Hyperon photoproduction in the nucleon resonance region

J. W C McNabb; R. A. Schumacher; L. Todor; G. Adams; E. Anciant; M. Anghinolfi; B. Asavapibhop; G. Audit; T. Auger; H. Avakian; H. Bagdasaryan; J. P. Ball; S. Barrow; M. Battaglieri; K. Beard; M. Bektasoglu; M. Bellis; B. L. Berman; N. Bianchi; A. S. Biselli; S. Boiarinov; B. E. Bonner; S. Bouchigny; R. Bradford; D. Branford; W. J. Briscoe; W. K. Brooks; V. D. Burkert; C. Butuceanu; J. R. Calarco; D. S. Carman; B. Carnahan; C. Cetina; L. Ciciani; P. L. Cole; A. Coleman; A. D. Cords; P. Corvisiero; D. Crabb; H. Crannell; J. P. Cummings; E. de Sanctis; R. DeVita; P. V. Degtyarenko; H. Denizli; L. Dennis; K. V. Dharmawardane; K. S. Dhuga; C. Djalali; G. E. Dodge; D. Doughty; P. Dragovitsch; Michael Dugger; S. Dytman; M. Eckhause; H. Egiyan; K. S. Egiyan; L. Elouadrhiri; A. Empl; P. Eugenio; R. Fatemi; R. J. Feuerbach; J. Ficenec; T. A. Forest; H. Funsten; S. J. Gaff; G. Gavalian; S. Gilad; G. P. Gilfoyle; K. L. Giovanetti; P. Girard; C. I O Gordon; K. Griffioen; M. Guidal; M. Guillo; L. Guo; V. Gyurjyan; C. Hadjidakis; R. Hakobyan; J. Hardie; D. Heddle; P. Heimberg; F. W. Hersman; K. Hicks; R. S. Hicks; M. Holtrop; J. Hu; C. E. Hyde-Wright; Y. Ilieva; M. M. Ito; D. Jenkins; K. Joo; J. H. Kelley; M. Khandaker; K. Y. Kim; K. Kim; W. Kim; A. Klein; F. J. Klein; A. V. Klimenko; M. Klusman; M. Kossov; L. H. Kramer; Y. Kuang; S. E. Kuhn; J. Lachniet; J. M. Laget; D. Lawrence; J. Li; K. Lukashin; J. J. Manak; C. Marchand; S. McAleer; J. McCarthy; B. A. Mecking; S. Mehrabyan; J. J. Melone; M. D. Mestayer; C. A. Meyer; K. Mikhailov; R. Minehart; M. Mirazita; R. Miskimen; L. Morand; S. A. Morrow; V. Muccifora; J. Mueller; G. S. Mutchler; J. Napolitano; R. Nasseripour; S. O. Nelson; S. Niccolai; G. Niculescu; I. Niculescu; B. B. Niczyporuk; R. A. Niyazov; M. Nozar; J. T. O'Brien; G. V. O'Rielly; M. Osipenko; K. Park; E. Pasyuk; G. Peterson; S. A. Philips; N. Pivnyuk; D. Pocanic; O. Pogorelko; E. Polli; S. Pozdniakov; B. M. Preedom; J. W. Price; Y. Prok; D. Protopopescu; L. M. Qin; B. P. Quinn; B. A. Raue; G. Riccardi; G. Ricco; M. Ripani; Barry Ritchie; F. Ronchetti; P. Rossi; D. Rowntree; P. D. Rubin; F. Sabatié; K. Sabourov; C. Salgado; J. P. Santoro; V. Sapunenko; V. S. Serov; A. Shafi; Y. G. Sharabian; J. Shaw; S. Simionatto; A. V. Skabelin; E. S. Smith; L. C. Smith; D. I. Sober; M. Spraker; A. Stavinsky; S. Stepanyan; P. Stoler; I. I. Strakovsky; S. Strauch; M. Taiuti; S. Taylor; D. J. Tedeschi; U. Thoma; R. Thompson; C. Tur; M. Ungaro; M. F. Vineyard; A. V. Vlassov; K. Wang; L. B. Weinstein; A. Weisberg; H. Weller; D. P. Weygand; C. S. Whisnant; E. Wolin; M. H. Wood; A. Yegneswaran; J. Yun; B. Zhang; J. Zhao; Z. Zhou

