P. Rimal, Florida International University
D. Adikaram, Old Dominion University
B. A. Raue, Florida International University
L. B. Weinstein, Old Dominion University
J. Arrington, Argonne National Laboratory
W. K. Brooks, Universidad Técnica Federico Santa María
M. Ungaro, Thomas Jefferson National Accelerator Facility
K. P. Adhikari, Old Dominion University
A. V. Afanasev, The George Washington University
Z. Akbar, Florida State University
S. Anefalos Pereira, Istituto Nazionale di Fisica Nucleare, Italy
R. A. Badui, Florida International University
J. Ball, Catholic University of America
N. A. Baltzell, Thomas Jefferson National Accelerator Facility
M. Battaglieri, Instituto Nazionale di Fisica Nucleare, Italy
V. Batourine, Thomas Jefferson National Accelerator Facility
I. Bedlinskiy, Institute of Theoretical and Experimental Physics, Russia
A. S. Biselli, Fairfield University
S. Boiarinov, Thomas Jefferson National Accelerator Facility
W. J. Briscoe, George Washington University
S. Bültmann, Old Dominion University
V. D. Burkert, Thomas Jefferson National Accelerator Facility
D. S. Carman, Thomas Jefferson National Accelerator Facility
A. Celentano, Istituto Nazionale di Fisica Nucleare, Italy
T. Chetry, Ohio University
G. Ciullo, Istituto Nazionale di Fisica Nucleare, Italy
L. Clark, University of Glasgow, UK
L. Colaneri, Istituto Nazionale di Fisica Nucleare, Italy
P. L. Cole, Thomas Jefferson National Accelerator Facility
N. Compton, Ohio University
Wesley P. Gohn, University of KentuckyFollow


Background: The electromagnetic form factors of the proton measured by unpolarized and polarized electron scattering experiments show a significant disagreement that grows with the squared four-momentum transfer (Q2). Calculations have shown that the two measurements can be largely reconciled by accounting for the contributions of two-photon exchange (TPE). TPE effects are not typically included in the standard set of radiative corrections since theoretical calculations of the TPE effects are highly model dependent, and, until recently, no direct evidence of significant TPE effects has been observed.

Purpose: We measured the ratio of positron-proton to electron-proton elastic-scattering cross sections in order to determine the TPE contribution to elastic electron-proton scattering and thereby resolve the proton electric form factor discrepancy.

Methods: We produced a mixed simultaneous electron-positron beam in Jefferson Lab's Hall B by passing the 5.6-GeV primary electron beam through a radiator to produce a bremsstrahlung photon beam and then passing the photon beam through a convertor to produce electron-positron pairs. The mixed electron-positron (lepton) beam with useful energies from approximately 0.85 to 3.5 GeV then struck a 30-cm-long liquid hydrogen (LH2) target located within the CEBAF Large Acceptance Spectrometer (CLAS). By detecting both the scattered leptons and the recoiling protons, we identified and reconstructed elastic scattering events and determined the incident lepton energy. A detailed description of the experiment is presented.

Results: We present previously unpublished results for the quantity R2γ, the TPE correction to the elastic-scattering cross section, at Q2 ≈ 0.85 and 1.45 GeV2 over a large range of virtual photon polarization ɛ.

Conclusions: Our results, along with recently published results from VEPP-3, demonstrate a nonzero contribution from TPE effects and are in excellent agreement with the calculations that include TPE effects and largely reconcile the form-factor discrepancy up to Q2 ≈ 2 GeV2. These data are consistent with an increase in R2γ with decreasing ɛ at Q2 ≈ 0.85 and 1.45 GeV2. There are indications of a slight increase in R2γ with Q2.

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Notes/Citation Information

Published in Physical Review C, v. 95, issue 6, 065201, p. 1-20.

©2017 American Physical Society

The copyright holder has granted permission for posting the article here.

Due to the large number of authors, only the first 30 and the authors affiliated with the University of Kentucky are listed in the author section above. For the complete list of authors, please download this article or visit:

This group of authors is collectively known as the CLAS Collaboration.

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Funding Information

This work was supported in part by the US Department of Energy and National Science Foundation, the Italian Istituto Nazionale di Fisica Nucleare, the Chilean Comisión Nacional de Investigación Científica y Tecnológica (CONICYT), the French Centre National de la Recherche Scientifique and Commissariat à l’Energie Atomique, the Scottish Universities Physics Alliance (SUPA), the UK Science and Technology Facilities Council (STFC), and the National Research Foundation of Korea. Jefferson Science Associates, LLC, operates the Thomas Jefferson National Accelerator Facility for the United States Department of Energy under Contract No. DE-AC05-060R23177.

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