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Evidence for a J/psi-ppbar Pauli Strong Coupling ? · Around

2007

Evidence for a J/psi-ppbar Pauli Strong Coupling ?

Barnes, T., Li, X., Roberts, W.

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The couplings of charmonia and charmonium hybrids (generically Psi) to ppbar are of great interest in view of future plans to study these states using an antiproton storage ring at GSI.

These low to moderate energy Psi-ppbar couplings are not well understood theoretically, and currently must be determined from experiment.
In this letter we note that the two independent Dirac (gamma_mu) and Pauli (sigma_munu) ppbar couplings of the J/psi and psi' can be constrained by the angular distribution of e+e- -> (J/psi, psi') -> ppbar on resonance.
A comparison of our theoretical results to recent unpolarized data allows estimates of the ppbar couplings; in the better determined J/psi case the data is inconsistent with a pure Dirac (gamma_mu) coupling, and can be explained by the presence of a sigma_munu term.

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