Light-cone expansion of heavy-to-light form factors

Details Light-cone expansion of heavy-to-light form factors Light-cone expansion of heavy-to-light form factors

2008-08-27

arxiv.org/abs/0808.3791v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

3 pages, Talk given at XIII International Conference "Selected Problems of Modern Theoretical Physics", Dubna, Russia, June 23

Scientific paper

We present the results of our recent systematic study of the light-cone expansion of heavy-to-light transition form factors in a model with scalar constituents [1]. We show that the higher-twist contributions (represented in this model by off-light-cone effects) all have the same behaviour in the 1/m_Q expansion. The suppression parameter of the higher-twist contributions compared to the lower-twist contributions is, in general, the inverse Borel parameter \beta. The only exception here is the case of the leading and the subleading twists: they are of the same order in 1/\beta because of an extra suppression of the leading-twist contribution to the form factor.

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