Ugva-dpt 1995/05-890 Bari-th/95-200 Strong Coupling of Excited Heavy Mesons
نویسندگان
چکیده
We compute the strong coupling constant G B B (G D D), where B (D) is the 0 + P?wave b q (c q) state, by QCD sum rules and by light-cone sum rules. The two methods give compatible results in the limit m Q ! 1, with a rather large value of the coupling constant. We apply the results to the calculation of the hadronic widths of the positive parity B and D states and to the chiral loop contribution to the ratio f Ds =f D .
منابع مشابه
Chiral Effective Theory for Heavy Mesons
I review recent developments in the description of the interactions between light and heavy mesons by an effective chiral lagrangian having the symmetries of the Heavy Quark Effective Theory. In particular the problem of the determination of the strong coupling constants gP Pπ and gP Pρ (P, P ∗ = heavy mesons) is addressed. BARI-TH/94-188 November 1994 Invited talk given at the 18th J. Hopkins ...
متن کاملA Quark model for Heavy Mesons: Strong Decays
I shortly review the application of a recently introduced constituent quark-meson model to the determination of some strong coupling constants governing the decays of charm heavy mesons with one pion in the final state. I present the model directly through its rules for computing amplitudes. For a detailed explanation of the model, the reader is referred to the original papers. PACS: 13.20.He, ...
متن کاملCLNS 95/1377 MZ-TH/95-31 Sum Rules for Radiative and Strong Decays of Heavy Mesons
We derive two model-independent sum rules relating the transition matrix elements for radiative and strong decays of excited heavy mesons to properties of the lowest-lying heavy mesons. The sum rule for the radiative decays is an analog of the Cabibbo-Radicati sum rule and expresses the sum of the radiative widths in terms of the isovector charge radius of the ground state heavy meson. Using mo...
متن کاملInfrared Regularization of Yang{Mills Theories
We introduce an infrared regulator in Yang{Mills theories under the form of a mass term for the nonabelian elds. We show that the resulting action, built in a covariant linear gauge, is multiplicatively renormalizable by proving the validity at all orders of the Slavnov identity de ning the theory. hep-th/9511068 UGVA-DPT-95-11-908 November 1995 Supported in part by the Swiss National Science F...
متن کاملStrong coupling of excited heavy mesons.
We compute the strong coupling constant GB∗∗Bπ (GD∗∗Dπ), where B ∗∗ (D∗∗) is the 0+ P−wave bq̄ (cq̄) state, by QCD sum rules and by light-cone sum rules. The two methods give compatible results in the limit mQ → ∞, with a rather large value of the coupling constant. We apply the results to the calculation of the hadronic widths of the positive parity B and D states and to the chiral loop contribu...
متن کامل