Abstract
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 language | English |
|---|---|
| Pages (from-to) | 57-71 |
| Journal | Zeitschrift für Physik C Particles and Fields |
| Volume | 64 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 1 Jan 1994 |