The model-independent parametrization for exclusive hadronic form factors commonly used for semileptonic decays is generalized to allow for the inclusion of above-threshold resonant poles of known mass and width. We discuss the interpretation of such poles, particularly with respect to the analytic structure of the relevant two-point Green's function in which they reside. Their presence has a remarkably small effect on the parametrization, as we show explicitly for the case of D→πe+νe.
@article{arxiv.1509.04847,
title = {Above-Threshold Poles in Model-Independent Form Factor Parametrizations},
author = {Benjamin Grinstein and Richard F. Lebed},
journal= {arXiv preprint arXiv:1509.04847},
year = {2015}
}
Comments
8 pages, no figures, REVTeX. Version accepted by Phys. Rev. D. References and clarifying remarks added