On the strong energy dependence of the e+ e- kleiner grösser p anti-p amplitude near threshold

Haidenbauer, J.; Sibirtsev, A.; Meissner, U.G.; Hammer, H. W.

doi:10.1016/j.physletb.2006.10.016

Journal Article

PreJuSER-54714

On the strong energy dependence of the e+ e- kleiner grösser p anti-p amplitude near threshold

Haidenbauer, J.FZJ* ; Hammer, H. W. ; Sibirtsev, A.FZJ* ; Meissner, U. G.FZJ*

2006
North-Holland Publ. Amsterdam

Physics letters / B 643, 29 - 32 (2006) [10.1016/j.physletb.2006.10.016]

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Please use a persistent id in citations: http://hdl.handle.net/2128/10573 doi:10.1016/j.physletb.2006.10.016

Abstract: We study the energy dependence of the e(+)e(-) -> p (k) over bar cross section close to the two-nucleon threshold, recently reported by the BaBar Collaboration. Our analysis also includes the (p) over barp -> e(+)e(-) data collected by PS170 Collaboration and the e(+)e(-) -> N (K) over bar data from the FENICE Collaboration. We show that the near-threshold enhancement in the e(+)e(-) ->. pp cross section can be explained by the final-state interaction between proton and antiproton in the S-3(1) partial wave, utilizing the Julich 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 then likewise driven by this final-state interaction effect. This result is in line with our previous studies of the near-threshold enhancement of the pp invariant mass spectrum seen in the J/psi -> gamma p (p) over bar decay by the BES Collaboration and in the B+ -> p (p) over barK(+) decay by the BaBar Collaboration. (c) 2006 Elsevier B.V. All rights reserved.

Keyword(s): electron positron: annihilation ; p: pair production ; channel cross section: energy dependence ; anti-p p: annihilation ; electron: pair production ; final-state interaction ; partial wave ; p: form factor ; momentum transfer dependence ; nucleon: threshold ; J/psi(3100): radiative decay ; B+: hadronic decay ; anti-p p: mass spectrum ; numerical calculations: interpretation of experiments