Charmonium production in e+e- to \psi + X(c\bar c) and e+e- to D*D_J

TL;DR

This paper investigates charmonium production in electron-positron collisions, revealing violations of traditional factorization and predicting observable effects near production thresholds, with implications for understanding strong interactions.

Contribution

It demonstrates that single gluon exchange causes non-factorizing interactions, leading to large scalar production amplitudes and observable threshold effects in D*D_J channels.

Findings

Chi_0 dominance violates OZI factorization.

Single gluon exchange induces large scalar amplitudes.

Predicted enhancements in D*D_0 and DD_1 channels near threshold.

Abstract

The dominance of chi_0 in the data for e+e- to psi + chi_J(c\bar{c}) is shown to violate OZI factorization. Single gluon exchange gives a non-factorizing effective S.L interaction that generates a large scalar production amplitude. This also has observable effects near threshold in e+e- to D*D_J, where enhancements of D*D_0 and DD_1 channels are predicted. Further tests and implications are discussed.