doi:10.1103/PhysRevC.69.042201

Hyperon photoproduction in the nucleon resonance region

J. W C McNabb, R. A. Schumacher, L. Todor, G. Adams, E. Anciant, M. Anghinolfi, B. Asavapibhop, G. Audit, T. Auger, H. Avakian, H. Bagdasaryan, J. P. Ball, S. Barrow, M. Battaglieri, K. Beard, M. Bektasoglu, M. Bellis, B. L. Berman, N. Bianchi, A. S. BiselliS. Boiarinov, B. E. Bonner, S. Bouchigny, R. Bradford, D. Branford, W. J. Briscoe, W. K. Brooks, V. D. Burkert, C. Butuceanu, J. R. Calarco, D. S. Carman, B. Carnahan, C. Cetina, L. Ciciani, P. L. Cole, A. Coleman, A. D. Cords, P. Corvisiero, D. Crabb, H. Crannell, J. P. Cummings, E. de Sanctis, R. DeVita, P. V. Degtyarenko, H. Denizli, L. Dennis, K. V. Dharmawardane, K. S. Dhuga, C. Djalali, G. E. Dodge, D. Doughty, P. Dragovitsch, Michael Dugger, S. Dytman, M. Eckhause, H. Egiyan, K. S. Egiyan, L. Elouadrhiri, A. Empl, P. Eugenio, R. Fatemi, R. J. Feuerbach, J. Ficenec, T. A. Forest, H. Funsten, S. J. Gaff, G. Gavalian, S. Gilad, G. P. Gilfoyle, K. L. Giovanetti, P. Girard, C. I O Gordon, K. Griffioen, M. Guidal, M. Guillo, L. Guo, V. Gyurjyan, C. Hadjidakis, R. Hakobyan, J. Hardie, D. Heddle, P. Heimberg, F. W. Hersman, K. Hicks, R. S. Hicks, M. Holtrop, J. Hu, C. E. Hyde-Wright, Y. Ilieva, M. M. Ito, D. Jenkins, K. Joo, J. H. Kelley, M. Khandaker, K. Y. Kim, K. Kim, W. Kim, A. Klein, F. J. Klein, A. V. Klimenko, M. Klusman, M. Kossov, L. H. Kramer, Y. Kuang, S. E. Kuhn, J. Lachniet, J. M. Laget, D. Lawrence, J. Li, K. Lukashin, J. J. Manak, C. Marchand, S. McAleer, J. McCarthy, B. A. Mecking, S. Mehrabyan, J. J. Melone, M. D. Mestayer, C. A. Meyer, K. Mikhailov, R. Minehart, M. Mirazita, R. Miskimen, L. Morand, S. A. Morrow, V. Muccifora, J. Mueller, G. S. Mutchler, J. Napolitano, R. Nasseripour, S. O. Nelson, S. Niccolai, G. Niculescu, I. Niculescu, B. B. Niczyporuk, R. A. Niyazov, M. Nozar, J. T. O'Brien, G. V. O'Rielly, M. Osipenko, K. Park, E. Pasyuk, G. Peterson, S. A. Philips, N. Pivnyuk, D. Pocanic, O. Pogorelko, E. Polli, S. Pozdniakov, B. M. Preedom, J. W. Price, Y. Prok, D. Protopopescu, L. M. Qin, B. P. Quinn, B. A. Raue, G. Riccardi, G. Ricco, M. Ripani, Barry Ritchie, F. Ronchetti, P. Rossi, D. Rowntree, P. D. Rubin, F. Sabatié, K. Sabourov, C. Salgado, J. P. Santoro, V. Sapunenko, V. S. Serov, A. Shafi, Y. G. Sharabian, J. Shaw, S. Simionatto, A. V. Skabelin, E. S. Smith, L. C. Smith, D. I. Sober, M. Spraker, A. Stavinsky, S. Stepanyan, P. Stoler, I. I. Strakovsky, S. Strauch, M. Taiuti, S. Taylor, D. J. Tedeschi, U. Thoma, R. Thompson, C. Tur, M. Ungaro, M. F. Vineyard, A. V. Vlassov, K. Wang, L. B. Weinstein, A. Weisberg, H. Weller, D. P. Weygand, C. S. Whisnant, E. Wolin, M. H. Wood, A. Yegneswaran, J. Yun, B. Zhang, J. Zhao, Z. Zhou

