# A study of $e^+e^- \to p \bar{p}$ using initial state radiation with BABAR

Abstract : The e+e- -> p anti-p cross section is determined over a range of p anti-p masses, from threshold to 4.5 GeV/c^2, by studying the e+e- -> p anti-p gamma process. The data set corresponds to an integrated luminosity of 232 fb^-1, collected with the BABAR detector at the PEP-II storage ring, at an e+e- center-of-mass energy of 10.6 GeV. The mass dependence of the ratio of electric and magnetic form factors, |G_E/G_M|, is measured for p anti-p masses below 3 GeV/c^2; its value is found to be significantly larger than 1 for masses up to 2.2 GeV/c^2. We also measure J/psi -> p anti-p and psi(2S) -> p anti-p branching fractions and set an upper limit on Y(4260) -> p anti-p production and decay.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00025514
Contributor : Dominique Girod <>
Submitted on : Friday, January 27, 2006 - 11:40:20 AM
Last modification on : Wednesday, September 16, 2020 - 4:23:36 PM

### Citation

B. Aubert, R. Barate, D. Boutigny, F. Couderc, Y. Karyotakis, et al.. A study of $e^+e^- \to p \bar{p}$ using initial state radiation with BABAR. Physical Review D, American Physical Society, 2006, 73, pp.012005. ⟨10.1103/PhysRevD.73.012005⟩. ⟨in2p3-00025514⟩

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