Measurement of the proton form factor by studying $e^{+}{e}^{-}\to p\bar{p}$

Abstract

Using data samples collected with the BESIII detector at the BEPCII collider, we measure the Born cross section of $e^{+}{e}^{-}\to p\bar{p}$ at 12 center-of-mass energies from 2232.4 to 3671.0 MeV. The corresponding effective electromagnetic form factor of the proton is deduced under the assumption that the electric and magnetic form factors are equal $(|G_E|=|G_M|)$. In addition, the ratio of electric to magnetic form factors, $|G_E/G_M|$, and $|G_M|$ are extracted by fitting the polar angle distribution of the proton for the data samples with larger statistics, namely at $\sqrt{s}=$ 2232.4 and 2400.0 MeV and a combined sample at $\sqrt{s}$ = 3050.0, 3060.0 and 3080.0 MeV, respectively. The measured cross sections are in agreement with recent results from BaBar, improving the overall uncertainty by about 30\%. The $|G_E/G_M|$ ratios are close to unity and consistent with BaBar results in the same $q^2$ region, which indicates the data are consistent with the assumption that $|G_E|=|G_M|$ within uncertainties.

arXiv comment13 pages, 24 figures

References in corpus (16)

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• Proton elastic form factor ratios to $Q^2$ = 3.5 GeV${}^2$ by polarization transfer
• Final Analysis of Proton Form Factor Ratio Data at ${\mathbf{Q}}^2=4.0$, 4.8 and 5.6 GeV${}^2$
• Study of e+e- --> p anti-p via initial-state radiation at BABAR
• Study of e+e- --> Lambda anti-Lambda, Lambda anti-Sigma0, Sigma0 anti-Sigma0 using Initial State Radiation with BABAR
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• Re-analysis of the nucleon space- and time-like electromagnetic form factors in a two-component model
• Exclusive event generator for $e^{+}{e}^{-}$ scan experiments
• Nucleon electromagnetic form factors from lattice QCD using a nearly physical pion mass
• The electromagnetic form factors of the proton in the timelike region
• Measurement of the e+e- --> p anti-p cross section in the energy range from 3.0 to 6.5 GeV
• An Improved Parton Shower algorithm in QED
• A measurement of the CP-conserving component of the decay KS -> pi+ pi- pi0
• Measurement of the cross section for e^+e^- -> ppbar at center-of-mass energies from 2.0 to 3.07 GeV
• Electromagnetic nucleon form factors in instant and point form
• Simulation of electron-positron annihilation into hadrons with the event generator PHOKHARA

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• Study of $\psi (3770)$ decaying to Baryon anti-Baryon Pairs
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• Baryon Form Factors