We present a study of the B spectrum performed in the framework of Heavy Quark Effective Theory expanded to next-to-leading order in 1/m and non-perturbative in the strong coupling. Our analyses have been performed on Nf=2 lattice gauge field ensembles corresponding to three different lattice spacings and a wide range of pion masses. We obtain the Bs-meson mass and hyperfine splittings of the B- and Bs-mesons that are in good agreement with the experimental values and examine the mass difference m_{Bs}-m_B as a further cross-check of our previous estimate of the b-quark mass. We also report on the mass splitting between the first excited state and the ground state in the B and Bs systems.
@article{arxiv.1505.03360,
title = {B-meson spectroscopy in HQET at order 1/m},
author = {Fabio Bernardoni and Benoît Blossier and John Bulava and Michele Della Morte and Patrick Fritzsch and Nicolas Garron and Antoine Gérardin and Jochen Heitger and Georg von Hippel and Hubert Simma},
journal= {arXiv preprint arXiv:1505.03360},
year = {2015}
}
Comments
35 pages, 14 tables, 17 figures; Introduction extended and typos corrected. Version accepted for publication in PRD