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Journal articles
Measurement of two-photon exchange effect by comparing elastic $e^\pm p$ cross sections
D. Rimal
D. Adikaram
B. A. Raue
L. B. Weinstein
J. Arrington
W. K. Brooks
M. Ungaro
K. P. Adhikari
Z. Akbar
S. Anefalos Pereira
R. A. Badui
J. Ball
N. A. Baltzell
M. Battaglieri
V. Batourine
I. Bedlinskiy
R. P. Bennett
A. S. Biselli
S. Boiarinov
W. J. Briscoe
S. Bültmann
D. S. Carman
A. Celentano
T. Chetry
G. Ciullo
L. Clark
L. Colaneri
P. L. Cole
N. Compton
M. Contalbrigo
O. Cortes
V. Crede
A. d'Angelo
N. Dashyan
R. de Vita
A. Deur
C. Djalali
R. Dupre
1
H. Egiyan
A. El Alaoui
L. El Fassi
P. Eugenio
G. Fedotov
R. Fersch
A. Filippi
J. A. Fleming
T. A. Forest
A. Fradi
1
N. Gevorgyan
Y. Ghandilyan
G. P. Gilfoyle
K. L. Giovanetti
F. X. Girod
C. Gleason
W. Gohn
E. Golovatch
R. W. Gothe
K. A. Griffioen
L. Guo
K. Hafidi
C. Hanretty
N. Harrison
M. Hattawy
D. Heddle
K. Hicks
M. Holtrop
S. M. Hughes
Y. Ilieva
D. G. Ireland
B. S. Ishkhanov
E. L. Isupov
D. Jenkins
H. Jiang
S. Joosten
D. Keller
P. Khetarpal
G. Khachatryan
M. Khandaker
W. Kim
A. Klein
F. J. Klein
V. Kubarovsky
S. E. Kuhn
S. V. Kuleshov
L. Lanza
P. Lenisa
K. Livingston
H. Y. Lu
I . J . D. Macgregor
N. Markov
B. Mckinnon
M. D. Mestayer
M. Mirazita
V. Mokeev
A Movsisyan
E. Munevar
C. Munoz Camacho
1
P. Nadel-Turonski
A. Ni
S. Niccolai
1
G. Niculescu
I. Niculescu
M. Osipenko
A. I. Ostrovidov
M. Paolone
R. Paremuzyan
K. Park
E. Pasyuk
W. Phelps
S. Pisano
O. Pogorelko
J. W. Price
Y. Prok
D. Protopopescu
A. J. R. Puckett
A. Rizzo
G. Rosner
P. Rossi
P. Roy
F. Sabatié
C. Salgado
R. A. Schumacher
E. Seder
Y. G. Sharabian
Iu. Skorodumina
G. D. Smith
D. Sokhan
N. Sparveris
Ivana Stankovic
S. Stepanyan
S. Strauch
V. Sytnik
M. Taiuti
B. Torayev
H. Voskanyan
E. Voutier
2, 1
N. K. Walford
D. P. Watts
X. Wei
M. H. Wood
N. Zachariou
L. Zana
J. Zhang
Z. W. Zhao
I. Zonta
I. Zonta
Author
1
IPNO - Institut de Physique Nucléaire d'Orsay (IPN - 15, rue Georges Clemenceau - 91406 ORSAY CEDEX - France)
- UP11 - Université Paris-Sud - Paris 11 (Bâtiment 300 - 91405 Orsay cedex - France)
- IN2P3 - Institut National de Physique Nucléaire et de Physique des Particules du CNRS (France)
- CNRS - Centre National de la Recherche Scientifique : UMR8608 (France)
2
LPSC - Laboratoire de Physique Subatomique et de Cosmologie (53 avenue des Martyrs - 38026 Grenoble Cedex - France)
- CNRS - Centre National de la Recherche Scientifique : UMR5821 (France)
- UJF - Université Joseph Fourier - Grenoble 1 (BP 53 - 38041 Grenoble Cedex 9 - France)
- IN2P3 - Institut National de Physique Nucléaire et de Physique des Particules du CNRS (France)
- Institut Polytechnique de Grenoble - Grenoble Institute of Technology (France)
- UGA - Université Grenoble Alpes (CS 40700 - 38058 Grenoble cedex - France)
- Grenoble INP - Institut polytechnique de Grenoble - Grenoble Institute of Technology (46 avenue Félix Viallet 38031 Grenoble Cedex 1 - France)
Abstract : [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 ($Q^{2}$). 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 (LH$_2$) 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.
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http://hal.in2p3.fr/in2p3-01281912
Contributor : Emmanuelle Vernay <>
Submitted on : Thursday, March 3, 2016 - 8:27:36 AM
Last modification on : Friday, April 3, 2020 - 11:44:49 AM
Contributor : Emmanuelle Vernay <>
Submitted on : Thursday, March 3, 2016 - 8:27:36 AM
Last modification on : Friday, April 3, 2020 - 11:44:49 AM
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- HAL Id : in2p3-01281912, version 1
- ARXIV : 1603.00315
- DOI : 10.1103/PhysRevC.95.065201
Citation
D. Rimal, D. Adikaram, B. A. Raue, L. B. Weinstein, J. Arrington, et al.. Measurement of two-photon exchange effect by comparing elastic $e^\pm p$ cross sections. Physical Review C, American Physical Society, 2017, 95, pp.065201 ⟨10.1103/PhysRevC.95.065201⟩. ⟨in2p3-01281912⟩
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