Measurement of proton electromagnetic form factors in the time-like region using initial state radiation at BESIII

BESIII Collaboration

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48 Scopus citations

Abstract

The electromagnetic process e+e→pp¯ is studied with the initial-state-radiation technique using 7.5 fb−1 of data collected by the BESIII experiment at seven energy points from 3.773 to 4.600 GeV. The Born cross section and the effective form factor of the proton are measured from the production threshold to 3.0 GeV/c2 using the pp¯ invariant-mass spectrum. The ratio of electric and magnetic form factors of the proton is determined from the analysis of the proton-helicity angular distribution.

Original languageEnglish (US)
Article number136328
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume817
DOIs
StatePublished - Jun 10 2021
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2021 The Author

Keywords

  • BESIII
  • Electromagnetic form factors
  • Initial state radiation
  • Proton

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