The ep -->e'p eta 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 Boiarinov; B 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; M Dugger; M Eckhause; Y V Efremenko; H Egiyan; K S Egiyan; L 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 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; L M Qin; B A Raue; A R Reolon; G Riccardi; G Ricco; M Ripani; B G 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; CLAS Collaboration

doi:10.1103/PhysRevLett.86.1702

The ep -->e'p eta reaction at and above the S11(1535) baryon resonance

Phys Rev Lett. 2001 Feb 26;86(9):1702-6. doi: 10.1103/PhysRevLett.86.1702.

Authors

R Thompson¹, 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 Boiarinov, B 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, M Dugger, M Eckhause, Y V Efremenko, H Egiyan, K S Egiyan, L 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 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, L M Qin, B A Raue, A R Reolon, G Riccardi, G Ricco, M Ripani, B G 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; CLAS Collaboration

Affiliation

¹ Department of Physics and Astronomy, University of Pittsburgh, Pennsylvania 15260, USA.

PMID: 11290228
DOI: 10.1103/PhysRevLett.86.1702

Abstract

New cross sections for the reaction e p-->e p eta 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 eta N coupling strengths of baryon resonances. Newly observed structure at W approximately 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.