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

Physics – High Energy Physics – High Energy Physics - Phenomenology

Scientific paper

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36 pages including 16 postscript figures; uses epsf; journal version: one ref. added; rephrasing of a couple of paragraphs

Scientific paper

10.1103/PhysRevD.62.075005

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.

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