Abstract
A model for decays like ψ(ns)→ J ψ +π+π and ▪(ns)→ ▪+π+π by sequential pion emission via a heavy intermediate state like D D or B B predicts a qualitatively different pion spectrum and may explain the observed disagreement between experiment and previous predictions for ▪(3 s → ▪+π+π. Simple distributions predicted for the angle between the momenta of the two pions in the laboratory, rather than for invariant mass, include a forward-backward symmetry not easily explained by the other models where it implies a peculiar accidental symmetry between low-mass and high-mass gluonic states. Preliminary data for the ▪(3s) decay show both high-mass and low-mass peaks as suggested by the model.
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