Counting contact terms in $B\to Vγ$ decays

Details Counting contact terms in $B\to Vγ$ decays Counting contact terms in $B\to Vγ$ decays

2001-11-20

arxiv.org/abs/hep-ph/0111249v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

16 pages, 2 figures, Latex, ws-p8-50x6-00.cls, to be published in Sergei Matinian Festschrift ``From Integrable Models to Gaug

Scientific paper

We clarify the origin and cancellation of contact terms in the weak
annihilation amplitudes contributing to $B\to V \gamma$. 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.

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