Journal Article FZJ-2015-06728

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Near-threshold p ¯ p invariant mass spectrum measured in J / ψ and ψ ′ decays

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2015
Soc. [S.l.]

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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.

Classification:

Contributing Institute(s):
  1. Theorie der Starken Wechselwirkung (IAS-4)
  2. Institut 3 (Theoretische Kernphysik) (IKP-3)
Research Program(s):
  1. 511 - Computational Science and Mathematical Methods (POF3-511) (POF3-511)
  2. 531 - Condensed Matter and Molecular Building Blocks (POF3-531) (POF3-531)

Appears in the scientific report 2015
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Medline ; American Physical Society Transfer of Copyright Agreement ; OpenAccess ; Current Contents - Physical, Chemical and Earth Sciences ; IF < 5 ; JCR ; NationallizenzNationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection
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 Record created 2015-11-23, last modified 2021-01-29