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The ep$\rightarrow$e'p$\eta$ reaction at and above the S$_{11}$(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 B L. Berman 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 C. Cetina 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 Pascal Girard K A. Griffioen M. Guidal 1 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 L. Maximon 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 L. Murphy G S. Mutchler J. Napolitano R A. Niyazov M S. Ohandjanyan J T. O'Brien A. Opper Y. Patois F. Perrot-Kunne 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 M F. Taragin 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
Abstract : New cross sections for the reaction e p -> 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^2. This large kinematic range allows extraction of important new information about response functions, photocouplings, and eta N coupling strengths of baryon resonances. Expanded W coverage shows sharp structure at W \~ 1.7 GeV; this is shown to come from interference between S and P waves and can be interpreted in terms of known resonances. Improved values are derived for the photon coupling amplitude for the S11(1535) resonance.
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Submitted on : Wednesday, May 29, 2002 - 11:12:11 AM
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R. Thompson, S. Dytman, K Y. Kim, J. Mueller, G S. Adams, et al.. The ep$\rightarrow$e'p$\eta$ reaction at and above the S$_{11}$(1535) baryon resonance. Physical Review Letters, American Physical Society, 2001, 86, pp.1702-1706. ⟨in2p3-00013515⟩

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