Research output: Contribution to journal › Article › peer-review

179 Scopus citations

Abstract

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.

Original language	English (US)
Article number	042201
Pages (from-to)	042201-1-042201-5
Journal	Physical Review C - Nuclear Physics
Volume	69
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevC.69.042201
State	Published - Apr 2004

ASJC Scopus subject areas

Nuclear and High Energy Physics

Access to Document

10.1103/PhysRevC.69.042201

Cite this

McNabb, J. W. C., Schumacher, R. A., Todor, L., Adams, G., Anciant, E., Anghinolfi, M., Asavapibhop, B., Audit, G., Auger, T., Avakian, H., Bagdasaryan, H., Ball, J. P., Barrow, S., Battaglieri, M., Beard, K., Bektasoglu, M., Bellis, M., Berman, B. L., Bianchi, N., ... Zhou, Z. (2004). Hyperon photoproduction in the nucleon resonance region. Physical Review C - Nuclear Physics, 69(4), 042201-1-042201-5. [042201]. https://doi.org/10.1103/PhysRevC.69.042201

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, Klusman, M, Kossov, M, Kramer, LH, Kuang, Y, Kuhn, SE, Lachniet, J, Laget, JM, Lawrence, D, Li, J, Lukashin, K, Manak, JJ, Marchand, C, McAleer, S, McCarthy, J, Mecking, BA, Mehrabyan, S, Melone, JJ, Mestayer, MD, Meyer, CA, Mikhailov, K, Minehart, R, Mirazita, M, Miskimen, R, Morand, L, Morrow, SA, Muccifora, V, Mueller, J, Mutchler, GS, Napolitano, J, Nasseripour, R, Nelson, SO, Niccolai, S, Niculescu, G, Niculescu, I, Niczyporuk, BB, Niyazov, RA, Nozar, M, O'Brien, JT, O'Rielly, GV, Osipenko, M, Park, K, Pasyuk, E, Peterson, G, Philips, SA, Pivnyuk, N, Pocanic, D, Pogorelko, O, Polli, E, Pozdniakov, S, Preedom, BM, Price, JW, Prok, Y, Protopopescu, D, Qin, LM, Quinn, BP, Raue, BA, Riccardi, G, Ricco, G, Ripani, M, Ritchie, B, Ronchetti, F, Rossi, P, Rowntree, D, Rubin, PD, Sabatié, F, Sabourov, K, Salgado, C, Santoro, JP, Sapunenko, V, Serov, VS, Shafi, A, Sharabian, YG, Shaw, J, Simionatto, S, Skabelin, AV, Smith, ES, Smith, LC, Sober, DI, Spraker, M, Stavinsky, A, Stepanyan, S, Stoler, P, Strakovsky, II, Strauch, S, Taiuti, M, Taylor, S, Tedeschi, DJ, Thoma, U, Thompson, R, Tur, C, Ungaro, M, Vineyard, MF, Vlassov, AV, Wang, K, Weinstein, LB, Weisberg, A, Weller, H, Weygand, DP, Whisnant, CS, Wolin, E, Wood, MH, Yegneswaran, A, Yun, J, Zhang, B, Zhao, J & Zhou, Z 2004, 'Hyperon photoproduction in the nucleon resonance region', Physical Review C - Nuclear Physics, vol. 69, no. 4, 042201, pp. 042201-1-042201-5. https://doi.org/10.1103/PhysRevC.69.042201

