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First measurement of proton's charge form factor at very low Q2 with initial state radiation

  • M. Mihovilovič
  • , A. B. Weber
  • , P. Achenbach
  • , T. Beranek
  • , J. Beričič
  • , J. C. Bernauer
  • , R. Böhm
  • , D. Bosnar
  • , M. Cardinali
  • , L. Correa
  • , L. Debenjak
  • , A. Denig
  • , M. O. Distler
  • , A. Esser
  • , M. I. Ferretti Bondy
  • , H. Fonvieille
  • , J. M. Friedrich
  • , I. Friščić
  • , K. Griffioen
  • , M. Hoek
  • S. Kegel, Y. Kohl, H. Merkel, D. G. Middleton, U. Müller, L. Nungesser, J. Pochodzalla, M. Rohrbeck, S. Sánchez Majos, B. S. Schlimme, M. Schoth, F. Schulz, C. Sfienti, S. Širca, S. Štajner, M. Thiel, A. Tyukin, M. Vanderhaeghen, M. Weinriefer

Research output: Contribution to journalArticlepeer-review

41 Scopus citations

Abstract

We report on a new experimental method based on initial-state radiation (ISR) in e–p scattering, which exploits the radiative tail of the elastic peak to study the properties of electromagnetic processes and to extract the proton charge form factor (GE p) at extremely small Q2. The ISR technique was implemented in an experiment at the three-spectrometer facility of the Mainz Microtron (MAMI). This led to a precise validation of radiative corrections far away from elastic line and provided first measurements of GE p for 0.001≤Q2≤0.004(GeV/c)2.

Original languageEnglish
Pages (from-to)194-198
Number of pages5
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume771
DOIs
StatePublished - Aug 10 2017

Keywords

  • Form factor
  • Initial state radiation
  • Proton
  • Radiative corrections

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