Hadrons with charm and beauty

E. Bagan, H. G. Dosch, P. Gosdzinsky, S. Narison, J. M. Richard

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By combining potential models and QCD spectral sum rules (QSSR), we discuss the spectroscopy of the {Mathematical expression} mesons and of the (bcq), (ccq) and (bbq) baryons (q≡d or s), the decay constant and the (semi)leptonic decay modes of the Bc meson. For the masses, the best predictions come from potential models and read: {Mathematical expression} MeV, {Mathematical expression} MeV, MΛ(bcu)=(6.93±0.05) GeV, MΩ(bcs)=(7.00±0.05) GeV, MΣ*(ccu)=(3.63±0.05) GeV and MΣ*(bbu)=(10.21±0.05) GeV. The decay constant {Mathematical expression} is well determined from QSSR and leads to:Γ(Bc→vττ=(3.0±0.4)(Vcb/0.037)2×1010 s-1. The uses of the vertex sum rules for the semileptonic decays of the Bc show that the t-dependence of the form factors is much stronger than predicted by vector meson dominance. It also predicts the almost equal strength of about 0.30×1010 s-1 for the semileptonic rates Bc into Bs, Bs*, ηc and J/ψ. Besides these phenomenological results, we also show explicitly how the Wilson coefficients of the 〈αsG2〉 and 〈G3〉 gluon condensates already contain the full heavy quark {Mathematical expression} and mixed- {Mathematical expression} condensate contributions in the OPE. © 1994 Springer-Verlag.
Original languageEnglish
Pages (from-to)57-71
JournalZeitschrift fur Physik C-Particles and Fields
Issue number1
Publication statusPublished - 1 Jan 1994


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