We evaluate in perturbative QCD, up to order αs4, the mass of the Bc. We use the so-called 1S-mass in order to improve the convergence of the perturbative series. Our result is E(Bc)pert=6326−9+29 MeV. Non-perturbative effects are discussed. A comparison with potential models seems to be consistent with non-perturbative contributions of the order −(40÷100) MeV.
@article{arxiv.hep-ph/0002075,
title = {The $B_c$ mass up to order $\alpha_s^4$},
author = {Nora Brambilla and Antonio Vairo},
journal= {arXiv preprint arXiv:hep-ph/0002075},
year = {2008}
}
Comments
14 pages, revtex, 2 figures, minor changes, discussion on the non-perturbative corrections added, final version to appear in Phys. Rev. D