Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-11-04
Phys.Rev.D62:075005,2000
Physics
High Energy Physics
High Energy Physics - Phenomenology
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.
Borzumati Francesca
Greub Christoph
Hurth Tobias
Wyler Daniel
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