Open charm effects in the explanation of the long-standing "$ρπ$ puzzle"

Details Open charm effects in the explanation of the long-standing "$ρπ$ puzzle" Open charm effects in the explanation of the long-standing "$ρπ$ puzzle"

2012-01-09

arxiv.org/abs/1201.1681v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

Revtex, 14 pages and 4 eps figures; Revised version accepted by Phys. Rev. D

Scientific paper

A detailed analysis of the open charm effects on the decays of $J/\psi(\psi^\prime)\to VP$ is presented, where $V$ stands for light vector meson and $P$ for light pseudoscalar meson. These are the channels that the so-called "12% rule" of perturbative QCD (pQCD) is obviously violated. Nevertheless, they are also the channels that violate the pQCD helicity selection rule (HSR) at leading order. In this work, we put constraints on the electromagnetic (EM) contribution, short-distance contribution from the $c\bar{c}$ annihilation at the wavefunction origin, and long-distance contribution from the open charm threshold effects on these two decays. We show that interferences among these amplitudes, in particular, the destructive interferences between the short-distance and long-distance strong amplitudes play a key role to evade the HSR and cause the significant deviations from the pQCD expected "12% rule".

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