Nonperturbative charming penguin contributions to isospin asymmetries in radiative B decays
Abstract
Recent experimental data on the radiative decays B→Vγ, where V is a light vector meson, find small isospin violation in B→K*γ while isospin asymmetries in B→ργ are of order 20%, with large uncertainties. Using soft-collinear effective theory, we calculate isospin asymmetries in these radiative B decays up to O(1/mb), also including O(vαs) contributions from nonperturbative charming penguins (NPCP). In the absence of NPCP contributions, the theoretical predictions for the asymmetries are a few percent or less. Including the NPCP can significantly increase the isospin asymmetries for both B→Vγ modes. We also consider the effect of the NPCP on the branching ratio and CP asymmetries in B±→V±γ.
- Publication:
-
Physical Review D
- Pub Date:
- September 2008
- DOI:
- 10.1103/PhysRevD.78.054024
- arXiv:
- arXiv:0805.1735
- Bibcode:
- 2008PhRvD..78e4024K
- Keywords:
-
- 13.25.Hw;
- 13.40.Hq;
- Decays of bottom mesons;
- Electromagnetic decays;
- High Energy Physics - Phenomenology
- E-Print:
- 14 pages, 4 figures. Updated analysis of charming penguin extraction