Hyperon photoproduction in the nucleon resonance region


Journal Article

High-statistics cross sections and recoil polarizations for the reactions γ+p → K+ + Λ and γ+p → K+ Σ0 have been measured at CLAS for center-of-mass energies between 1.6 and 2.3 GeV. In the K+λ channel we confirm a resonance-like structure near W= 1.9 GeV at backward kaon angles. Our data show more complex s-and u- channel behavior than previously seen, since structure is also present at forward angles, but not at central angles. The position and width change with angle, indicating that more than one resonance is playing a role. Large positive Λ polarization at backward angles, which is also energy dependent, is consistent with sizable s- or u-channel contributions. Presently available model calculations cannot explain these aspects of the data.

Full Text

Duke Authors

Cited Authors

  • McNabb, JWC; Schumacher, RA; Todor, L; Adams, G; Anciant, E; Anghinolfi, M; Asavapibhop, B; Audit, G; Auger, T; Avakian, H; Bagdasaryan, H; Ball, JP; Barrow, S; Battaglieri, M; Beard, K; Bektasoglu, M; Bellis, M; Berman, BL; Bianchi, N; Biselli, AS; Boiarinov, S; Bonner, BE; Bouchigny, S; Bradford, R; Branford, D; Briscoe, WJ; Brooks, WK; Burkert, VD; Butuceanu, C; Calarco, JR; Carman, DS; Carnahan, B; Cetina, C; Ciciani, L; Cole, PL; Coleman, A; Cords, AD; Corvisiero, P; Crabb, D; Crannell, H; Cummings, JP; de Sanctis, E; DeVita, R; Degtyarenko, PV; Denizli, H; Dennis, L; Dharmawardane, KV; Dhuga, KS; Djalali, C; Dodge, GE; Doughty, D; Dragovitsch, P; Dugger, M; Dytman, S; Eckhause, M; Egiyan, H; Egiyan, KS; Elouadrhiri, L; Empl, A; Eugenio, P; Fatemi, R; Feuerbach, RJ; Ficenec, J; Forest, TA; Funsten, H; Gaff, SJ; Gavalian, G; Gilad, S; Gilfoyle, GP; Giovanetti, KL; Girard, P; Gordon, CIO; Griffioen, K; Guidal, M; Guillo, M; Guo, L; Gyurjyan, V; Hadjidakis, C; Hakobyan, R; Hardie, J; Heddle, D; Heimberg, P; Hersman, FW; Hicks, K; Hicks, RS; Holtrop, M; Hu, J; Hyde-Wright, CE; Ilieva, Y; Ito, MM; Jenkins, D; Joo, K; Kelley, JH; Khandaker, M; Kim, KY; Kim, K; Kim, W; Klein, A; Klein, FJ; Klimenko, AV

Published Date

  • January 1, 2004

Published In

Volume / Issue

  • 69 / 4

Electronic International Standard Serial Number (EISSN)

  • 1089-490X

International Standard Serial Number (ISSN)

  • 0556-2813

Digital Object Identifier (DOI)

  • 10.1103/PhysRevC.69.042201

Citation Source

  • Scopus