Measurement of the $e^+e^- \to p\bar{p}$ cross section in the energy range from 3.0 to 6.5 GeV

The e+e-→pp¯ cross section and the proton magnetic form factor have been measured in the center-of-mass energy range from 3.0 to 6.5 GeV using the initial-state radiation technique with an undetected photon. This is the first measurement of the form factor at energies higher than 4.5 GeV. The analysis is based on 469 fb-1 of integrated luminosity collected with the BABAR detector at the PEP-II collider at e+e- center-of-mass energies near 10.6 GeV. The branching fractions for the decays J/ψ→pp¯ and ψ(2S)→pp¯ have also been measured.

Note:

14 pages, 12 figures, submitted to Phys. Rev. D

13.66.Bc
14.20.Dh
13.40.Gp
13.25.Gv
p: form factor: magnetic
J/psi(3100): hadronic decay
radiation: initial-state interaction
p: pair production
electron positron: annihilation
psi mesons: branching ratio: measured

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Measurement of the e+e−→ppˉe^+e^- \to p\bar{p}e+e−→ppˉ​ cross section in the energy range from 3.0 to 6.5 GeV

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Measurement of the $e^+e^- \to p\bar{p}$ cross section in the energy range from 3.0 to 6.5 GeV