We give the first accurate results for B and Bs meson masses from lattice QCD including the effect of u, d and s sea quarks, and we improve an earlier value for the Bc meson mass. By using the Highly Improved Staggered Quark action for u/d, s and c quarks and NRQCD for the b quarks, we are able to achieve an accuracy in the masses of around 10 MeV. Our results are: mB = 5.291(18) GeV, mBs = 5.363(11) GeV and mBc = 6.280(10) GeV. Note that all QCD parameters here are tuned from other calculations, so these are parameter free tests of QCD against experiment. We also give scalar, Bs0∗, and axial vector, Bs1, meson masses. We find these to be slightly below threshold for decay to BK and B∗K respectively.
@article{arxiv.1010.3848,
title = {Precise B, B_s and B_c meson spectroscopy from full lattice QCD},
author = {Eric B. Gregory and Christine T. H. Davies and Iain D. Kendall and Jonna Koponen and Kit Wong and Eduardo Follana and Elvira Gamiz and G. Peter Lepage and Eike H. Muller and Heechang Na and Junko Shigemitsu},
journal= {arXiv preprint arXiv:1010.3848},
year = {2011}
}