期刊
PHYSICAL REVIEW D
卷 62, 期 9, 页码 -出版社
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevD.62.094019
关键词
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We evaluate in perturbative QCD, up to order alpha (4)(s) the mass of the B-c. We use the so-called 1S mass in order to improve the convergence of the perturbative series. Our result is E(B-c)(pert) = 6326(-9)(+29) MeV. Nonperturbative effects are discussed. A comparison with potential models seems to be consistent with nonperturbative contributions of the order - (40-100) MeV.
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