Strong D* -> D+pi and B* -> B+pi couplings
Nuclear Theory
2011-02-23 v1 High Energy Physics - Experiment
High Energy Physics - Lattice
High Energy Physics - Phenomenology
Abstract
We compute g_{D* D pi} and g_{B* B pi} using a framework in which all elements are constrained by Dyson-Schwinger equation studies of QCD, and therefore incorporates a consistent, direct and simultaneous description of light- and heavy-quarks and the states they may constitute. We link these couplings with the heavy-light-meson leptonic decay constants, and thereby obtain g_{D* D pi}=15.9+2.1/-1.0 and g_{B* B pi}=30.0+3.2/-1.4. From the latter we infer \hat-g_B=0.37+0.04/-0.02. A comparison between g_{D* D pi} and g_{B* B pi} indicates that when the c-quark is a system's heaviest constituent, Lambda_{QCD}/m_c-corrections are not under good control.
Cite
@article{arxiv.1012.5034,
title = {Strong D* -> D+pi and B* -> B+pi couplings},
author = {Bruno El-Bennich and Mikhail A. Ivanov and Craig D. Roberts},
journal= {arXiv preprint arXiv:1012.5034},
year = {2011}
}
Comments
5 pages, 1 table, 2 figures