The Ep -> E'P Eta Reaction At And Above The S-11(1535) Baryon Resonance

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

PHYSICAL REVIEW LETTERS（2001）

Cited 160|Views47

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Abstract

New cross sections for the reaction ep --> ep eta are reported for total center of mass energy W = 1.5-1.86 GeV and invariant momentum transfer Q(2) = 0.25-1.5 (GeV/c)(2). This large kinematic range allows extraction of important new information about response functions, photocouplings, and etaN coupling strengths of baryon resonances. Newly observed structure at W similar to 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 S-11(1535) resonance.

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