Home > Publications database > Near-threshold p ¯ p invariant mass spectrum measured in J / ψ and ψ ′ decays |
Journal Article | FZJ-2015-06728 |
; ;
2015
Soc.
[S.l.]
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Please use a persistent id in citations: http://hdl.handle.net/2128/11123 doi:10.1103/PhysRevD.91.074003
Abstract: A systematic analysis of the near-threshold enhancement in the p¯p invariant mass spectrum seen in the decay reactions J/ψ→xp¯p and ψ(3686)→xp¯p (x=γ,ω,ρ,π,η) is presented. The enhancement is assumed to be due to the N¯N final-state interaction (FSI) and the pertinent FSI effects are evaluated in an approach that is based on the distorted-wave Born approximation. For the N¯N interaction a recent potential derived within chiral effective field theory and fitted to results of a partial-wave analysis of p¯p scattering data is considered and, in addition, an older phenomenological model constructed by the Jülich group. It is shown that the near-threshold spectrum observed in various decay reactions can be reproduced simultaneously and consistently by our treatment of the p¯p FSI. It turns out that the interaction in the isospin-1 S10 channel required for the description of the J/ψ→γp¯p decay predicts a N¯N bound state.
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