Technical supplement to “Polarization transfer observables in elastic electron-proton scattering at Q 2 =2.5,5.2,6.8 and 8.5GeV 2

A. J.R. Puckett, E. J. Brash, M. K. Jones, W. Luo, M. Meziane, L. Pentchev, C. F. Perdrisat, V. Punjabi, F. R. Wesselmann, A. Afanasev, A. Ahmidouch, I. Albayrak, K. A. Aniol, J. Arrington, A. Asaturyan, H. Baghdasaryan, F. Benmokhtar, W. Bertozzi, L. Bimbot, P. BostedW. Boeglin, C. Butuceanu, P. Carter, S. Chernenko, M. E. Christy, J. C. Cornejo, S. Covrig, S. Danagoulian, A. Daniel, A. Davidenko, D. Day, S. Dhamija, D. Dutta, R. Ent, S. Frullani, H. Fenker, E. Frlez, F. Garibaldi, D. Gaskell, S. Gilad, R. Gilman, Y. Goncharenko, K. Hafidi, D. Hamilton, D. W. Higinbotham, W. Hinton, T. Horn, B. Hu, J. Huang, G. M. Huber

Research output: Contribution to journalArticlepeer-review


The GEp-III and GEp-2γ experiments, carried out in Jefferson Lab's Hall C from 2007–2008, consisted of measurements of polarization transfer in elastic electron–proton scattering at momentum transfers of Q 2 =2.5,5.2,6.8, and 8.54 GeV 2 . These measurements were carried out to improve knowledge of the proton electromagnetic form factor ratio R=μ p G E p ∕G M p at large values of Q 2 and to search for effects beyond the Born approximation in polarization transfer observables at Q 2 =2.5GeV 2 . The final results of both experiments were reported in a recent archival publication. A full reanalysis of the data from both experiments was carried out in order to reduce the systematic and, for the GEp-2γ experiment, statistical uncertainties. This technical note provides additional details of the final analysis omitted from the main publication, including the final evaluation of the systematic uncertainties.

Original languageEnglish
Pages (from-to)54-78
Number of pages25
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Publication statusPublished - Dec 1 2018
Externally publishedYes


  • Electromagnetic calorimeter
  • Magnetic spectrometer
  • Polarization transfer method
  • Proton form factors
  • Proton polarimeter
  • Spin transport

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation

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