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

Hovhannisyan, Artyom; Hou, Wei-Shu; Mahajan, Namit

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

Authors

Hovhannisyan, Artyom

Hou, Wei-Shu

Mahajan, Namit

Description

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 $B\to ρ\ell^+\ell^-$ decay within the Standard Model. Allowing the effective couplings to be complex, but keeping the $B\to K^*γ$ 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.
RevTex 4 pages including 5 eps figures; Minor changes made, references added