The ep → e′pη reaction at and above the S11 (1535) baryon resonance

R. Thompson, S. Dytman, K. Y. Kim, J. Mueller, G. S. Adams, M. J. Amaryan, E. Anciant, M. Anghinolfi, B. Asavapibhop, T. Auger, G. Audit, H. Avakian, S. Barrow, M. Battaglieri, K. Beard, M. Bektasoglu, W. Bertozzi, N. Bianchi, A. Biselli, S. BoiarinovB. E. Bonner, W. J. Briscoe, W. Brooks, V. D. Burkert, J. R. Calarco, G. Capitani, D. S. Carman, B. Carnahan, P. L. Cole, A. Coleman, J. Connelly, D. Cords, P. Corvisiero, D. Crabb, H. Crannell, J. Cummings, D. Day, P. V. Degtyarenko, R. A. Demirchyan, L. C. Dennis, A. Deppman, E. De Sanctis, R. De Vita, K. S. Dhuga, C. Djalali, G. E. Dodge, D. Doughty, P. Dragovitsch, Michael Dugger, M. Eckhause, Y. V. Efremenko, H. Egiyan, K. S. Egiyan, E. Elouadrhiri, L. Farhi, R. J. Feuerbach, J. Ficenec, K. Fissum, A. Freyberger, H. Funsten, M. Gai, V. B. Gavrilov, G. P. Gilfoyle, K. Giovanetti, S. Gilad, P. Girard, K. A. Griffioen, M. Guidal, M. Guillo, V. Gyurjyan, D. Hancock, J. Hardie, D. Heddle, J. Heisenberg, F. W. Hersman, K. Hicks, R. S. Hicks, M. Holtrop, C. E. Hyde-Wright, M. M. Ito, D. Jenkins, K. Joo, J. Kane, M. Khandaker, W. Kim, A. Klein, F. J. Klein, M. Klusman, M. Kossov, S. E. Kuhn, Y. Kuang, J. M. Laget, D. Lawrence, G. A. Leskin, A. Longhi, K. Loukachine, M. Lucas, R. Magahiz, R. W. Major, J. J. Manak, C. Marchand, S. K. Matthews, S. McAleer, J. McCarthy, J. W C McNabb, B. A. Mecking, M. D. Mestayer, C. A. Meyer, R. Minehart, M. Mirazita, R. Miskimen, V. Muccifora, G. S. Mutchler, J. Napolitano, R. A. Niyazov, M. S. Ohandjanyan, J. T. O'Brien, A. Opper, Y. Patois, G. A. Peterson, S. Philips, N. Pivnyuk, D. Pocanic, O. Pogorelko, E. Polli, B. M. Preedom, J. W. Price, E. M. Qin, B. A. Raue, A. R. Reolon, G. Riccardi, G. Ricco, M. Ripani, Barry Ritchie, F. Ronchetti, P. Rossi, F. Roudot, D. Rowntree, P. D. Rubin, C. W. Salgado, M. Sanzone, V. Sapunenko, A. Sarty, M. Sargsyan, R. A. Schumacher, A. Shafi, Y. G. Sharabian, J. Shaw, S. M. Shuvalov, A. Skabelin, T. Smith, C. Smith, E. S. Smith, D. I. Sober, M. Spraker, S. Stepanyan, P. Stoler, M. Taiuti, S. Taylor, D. Tedeschi, T. Y. Tung, M. F. Vineyard, A. Vlassov, H. Weller, L. B. Weinstein, R. Welsh, D. P. Weygand, S. Whisnant, M. Witkowski, E. Wolin, A. Yegneswaran, J. Yun, Z. Zhou, J. Zhao

Research output: Contribution to journalArticlepeer-review

125 Scopus citations


New cross sections for the reaction ep → epη are reported for total center of mass energy W = 1.5-1.86 GeV and invariant momentum transfer Q2 = 0.25-1.5 (GeV/c)2. This large kinematic range allows extraction of important new information about response functions, photocouplings, and ηN coupling strengths of baryon resonances. Newly observed structure at W ∼ 1.65 GeV is shown to come from interference between S and P waves and can be interpreted with known resonances. Improved values are derived for the photon coupling amplitude for the S11 (1535) resonance.

Original languageEnglish (US)
Pages (from-to)1702-1706
Number of pages5
JournalPhysical Review Letters
Issue number9
StatePublished - Feb 26 2001

ASJC Scopus subject areas

  • General Physics and Astronomy


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