Study of electromagnetic decay of $J/ψ$ and $ψ^\prime$ to vector and pseudoscalar

Details Study of electromagnetic decay of $J/ψ$ and $ψ^\prime$ to vector and pseudoscalar Study of electromagnetic decay of $J/ψ$ and $ψ^\prime$ to vector and pseudoscalar

2006-10-18

arxiv.org/abs/hep-ph/0610223v3

Phys.Lett.B645:173-179,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

Revtex, 10 pages, 1 eps figure; further discussions about the helicity conservation rule and exp. constraints are included; ve

Scientific paper

10.1016/j.physletb.2006.12.037

The electromagnetic decay contributions to $J/\psi(\psi^\prime)\to VP$, where $V$ and $P$ stand for vector and pseudoscalar meson, respectively, are investigated in a vector meson dominance (VMD) model. We show that $J/\psi (\psi^\prime)\to \gamma^*\to VP$ can be constrained well with the available experimental information. We find that this process has significant contributions in $\psi^\prime\to VP$ and may play a key role in understanding the deviations from the so-called "12% rule" for the branching ratio fractions between $\psi^\prime\to VP$ and $J/\psi\to VP$. We also address that the "12% rule" becomes very empirical in exclusive hadronic decay channels.

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