@article{623d1371ae28486dad43b1093b94dd7a,

title = "Hyperon photoproduction in the nucleon resonance region",

abstract = "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.",

author = "McNabb, {J. W C} and Schumacher, {R. A.} and L. Todor and G. Adams and E. Anciant and M. Anghinolfi and B. Asavapibhop and G. Audit and T. Auger and H. Avakian and H. Bagdasaryan and Ball, {J. P.} and S. Barrow and M. Battaglieri and K. Beard and M. Bektasoglu and M. Bellis and Berman, {B. L.} and N. Bianchi and Biselli, {A. S.} and S. Boiarinov and Bonner, {B. E.} and S. Bouchigny and R. Bradford and D. Branford and Briscoe, {W. J.} and Brooks, {W. K.} and Burkert, {V. D.} and C. Butuceanu and Calarco, {J. R.} and Carman, {D. S.} and B. Carnahan and C. Cetina and L. Ciciani and Cole, {P. L.} and A. Coleman and Cords, {A. D.} and P. Corvisiero and D. Crabb and H. Crannell and Cummings, {J. P.} and {de Sanctis}, E. and R. DeVita and Degtyarenko, {P. V.} and H. Denizli and L. Dennis and Dharmawardane, {K. V.} and Dhuga, {K. S.} and C. Djalali and Dodge, {G. E.} and D. Doughty and P. Dragovitsch and Michael Dugger and S. Dytman and M. Eckhause and H. Egiyan and Egiyan, {K. S.} and L. Elouadrhiri and A. Empl and P. Eugenio and R. Fatemi and Feuerbach, {R. J.} and J. Ficenec and Forest, {T. A.} and H. Funsten and Gaff, {S. J.} and G. Gavalian and S. Gilad and Gilfoyle, {G. P.} and Giovanetti, {K. L.} and P. Girard and Gordon, {C. I O} and K. Griffioen and M. Guidal and M. Guillo and L. Guo and V. Gyurjyan and C. Hadjidakis and R. Hakobyan and J. Hardie and D. Heddle and P. Heimberg and Hersman, {F. W.} and K. Hicks and Hicks, {R. S.} and M. Holtrop and J. Hu and Hyde-Wright, {C. E.} and Y. Ilieva and Ito, {M. M.} and D. Jenkins and K. Joo and Kelley, {J. H.} and M. Khandaker and Kim, {K. Y.} and K. Kim and W. Kim and A. Klein and Klein, {F. J.} and Klimenko, {A. V.} and M. Klusman and M. Kossov and Kramer, {L. H.} and Y. Kuang and Kuhn, {S. E.} and J. Lachniet and Laget, {J. M.} and D. Lawrence and J. Li and K. Lukashin and Manak, {J. J.} and C. Marchand and S. McAleer and J. McCarthy and Mecking, {B. A.} and S. Mehrabyan and Melone, {J. J.} and Mestayer, {M. D.} and Meyer, {C. A.} and K. Mikhailov and R. Minehart and M. Mirazita and R. Miskimen and L. Morand and Morrow, {S. A.} and V. Muccifora and J. Mueller and Mutchler, {G. S.} and J. Napolitano and R. Nasseripour and Nelson, {S. O.} and S. Niccolai and G. Niculescu and I. Niculescu and Niczyporuk, {B. B.} and Niyazov, {R. A.} and M. Nozar and O'Brien, {J. T.} and O'Rielly, {G. V.} and M. Osipenko and K. Park and E. Pasyuk and G. Peterson and Philips, {S. A.} and N. Pivnyuk and D. Pocanic and O. Pogorelko and E. Polli and S. Pozdniakov and Preedom, {B. M.} and Price, {J. W.} and Y. Prok and D. Protopopescu and Qin, {L. M.} and Quinn, {B. P.} and Raue, {B. A.} and G. Riccardi and G. Ricco and M. Ripani and Barry Ritchie and F. Ronchetti and P. Rossi and D. Rowntree and Rubin, {P. D.} and F. Sabati{\'e} and K. Sabourov and C. Salgado and Santoro, {J. P.} and V. Sapunenko and Serov, {V. S.} and A. Shafi and Sharabian, {Y. G.} and J. Shaw and S. Simionatto and Skabelin, {A. V.} and Smith, {E. S.} and Smith, {L. C.} and Sober, {D. I.} and M. Spraker and A. Stavinsky and S. Stepanyan and P. Stoler and Strakovsky, {I. I.} and S. Strauch and M. Taiuti and S. Taylor and Tedeschi, {D. J.} and U. Thoma and R. Thompson and C. Tur and M. Ungaro and Vineyard, {M. F.} and Vlassov, {A. V.} and K. Wang and Weinstein, {L. B.} and A. Weisberg and H. Weller and Weygand, {D. P.} and Whisnant, {C. S.} and E. Wolin and Wood, {M. H.} and A. Yegneswaran and J. Yun and B. Zhang and J. Zhao and Z. Zhou",

