Heavy fermions and two loop electroweak corrections to b → s + γ

Applying effective Lagrangian method and on-shell scheme, we analyze the electroweak corrections to the rare decay b → s + γ from some special two loop diagrams in which a closed heavy fermion loop is attached to the virtual charged gauge bosons or Higgs. At the decoupling limit where the virtual fe...

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Bibliographic Details
Published in:The journal of high energy physics 2010-05, Vol.2010 (5), Article 59
Main Authors: Yang, Xiu-Yi, Feng, Tai-Fu
Format: Article
Language:English
Subjects:
Bosons
Classical and Quantum Gravitation
Couplings
Decoupling
Elementary Particles
Fermions
High energy physics
Physics
Physics and Astronomy
Quantum Field Theories
Quantum Field Theory
Quantum Physics
Relativity Theory
String Theory
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Summary:Applying effective Lagrangian method and on-shell scheme, we analyze the electroweak corrections to the rare decay b → s + γ from some special two loop diagrams in which a closed heavy fermion loop is attached to the virtual charged gauge bosons or Higgs. At the decoupling limit where the virtual fermions in inner loop are much heavier than the electroweak scale, we verify the final results satisfying the decoupling theorem explicitly when the interactions among Higgs and heavy fermions do not contain the nondecoupling couplings. Adopting the universal assumptions on the relevant couplings and mass spectrum of new physics, we find that the relative corrections from those two loop diagrams to the SM theoretical prediction on the branching ratio of B → X s γ can reach 5% as the energy scale of new physics Λ NP = 200GeV.
ISSN:1029-8479
1029-8479
DOI:10.1007/JHEP05(2010)059