulrich
No associations
LandOfFree
Electroweak effects in radiative B decays does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Electroweak effects in radiative B decays, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electroweak effects in radiative B decays will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-106260