Solving the rho - pi puzzle by higher charmonium Fock states

Details Solving the rho - pi puzzle by higher charmonium Fock states Solving the rho - pi puzzle by higher charmonium Fock states

1998-08-06

arxiv.org/abs/hep-ph/9808237v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages, Talk given at 3rd Workshop on Continuous Advances in QCD (QCD 98), Minneapolis, MN, 16-19 Apr 1998

Scientific paper

A new explanation for the longstanding puzzle of the tiny branching fraction of psi' --> rho pi relative to that for J/psi --> rho pi was proposed. In the case of J/psi, we argue that this decay is dominated by a higher Fock state in which the c cbar pair is in a color-octet ^3S_1 state and annihilates via the process c cbar --> q qbar. In the case of the psi', we argue that the probability for the c cbar c pair in this higher Fock state to be close enough to annihilate is suppressed by a dynamical effect related to the small energy gap between the mass of the psi' and the D Dbar threshold.

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