Sj. Brodsky et M. Karliner, INTRINSIC CHARM OF VECTOR-MESONS - A POSSIBLE SOLUTION OF THE RHO-PI PUZZLE, Physical review letters, 78(25), 1997, pp. 4682-4685
An outstanding mystery of charmonium physics is why the J/psi decays p
rominently to pseudoscalar plus vector meson channels, such as J/psi -
-> rho pi and J/psi --> KK, whereas the psi'(2S) does not. We show th
at such decays of J/psi and their suppression for psi'(2S) follow natu
rally from the existence of intrinsic charm \(q) over bar q (c) over b
ar c] Fock components of the light vector mesons.