TTP - TTP01-30 Counting contact terms in $B \to V \gamma$ decays

Institute for Theoretical Particle Physics (TTP)

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.

Alexander Khodjamirian and Daniel Wyler

in a volume “From Integrable Models to Gauge Theories”, in honor of Sergei Matinyan, edited by V. G. Gurzadyan and A. G. Sedrakian, World Scientific, Singapore, 2002

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TTP01-30 Counting contact terms in $B \to V \gamma$ decays

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