Heavy-to-light chromomagentic matrix element
Abstract
We report the computation of the matrix element of the chromomagnetic operator of the flavour changing neutral current (FCNC)-type between a - or -meson state and a light hadron and off-shell photon. The computation is carried out by using the method of light-cone sum rules (LCSR). It is found that the matrix element exhibits a large strong phase for which we give a long distance interpretation. The analytic structure of the correlation function in use admits a complex anomalous threshold on the physical sheet, the meaning and handling of which within the sum rule approach is discussed. We compare our results to QCD factorisation for which spectator photon emission is end-point divergent.
Keywords
Cite
@article{arxiv.1305.5332,
title = {Heavy-to-light chromomagentic matrix element},
author = {Maria Dimou and James Lyon and Roman Zwicky},
journal= {arXiv preprint arXiv:1305.5332},
year = {2013}
}
Comments
6p, 6 figures, 1 table -- proceedings of 4th Capri Workshop on Flavour Physics