Polarization transfer in the H2(e→,e′p→)n reaction up to Q2=1.61(GeV/c)2

B. Hu, M. K. Jones, P. E. Ulmer, H. Arenhövel, O. K. Baker, W. Bertozzi, E. J. Brash, J. Calarco, J. P. Chen, E. Chudakov, A. Cochran, S. Dumalski, R. Ent, J. M. Finn, F. Garibaldi, S. Gilad, R. Gilman, C. Glashausser, J. Gomez, V. GorbenkoJ. O. Hansen, J. Hovebo, C. W.De Jager, S. Jeschonnek, X. Jiang, C. Keppel, A. Klein, A. Kozlov, S. Kuhn, G. Kumbartzki, M. Kuss, J. J. Lerose, M. Liang, N. Liyanage, G. J. Lolos, P. E.C. Markowitz, D. Meekins, R. Michaels, J. Mitchell, Z. Papandreou, C. F. Perdrisat, V. Punjabi, R. Roche, D. Rowntree, A. Saha, S. Strauch, L. Todor, G. Urciuoli, L. B. Weinstein, K. Wijesooriya, B. B. Wojtsekhowski, R. Woo

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Abstract

The recoil proton polarization was measured in the H2(e→, e′p→)n reaction in Hall A of the Thomas Jefferson National Accelerator Facility. The electron kinematics were centered on the quasielastic peak (xBj1) and included three values of the squared four-momentum transfer, Q2=0.43,1.00 and 1.61 (GeV/c)2. For Q2=0.43 and 1.61 (GeV/c)2, the missing momentum, pm, was centered at zero, whereas for Q2=1.00(GeV/c)2 two values of pm were chosen: 0 and 174MeV/c. At low pm, the Q2 dependence of the longitudinal polarization, Pz′, is not well described by a state-of-the-art calculation. Further, at higher pm, a 3.5σ discrepancy was observed in the transverse polarization, Px′. Understanding the origin of these discrepancies is important to confidently extract the neutron electric form factor from the analogous H2(e→,e′n→)p experiment.

Original languageEnglish (US)
Article number064004
JournalPhysical Review C - Nuclear Physics
Volume73
Issue number6
DOIs
StatePublished - 2006

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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