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Publication Information
| Title | Demonstration of a novel technique to measure two-photon exchange effects in elastic $e^\pm p$ scattering | ||||
| Abstract | The discrepancy between proton electromagnetic form factors extracted using unpolarized and polarized scattering data is believed to be a consequence of two-photon exchange (TPE) effects. However, the calculations of TPE corrections have significant model dependence, and there is limited direct experimental evidence for such corrections. We present the results of a new experimental technique for making direct $e^\pm p$ comparisons, which has the potential to make precise measurements over a broad range in $Q^2$ and scattering angles. We use the Jefferson Lab electron beam and the Hall B photon tagger to generate a clean but untagged photon beam. The photon beam impinges on a converter foil to generate a mixed beam of electrons, positrons, and photons. A chicane is used to separate and recombine the electron and positron beams while the photon beam is stopped by a photon blocker. This provides a combined electron and positron beam, with energies from 0.5 to 3.2 GeV, which impinges on a | ||||
| Author(s) | Maryam Moteabbed, Megh Niroula, Brian Raue, Larry Weinstein, Dasuni Adikaram, John Arrington, Will Brooks, Jeff Lachniet, Dipak Rimal, Maurizio Ungaro, Krishna Adhikari, Mher Aghasyan, Moskov Amaryan, Harut Avagyan, Jacques Ball, Nathan Baltzell, Marco Battaglieri, Vitaly Baturin, Ivan Bedlinskiy, Robert Bennett, Angela Biselli, Jason Bono, Sergey Boyarinov, Bill Briscoe, Volker Burkert, Daniel Carman, Andrea Celentano, Shloka Chandavar, Phil Cole, Patrick Collins, Marco Contalbrigo, Olga Cortes Becerra, Volker Crede, Annalisa D'Angelo, Natalya DASHYAN, Raffaella De Vita, Enzo De Sanctis, Alexandre Deur, Chaden Djalali, Dave Doughty, Raphael Dupre, Hovanes Egiyan, Lamiaa El Fassi, Paul Eugenio, Gleb Fedotov, Stuart Fegan, Robert Fersch, Jamie Fleming, Nerses Gevorgyan, Kevin Giovanetti, Francois-Xavier Girod-Gard, John Goetz, Wesley Gohn, Evgeny Golovach, Ralf Gothe, Keith Griffioen, Michel Guidal, Nevzat Guler, Lei Guo, Kawtar Hafidi, Hayk Hakobyan, Charles Hanretty, Nathan Harrison, David Heddle, Ken Hicks, Dao Ho, Maurik Holtrop, Charles Hyde, Yordanka Ilieva, David Ireland, Boris Ishkhanov, Evgeny Isupov, Hyon-Suk Jo, Kyungseon Joo, Dustin Keller, Mahbub Khandaker, Andrey Kim, Franz Klein, Suman Koirala, Valery Kubarovsky, Sebastian Kuhn, Sergey Kuleshov, Stefanie Lewis, Haiyun Lu, Marion MacCormick, Ian Macgregor, Danny Martinez-Pieschacon, Michael Mayer, Bryan McKinnon, Taisiya Mineeva, Marco Mirazita, Viktor Mokeev, Rachel Montgomery, Kei Moriya, Herve Moutarde, Edwin Munevar Espitia, Carlos Munoz Camacho, Pawel Nadel-Turonski, Rakhsha Nasseripour, Silvia Niccolai, Gabriel Niculescu, Maria Niculescu, Mikhail Osipenko, Alexander Ostrovidov, Luciano Pappalardo, Rafayel Paremuzyan, Kijun Park, Sungkyun Park, Evan Phelps, Jeffrey Phillips, Silvia Pisano, Oleg Pogorelko, Serguei Pozdniakov, John Price, Dan Protopopescu, Andrew Puckett, Marco Ripani, Guenther Rosner, Patrizia Rossi, Franck Sabatie, Mukesh Saini, Carlos Salgado, Diane Schott, Reinhard Schumacher, Erin Seder, Helena Seraydaryan, Youri Sharabian, Elton Smith, Greg Smith, Dan Sober, Daria Sokhan, Stepan Stepanyan, Steffen Strauch, Wei Tang, Charles Taylor, Ye Tian, Svyatoslav Tkachenko, Hakob Voskanyan, Eric Voutier, Natalie Walford, Mike Wood, Nicholas Zachariou, Lorenzo Zana, Jixie Zhang, Zhiwen Zhao, Irene Zonta | ||||
| Publication Date | August 2013 | ||||
| Document Type | Journal Article | ||||
| Primary Institution | Thomas Jefferson National Accelerator Facility, Newport News | ||||
| Affiliation | Exp Nuclear Physics / Experimental Halls / Hall B | ||||
| Funding Source | |||||
| Proprietary? | No | ||||
| This publication conveys | Technical Science Results | ||||
| Document Numbers |
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| Associated with an experiment | Yes | ||||
| Experiment Number(s) |
E04-116
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| Associated with EIC | No | ||||
| Supported by Jefferson Lab LDRD Funding | No |
Journal Article
| Journal Name | Physical Review C |
| Refereed | Yes |
| Volume | 88 |
| Issue | 02 |
| Page(s) | 025210 (13 pages) |
Attachments/Datasets/DOI Link
| Document(s) |
1306.2286v2.pdf
(STI Document)
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| DOI Link | |
| Dataset(s) | (none) |
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