On the strong energy dependence of the e^+e^- to ppbar amplitude near threshold

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dc.creatorHaidenbauer, J.
dc.creatorHammer, H. -W.
dc.creatorMeißner, Ulf-G.
dc.creatorSibirtsev, A.
dc.date2006-06-06
dc.date2006-06-14
dc.date.accessioned2026-07-07T10:24:58Z
dc.date.available2026-07-07T10:24:58Z
dc.descriptionWe study the energy dependence of the e^+e^- to ppbar cross section close to the two-nucleon threshold, recently reported by the BaBar collaboration. Our analysis also includes the pbarp to e^+e^- data collected by PS170 collaboration and the e^+e^- to NNbar data from the FENICE collaboration. We show that the near-threshold enhancement in the e^+e^- to ppbar cross section can be explained by the final-state interaction between proton and antiproton in the 3S1 partial wave, utilizing the Juelich nucleon-antinucleon model. As a consequence, the strong dependence of the proton electromagnetic form factors on the momentum transfer close to the two-nucleon threshold is presumably also driven by this final-state interaction effect. This result is in line with our previous studies of the near-threshold enhancement of the ppbar invariant mass spectrum seen in the J/Psi to gamma ppbar decay by the BES collaboration and in the B+ to ppbar K+ decay by the BaBar collaboration.
dc.description7 pages, 2 figures, Fig. 2 modified, conclusions unchanged
dc.identifierhttps://arxiv.org/abs/hep-ph/0606064
dc.identifierhttp://arxiv.org/abs/hep-ph/0606064
dc.identifierPhys.Lett.B643:29-32,2006
dc.identifierdoi:10.1016/j.physletb.2006.10.016
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/176384
dc.subjectHigh Energy Physics - Phenomenology
dc.titleOn the strong energy dependence of the e^+e^- to ppbar amplitude near threshold
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