Counting contact terms in $B\to V\gamma$ decays
High Energy Physics - Phenomenology
2016-11-23 v1
Abstract
We clarify the origin and cancellation of contact terms in the weak annihilation amplitudes contributing to . It is demonstrated that the photon emission from the final-state quarks vanishes in the chiral limit of massless quarks. The contact terms in the QCD light-cone sum rule evaluation of the weak annihilation amplitudes are also discussed.
Cite
@article{arxiv.hep-ph/0111249,
title = {Counting contact terms in $B\to V\gamma$ decays},
author = {Alexander Khodjamirian and Daniel Wyler},
journal= {arXiv preprint arXiv:hep-ph/0111249},
year = {2016}
}
Comments
16 pages, 2 figures, Latex, ws-p8-50x6-00.cls, to be published in Sergei Matinian Festschrift ``From Integrable Models to Gauge Theories.'', Eds. V. Gurzadyan, A. Sedrakyan, World Scientific, 2002