Strong three-meson couplings of J/ψ and ηc

Abstract : We discuss the strong couplings gPPV and gVVP for vector (V) and pseudoscalar (P) mesons, at least one of which is a charmonium state J/ψ or ηc. The strong couplings are obtained as residues at the poles of suitable form factors, calculated in a broad range of momentum transfers using a dispersion formulation of the relativistic constituent quark model. The form factors obtained in this approach satisfy all constraints known for these quantities in the heavy-quark limit. Our results suggest sizably higher values for the strong meson couplings than those reported in the literature from QCD sum rules.
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Submitted on : Wednesday, April 13, 2016 - 11:42:03 AM
Last modification on : Thursday, January 11, 2018 - 6:12:41 AM

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W. Lucha, D. Melikhov, H. Sazdjian, S. Simula. Strong three-meson couplings of J/ψ and ηc. Physical Review D, American Physical Society, 2016, 93, pp.016004 ⟨10.1103/PhysRevD.93.016004⟩. ⟨in2p3-01301901⟩

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