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

This title appears in the Scientific Report : 2006

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

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...

Personal Name(s):	Haidenbauer, J.
	Hammer, H. W. / Sibirtsev, A. / Meissner, U.G.
Contributing Institute:	Institut 3 (Theoretische Kernphysik); IKP-TH Jülich-Aachen Research Alliance - Simulation Sciences; JARA-SIM
Published in:	Physics letters / B, 643 (2006) S. 29 - 32
Imprint:	Amsterdam North-Holland Publ. 2006
Physical Description:	29 - 32
DOI:	10.1016/j.physletb.2006.10.016
Document Type:	Journal Article
Research Program:	Physik der Hadronen und Kerne
Series Title:	Physics Letters B 643
Subject (ZB):	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
Link:	Get full text OpenAccess OpenAccess
	Publikationsportal JuSER

Please use the identifier: http://hdl.handle.net/2128/10573 in citations.
Please use the identifier: http://dx.doi.org/10.1016/j.physletb.2006.10.016 in citations.

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.