Strong three-meson couplings of $J/\ddot{I}ˆ$ and $\hat{I}{\cdot }_c$

Abstract

We discuss the strong couplings $g_{PPV}$ and $g_{VVP}$ for vector ($V$) and pseudoscalar ($P$) mesons, at least one of which is a charmonium state $J/\ddot{I}ˆ$ or $\hat{I}{\cdot }_c$. 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.

8 pages, typo in Eq (2.1) corrected, minor stylistic changes, version to appear in Physical Review D