$b \to s l \bar l $ in the minimal supergravity model

Details $b \to s l \bar l $ in the minimal supergravity model $b \to s l \bar l $ in the minimal supergravity model

1996-09-28

arxiv.org/abs/hep-ph/9609512v1

Phys.Rev. D55 (1997) 4273-4289; Erratum-ibid. D66 (2002) 019901

Physics

High Energy Physics

High Energy Physics - Phenomenology

LaTeX, 52 pages including figures

Scientific paper

10.1103/PhysRevD.66.019901

The $b \rightarrow s l^+ l^-$ process is studied in the minimal supergravity model in detail. Taking account of the long distance contributions from the $c\overline{c}$ resonances, we calculate the branching ratio and the lepton forward-backward asymmetry in this model. We find that there is a strong correlation between the branching ratios of $b \rightarrow s \gamma$ and $b \rightarrow s l^+ l^-$ processes and that the interference effect can change the $b \rightarrow s l^+ l^-$ branching ratio in the off-resonance regions by up to $\pm 15%$ depending on the relative phase between the long and short distance contributions. Using various phenomenological constraints including the branching ratio of $b \rightarrow s \gamma$, we show that there are regions in the parameter space where the branching ratio of $b \rightarrow s l^+ l^-$ is enhanced by about 50% compared to the SM. We also show that the branching ratio of $b \rightarrow s \nu{\overline \nu}$ is reduced at most by 10% from the SM prediction.

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