Eta photoproduction on the proton for photon energies from 0.75 to 1.95 GeV

Differential cross sections for gammap-->etap have been measured with tagged real photons for incident photon energies from 0.75 to 1.95 GeV. Mesons were identified by missing mass reconstruction using kinematical information for protons scattered in the production process. The data provide the f...

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Veröffentlicht in:	Physical review letters 2002-11, Vol.89 (22), p.222002-222002, Article 222002
Hauptverfasser:	Dugger, M, Ritchie, B G, Ball, J, Pasyuk, E, Adams, G, Anciant, E, Anghinolfi, M, Asavapibhop, B, Audit, G, Auger, T, Avakian, H, Bagdasaryan, H, Barrow, S, Battaglieri, M, Beard, K, Bektasoglu, M, Bellis, M, Berman, B L, Bianchi, N, Biselli, A S, Boiarinov, S, Bouchigny, S, Bradford, R, Branford, D, Briscoe, W J, Brooks, W K, Burkert, V D, Calarco, J R, Capitani, G P, Carman, D S, Carnahan, B, Cetina, C, Clark, R, Cole, P L, Coleman, A, Connelly, J, Cords, D, Corvisiero, P, Crabb, D, Crannell, H, Cummings, J P, DeSanctis, E, DeVita, R, Degtyarenko, P V, Denizli, H, Dennis, L, Dharmawardane, K V, Dhuga, K S, Djalali, C, Dodge, G E, Doughty, D, Dragovitsch, P, Dytman, S, Eckhause, M, Egiyan, H, Egiyan, K S, Elouadrhiri, L, Farhi, L, Fatemi, R, Feldman, G, Feuerbach, R J, Ficenec, J, Forest, T A, Frolov, V, Funsten, H, Gaff, S J, Gai, M, Gavalian, G, Gilad, S, Gilfoyle, G P, Giovanetti, K L, Girard, P, Gordon, C I O, Griffioen, K, Guidal, M, Guillo, M, Guo, L, Gyurjyan, V, Hadjidakis, C, Hancock, D, Hardie, J, Heddle, D, Heimberg, P, Hersman, F W, Hicks, K, Hicks, R S, Holtrop, M, Hyde-Wright, C E, Ito, M M, Jenkins, D, Joo, K, Kelley, J H, Kellie, J D, Khandaker, M, Kim, W, Klein, A, Klein, F J, Klusman, M, Kossov, M, Koubarovski, V
Format:	Artikel
Sprache:	eng
Schlagworte:	ANGULAR DISTRIBUTION DIFFERENTIAL CROSS SECTIONS MESONS MISSING MASS PHOTONS PHOTOPRODUCTION PHYSICS OF ELEMENTARY PARTICLES AND FIELDS PRODUCTION PROTONS QUARK MODEL RESONANCE
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Beschreibung
Zusammenfassung:	Differential cross sections for gammap-->etap have been measured with tagged real photons for incident photon energies from 0.75 to 1.95 GeV. Mesons were identified by missing mass reconstruction using kinematical information for protons scattered in the production process. The data provide the first extensive angular distribution measurements for the process above W=1.75 GeV. Comparison with preliminary results from a constituent quark model support the suggestion that a third S11 resonance with mass approximately 1.8 GeV couples to the etaN channel.
ISSN:	0031-9007 1079-7114
DOI:	10.1103/PhysRevLett.89.222002