B→K*?+?- forward-backward asymmetry and new physics
Journal
Physical Review D - Particles, Fields, Gravitation and Cosmology
Journal Volume
77
Journal Issue
1
Date Issued
2008
Author(s)
Abstract
The forward-backward asymmetry AFB in B→K*ℓ+ℓ- decay is a sensitive probe of new physics. Previous studies have focused on the sensitivity in the position of the zero. However, the effective Wilson coefficients (short distance effective couplings) are in principle complex, as illustrated by B→ρℓ+ℓ- decay within the standard model. Allowing for this, but keeping the B→K*γ and K*ℓ+ℓ- rate constraints, we find the landscape for AFB(B→K*ℓ+ℓ-) to be far richer than from entertaining just sign flips. The complex nature of effective Wilson coefficients can be explored by future high statistics experiments. © 2008 The American Physical Society.
Type
journal article