year = "2004",

month = apr,

doi = "10.1103/PhysRevC.69.042201",

language = "English (US)",

volume = "69",

pages = "042201--1--042201--5",

journal = "Physical Review C - Nuclear Physics",

issn = "0556-2813",

publisher = "American Physical Society",

number = "4",

}

TY - JOUR

T1 - Hyperon photoproduction in the nucleon resonance region

AU - McNabb, J. W C

AU - Schumacher, R. A.

AU - Todor, L.

AU - Adams, G.

AU - Anciant, E.

AU - Anghinolfi, M.

AU - Asavapibhop, B.

AU - Audit, G.

AU - Auger, T.

AU - Avakian, H.

AU - Bagdasaryan, H.

AU - Ball, J. P.

AU - Barrow, S.

AU - Battaglieri, M.

AU - Beard, K.

AU - Bektasoglu, M.

AU - Bellis, M.

AU - Berman, B. L.

AU - Bianchi, N.

AU - Biselli, A. S.

AU - Boiarinov, S.

AU - Bonner, B. E.

AU - Bouchigny, S.

AU - Bradford, R.

AU - Branford, D.

AU - Briscoe, W. J.

AU - Brooks, W. K.

AU - Burkert, V. D.

AU - Butuceanu, C.

AU - Calarco, J. R.

AU - Carman, D. S.

AU - Carnahan, B.

AU - Cetina, C.

AU - Ciciani, L.

AU - Cole, P. L.

AU - Coleman, A.

AU - Cords, A. D.

AU - Corvisiero, P.

AU - Crabb, D.

AU - Crannell, H.

AU - Cummings, J. P.

AU - de Sanctis, E.

AU - DeVita, R.

AU - Degtyarenko, P. V.

AU - Denizli, H.

AU - Dennis, L.

AU - Dharmawardane, K. V.

AU - Dhuga, K. S.

AU - Djalali, C.

AU - Dodge, G. E.

AU - Doughty, D.

AU - Dragovitsch, P.

AU - Dugger, Michael

AU - Dytman, S.

AU - Eckhause, M.

AU - Egiyan, H.

AU - Egiyan, K. S.

AU - Elouadrhiri, L.

AU - Empl, A.

AU - Eugenio, P.

AU - Fatemi, R.

AU - Feuerbach, R. J.

AU - Ficenec, J.

AU - Forest, T. A.

AU - Funsten, H.

AU - Gaff, S. J.

AU - Gavalian, G.

AU - Gilad, S.

AU - Gilfoyle, G. P.

AU - Giovanetti, K. L.

AU - Girard, P.

AU - Gordon, C. I O

AU - Griffioen, K.

AU - Guidal, M.

AU - Guillo, M.

AU - Guo, L.

AU - Gyurjyan, V.

AU - Hadjidakis, C.

AU - Hakobyan, R.

AU - Hardie, J.

AU - Heddle, D.

AU - Heimberg, P.

AU - Hersman, F. W.

AU - Hicks, K.

