The B c mass up to order α 4 s Nora Brambilla and Antonio Vairo
نویسنده
چکیده
We evaluate in perturbative QCD, up to order αs , 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 = 6323 +3 +7 −1−6 MeV. Non-perturbative effects are discussed. An estimate in terms of local condensates and a comparison with potential models seem to be consistent with non-perturbative contributions of the order −(40 ÷ 80)MeV.
منابع مشابه
The Heavy Quarkonium Spectrum at Order mα 5 s ln α s
We compute the complete leading-log terms of the next-to-next-to-next-to-leadingorder corrections to potential NRQCD. As a by-product we obtain the leading logs at O(mαs ) in the heavy quarkonium spectrum. These leading logs, when ΛQCD ≪ mα 2 s , give the complete O(mα 5 s lnαs) corrections to the heavy quarkonium spectrum. Preprint submitted to Elsevier Preprint 1 February 2008
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Nora Brambilla, Dolors Eiras, Antonio Pineda, Joan Soto, and Antonio Vairo INFN and Dipartimento di Fisica dell’Università di Milano, via Celoria 16, 20133 Milan, Italy Dept. d’Estructura i Constituents de la Matèria and IFAE, Universidad Barcelona Diagonal 647, E-08028 Barcelona, Catalonia, Spain Theory Division, CERN, 1211 Geneva 23, Switzerland ~Received 5 August 2002; published 27 February ...
متن کاملQuarkonium: an effective field theory approach
We discuss heavy quarkonium in the framework of pNRQCD, a QCD effective theory appropriate for the study of heavy quark bound systems.
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تاریخ انتشار 2000