Two - loop heavy top corrections to the b → sγ decay
نویسنده
چکیده
We compute the two-loop corrections to the coefficient of the b → sγ magnetic penguin present in the limits of heavy top and/or heavy higgs. This kind of corrections affects in a significant way the observables measured at LEP. On the contrary we find that, due to a numerical accident, the correction to BR(B → Xsγ) is negligible (below the 1% level for any possible value of the higgs mass) when the leading order result is expressed in the usual way in terms of the semileptonic BR(B → Xcēν).
منابع مشابه
Two - loop QCD corrections to charged - Higgs - mediated b → sγ decay
The charged-Higgs-mediated contribution to the Wilson coefficient of the b → sγ magnetic penguin is expected to be one of the more promising candidates for a supersymmetric effect in B physics, probably the only one in gauge-mediated models. We compute the two-loop QCD correction to it. With näıve dimensional regularization and MS subtraction, for reasonable values of the charged Higgs mass and...
متن کاملConstraints on SUSY - GUT unification from b → sγ decay
The top-quark Yukawa infrared fixed-point solution of the renormalization group equations, with minimal supersymmetry and GUT unification, defines a low-energy spectrum of supersymmetric particle masses in terms of a few GUT-scale parameters assuming universal boundary conditions. We give predictions in this model for the inclusive b → sγ branching fraction and investigate the impact of non-uni...
متن کاملElectroweak radiative corrections to b → sγ
Two loop electroweak corrections to b → sγ decays are computed. Fermion and photonic loop effects are found to reduce R ≡ B(b → sγ)/B(b → ceν) by ∼ 8 ± 2% and lead to the standard model prediction B(B → Xsγ) = 3.28 ± 0.30 × 10 for inclusive B meson decays. Comparison of R = 3.04± 0.25× 10(1+0.10ρ), where ρ is a Wolfenstein CKM parameter, with the current experimental average R = 2.52±0.52×10−3 ...
متن کاملRadiative Corrections in Susy Phenomenology *
We discuss some aspects of the radiative corrections in the phenomenology of the minimal SUSY standard model, by reviewing two recent studies. (1) The full one-loop corrections to the Higgs boson decays into charginos are presented, with emphasis on the renormalization of the chargino sector, including of their mixing matrices. (2) The two-loopO(αs tanβ) corrections to the b → sγ decay in model...
متن کاملhep-ph/9808412 Charged Higgs Mass Bounds from b → sγ in a Bilinear R-Parity Violating Model
The experimental measurement of B(b → sγ) imposes important constraints on the charged Higgs boson mass in the MSSM. If squarks are in the few TeV range, the charged Higgs boson mass in the MSSM must satisfy mH± ∼440 GeV. For lighter squarks, then light charged Higgs bosons can be reconciled with B(b → sγ) only if there is also a light chargino. In the MSSM if we impose m χ ± 1 > 90 GeV then we...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 1998