QCD estimate of the long-distance effect in B → K ∗ γ

@inproceedings{Khodjamirian1997QCDEO,
title={QCD estimate of the long-distance effect in B → K ∗ γ},
author={A. Khodjamirian and R. R{\"u}ckl and Gautier Stoll and Daniel Wyler},
year={1997}
}

We suggest to use operator product expansion and QCD sum rule techniques to estimate the long-distance contribution to the amplitude of the exclusive rare decay B → K∗γ. In contrast to a phenomenological description in terms of ψ resonances converting into a photon, the virtual charm quark loop interacting with soft gluons is represented by a new quark-gluon-photon operator. The matrix element of this operator is calculated in the same approximation as the matrix element of the leading magnetic… CONTINUE READING

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