Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2000-06-24
Phys.Rev. D62 (2000) 116004
Physics
High Energy Physics
High Energy Physics - Phenomenology
RevTex, 24 pages, 6 figures, minor changes, version to appear in PRD
Scientific paper
10.1103/PhysRevD.62.116004
We consider the partial rate asymmetry in the inclusive decay modes b to s gamma and b to d gamma, concentrating on non-standard models with new charged Higgs interactions. We find that the charged Higgs contribution to the asymmetry for b to s gamma is small in such models due to a universal cancellation mechanism. The asymmetry is therefore difficult to distinguish experimentally from the Standard Model (SM) value, which is also small. The cancellation mechanism is found to be rendered inoperative in supersymmetry due to the presence of chargino loops. Unlike b to s gamma, the rate asymmetry for b to d gamma in Higgs models can be quite different from its SM value, generally ranging from -20% to +20%. Specific model calculations are performed for the Three-Higgs Doublet Model and the ``Top'' Two-Higgs Doublet Model to serve as illustrations. We also offer some suggestions that may be helpful to experimentalists in the detection of the inclusive mode b to d gamma.
Kiers Ken
Soni Amarjit
Wu Guo-Hong
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