Decay constants of D and B mesons are estimated within the framework of a heavy-quark approach using measured isospin mass splittings in the D, D∗, and B states to isolate the electromagnetic hyperfine interaction between quarks. The values fD=(262±29) MeV and fB=(160±17) MeV are obtained. Only experimental errors are given; possible theoretical ambiguities, and suggestions for reducing them, are noted.
@article{arxiv.hep-ph/9207235,
title = {Meson Decay Constants from Isospin Mass Splittings in the Quark Model},
author = {J. F. Amundson and J. L. Rosner and M. A. Kelly and N. Horowitz and S. L. Stone},
journal= {arXiv preprint arXiv:hep-ph/9207235},
year = {2009}
}