- Publication venue
- 'Springer Science and Business Media LLC'
- Publication date
- 01/01/1994
- Field of study
Full text linkBy combining potential models and QCD spectral sum rules (QSSR), we discuss
the spectroscopy of the (bcˉ) 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: MBc​​=(6255±20)~MeV,
MBc∗​​=(6330±20)~MeV, MΛ(bcu)​=(6.93±0.05)~GeV,
MΩ(bcs)​=(7.00±0.05)~GeV, MΞ∗(ccu)​=(3.63±0.05)~GeV
and MΞ∗(bbu)​=(10.21±0.05)~GeV. The decay constant fBc​​=(2.94±0.21)fπ​ is well determined from QSSR and leads to: Γ(Bc​→ντ​τ)=(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 sec−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 ⟨αs​G2⟩ and ⟨G3⟩ gluon condensates already contain the full
heavy quark- (⟨Qˉ​Q⟩) and mixed- (⟨Qˉ​GQ⟩)
condensate contributions in the OPE.}Comment: 32 pages, LaTeX, no changes in the 1994 paper, latex errors corrected
in 201 - Publication venue
- 'The Royal Society'
- Publication date
- Field of study
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