We have measured the proton recoil polarization in the ⁴He({vec}e, e'{vec}p)³H reaction at Q² = 0.5, 1.0, 1.6, and 2.6 (GeV/c)². The measured ratio of polarization transfer co-efficients differs from a fully relativistic calculation, favoring the inclusion of a predicted medium modification of the proton form factors based on a quark-meson coupling model. In contrast, the measured induced polarizations agree reasonably well with the fully relativistic calculation indicating that the treatment of final-state interactions is under control.

Authors: S. Strauch, S. Dieterich, K.A. Aniol, J.R.M. Annand, O.K. Baker, W. Bertozzi, M. Boswell, E.J. Brash, Z. Chai, J.-P. Chen, M.E. Christy, E. Chudakov, A. Cochran, R. De Leo, R. Ent, M.B. Epstein, J.M. Finn, K.G. Fissum, T.A. Forest, S. Frullani, F. Garibaldi, A. Gasparian, O. Gayou, S. Gilad, R. Gilman, C. Glashausser, J. Gomez, V. Gorbenko, P.L.J. Gueye, J.O. Hansen, D.W. Higinbotham, B. Hu, C.E. Hyde-Wright, D.G. Ireland, C. Jackson, C.W. de Jager, X. Jiang, C. Jones, M.K. Jones, J.D. Kellie, J.J. Kelly, Cynthia E. Keppel, G. Kumbartzki, Michael Kuss, J.J. LeRose, K. Livingston, Nilanga Liyanage, R.W. Lourie, S. Malov, D.J. Margaziotis, D. Meekins, R. Michaels, J.H. Mitchell, S.K. Nanda, J. Nappa, C.F. Perdrisat, Vina A. Punjabi, R.D. Ransome, R. Roche, G. Rosner, M. Rvachev, R. Sabatie, A. Saha, A. Sarty, J.M. Udias, P.E. Ulmer, G.M. Urciuoli, J.F.J can den Brand, J.R. Vignote, D.P. Watts, L.B. Weinstein, K. Wijesooriya, B. Wojtsekhowski

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