Gluino Contribution to Radiative B Decays: Organization of QCD Corrections and Leading Order Results

TL;DR

This paper analyzes how gluino contributions affect the decay b-> s gamma within supersymmetric models, emphasizing the importance of QCD corrections and operator basis expansion for accurate predictions and constraints.

Contribution

It introduces the organization of QCD corrections and leading order results for gluino-induced contributions to radiative B decays in supersymmetry.

Findings

QCD corrections significantly modify gluino contributions

Operator basis expands to include magnetic, chromomagnetic, and four-quark operators

Constraints on supersymmetric flavor violation sources are derived

Abstract

The gluino-induced contributions to the decay b-> s gamma are investigated in supersymmetric frameworks with generic sources of flavour violation. It is shown that, when QCD corrections are taken into account, the relevant operator basis of the Standard Model effective Hamiltonian gets enlarged to contain: i) magnetic and chromomagnetic operators with a factor of alpha_s and weighted by a quark mass m_b or m_c; ii) magnetic and chromomagnetic operators of lower dimensionality, also containing alpha_s; iii) four-quark operators weighted by a factor alpha_s^2. Numerical results are given, showing the effects of the leading order QCD corrections on the inclusive branching ratio for b-> s gamma. Constraints on supersymmetric sources of flavour violation are derived.