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Study of e+e- --> p anti-p via initial-state radiation at BABAR

Abstract : The process e+e- --> p anti-p gamma is studied using 469 fb-1 of integrated luminosity collected with the BABAR detector at the PEP-II collider, at an e+e- center-of-mass energy of 10.6 GeV. From the analysis of the p anti-p invariant mass spectrum, the energy dependence of the cross section for e+e- --> p anti-p is measured from threshold to 4.5 GeV. The energy dependence of the ratio of electric and magnetic form factors, |G_E/G_M|, and the asymmetry in the proton angular distribution are measured for p anti-p masses below 3 GeV. We also measure the branching fractions for the decays J/psi --> p anti-p and psi(2S) --> p anti p.
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http://hal.in2p3.fr/in2p3-00786076
Contributor : Claudine Bombar <>
Submitted on : Thursday, February 7, 2013 - 4:34:53 PM
Last modification on : Wednesday, September 16, 2020 - 4:25:54 PM

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J.P. Lees, V. Poireau, V. Tisserand, D. Bernard, M. Verderi, et al.. Study of e+e- --> p anti-p via initial-state radiation at BABAR. Physical Review D, American Physical Society, 2013, 87, pp.092005. ⟨10.1103/PhysRevD.87.092005⟩. ⟨in2p3-00786076⟩

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