Search for effects beyond the born approximation in polarization transfer observables in e→p elastic scattering

M. Meziane*, E. J. Brash, R. Gilman, M. K. Jones, W. Luo, L. Pentchev, C. F. Perdrisat, A. J.R. Puckett, V. Punjabi, F. R. Wesselmann, A. Ahmidouch, I. Albayrak, K. A. Aniol, J. Arrington, A. Asaturyan, O. Ates, H. Baghdasaryan, F. Benmokhtar, W. Bertozzi, L. BimbotP. Bosted, W. Boeglin, C. Butuceanu, P. Carter, S. Chernenko, E. Christy, M. Commisso, 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, Y. Goncharenko, K. Hafidi, D. Hamilton, D. W. Higinbotham, W. Hinton, T. Horn, B. Hu, J. Huang, G. M. Huber, E. Jensen, H. Kang, C. Keppel, M. Khandaker, P. King, D. Kirillov, M. Kohl, V. Kravtsov, G. Kumbartzki, Y. Li, V. Mamyan, D. J. Margaziotis, P. Markowitz, A. Marsh, Y. Matulenko, J. Maxwell, G. Mbianda, D. Meekins, Y. Melnik, J. Miller, A. Mkrtchyan, H. Mkrtchyan, B. Moffit, O. Moreno, J. Mulholland, A. Narayan, Nuruzzaman, S. Nedev, E. Piasetzky, W. Pierce, N. M. Piskunov, Y. Prok, R. D. Ransome, D. S. Razin, P. E. Reimer, J. Reinhold, O. Rondon, M. Shabestari, A. Shahinyan, K. Shestermanov, S. Åirca, I. Sitnik, L. Smykov, G. Smith, L. Solovyev, P. Solvignon, R. Subedi, R. Suleiman, E. Tomasi-Gustafsson, A. Vasiliev, M. Vanderhaeghen, M. Veilleux, B. B. Wojtsekhowski, S. Wood, Z. Ye, Y. Zanevsky, X. Zhang, Y. Zhang, X. Zheng, L. Zhu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

85 Scopus citations

Abstract

Intensive theoretical and experimental efforts over the past decade have aimed at explaining the discrepancy between data for the proton electric to magnetic form factor ratio, GE/GM, obtained separately from cross section and polarization transfer measurements. One possible explanation for this difference is a two-photon-exchange contribution. In an effort to search for effects beyond the one-photon-exchange or Born approximation, we report measurements of polarization transfer observables in the elastic H(e→,ep→) reaction for three different beam energies at a Q2=2.5GeV2, spanning a wide range of the kinematic parameter μ. The ratio R, which equals μpGE/GM in the Born approximation, is found to be independent of μ at the 1.5% level. The μ dependence of the longitudinal polarization transfer component P shows an enhancement of (2.3±0.6)% relative to the Born approximation at large μ.

Original languageEnglish
Article number132501
JournalPhysical Review Letters
Volume106
Issue number13
DOIs
StatePublished - 29 Mar 2011

Funding

FundersFunder number
National Science Foundation1019521, 0969239

    Fingerprint

    Dive into the research topics of 'Search for effects beyond the born approximation in polarization transfer observables in e→p elastic scattering'. Together they form a unique fingerprint.

    Cite this