$B\to K^*\ell^+\ell^-$ Forward-backward Asymmetry and New Physics

Details $B\to K^*\ell^+\ell^-$ Forward-backward Asymmetry and New Physics $B\to K^*\ell^+\ell^-$ Forward-backward Asymmetry and New Physics

2007-01-08

arxiv.org/abs/hep-ph/0701046v2

Phys.Rev.D77:014016,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

RevTex 4 pages including 5 eps figures; Minor changes made, references added

Scientific paper

10.1103/PhysRevD.77.014016

The forward-backward asymmetry ${\cal A}_{\rm FB}$ in $B\to K^*\ell^+\ell^-$ decay is a sensitive probe of New Physics. Previous studies have focused on the sensitivity in the position of the zero. However, the short distance effective couplings are in principle complex, as illustrated by $B\to \rho\ell^+\ell^-$ decay within the Standard Model. Allowing the effective couplings to be complex, but keeping the $B\to K^*\gamma$ and $K^*\ell^+\ell^-$ rate constraints, we find the landscape for ${\cal A}_{\rm FB}(B\to K^*\ell^+\ell^-)$ to be far richer than from entertaining just sign flips, which can be explored by future high statistics experiments.

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