AU - Hicks, R. S.

AU - Holtrop, M.

AU - Hu, J.

AU - Hyde-Wright, C. E.

AU - Ilieva, Y.

AU - Ito, M. M.

AU - Jenkins, D.

AU - Joo, K.

AU - Kelley, J. H.

AU - Khandaker, M.

AU - Kim, K. Y.

AU - Kim, K.

AU - Kim, W.

AU - Klein, A.

AU - Klein, F. J.

AU - Klimenko, A. V.

AU - Klusman, M.

AU - Kossov, M.

AU - Kramer, L. H.

AU - Kuang, Y.

AU - Kuhn, S. E.

AU - Lachniet, J.

AU - Laget, J. M.

AU - Lawrence, D.

AU - Li, J.

AU - Lukashin, K.

AU - Manak, J. J.

AU - Marchand, C.

AU - McAleer, S.

AU - McCarthy, J.

AU - Mecking, B. A.

AU - Mehrabyan, S.

AU - Melone, J. J.

AU - Mestayer, M. D.

AU - Meyer, C. A.

AU - Mikhailov, K.

AU - Minehart, R.

AU - Mirazita, M.

AU - Miskimen, R.

AU - Morand, L.

AU - Morrow, S. A.

AU - Muccifora, V.

AU - Mueller, J.

AU - Mutchler, G. S.

AU - Napolitano, J.

AU - Nasseripour, R.

AU - Nelson, S. O.

AU - Niccolai, S.

AU - Niculescu, G.

AU - Niculescu, I.

AU - Niczyporuk, B. B.

AU - Niyazov, R. A.

AU - Nozar, M.

AU - O'Brien, J. T.

AU - O'Rielly, G. V.

AU - Osipenko, M.

AU - Park, K.

AU - Pasyuk, E.

AU - Peterson, G.

AU - Philips, S. A.

AU - Pivnyuk, N.

AU - Pocanic, D.

AU - Pogorelko, O.

AU - Polli, E.

AU - Pozdniakov, S.

AU - Preedom, B. M.

AU - Price, J. W.

AU - Prok, Y.

AU - Protopopescu, D.

AU - Qin, L. M.

AU - Quinn, B. P.

AU - Raue, B. A.

AU - Riccardi, G.

AU - Ricco, G.

AU - Ripani, M.

AU - Ritchie, Barry

AU - Ronchetti, F.

AU - Rossi, P.

AU - Rowntree, D.

AU - Rubin, P. D.

AU - Sabatié, F.

AU - Sabourov, K.

AU - Salgado, C.

AU - Santoro, J. P.

AU - Sapunenko, V.

AU - Serov, V. S.

AU - Shafi, A.

AU - Sharabian, Y. G.

AU - Shaw, J.

AU - Simionatto, S.

AU - Skabelin, A. V.

AU - Smith, E. S.

AU - Smith, L. C.

AU - Sober, D. I.

AU - Spraker, M.

AU - Stavinsky, A.

AU - Stepanyan, S.

AU - Stoler, P.

AU - Strakovsky, I. I.

AU - Strauch, S.

AU - Taiuti, M.

AU - Taylor, S.

AU - Tedeschi, D. J.

AU - Thoma, U.

AU - Thompson, R.

AU - Tur, C.

AU - Ungaro, M.

AU - Vineyard, M. F.

AU - Vlassov, A. V.

AU - Wang, K.

AU - Weinstein, L. B.

AU - Weisberg, A.

AU - Weller, H.

AU - Weygand, D. P.

AU - Whisnant, C. S.

AU - Wolin, E.

AU - Wood, M. H.

AU - Yegneswaran, A.

AU - Yun, J.

AU - Zhang, B.

AU - Zhao, J.

AU - Zhou, Z.

PY - 2004/4

Y1 - 2004/4

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=80051546303&partnerID=8YFLogxK

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U2 - 10.1103/PhysRevC.69.042201

DO - 10.1103/PhysRevC.69.042201

M3 - Article

AN - SCOPUS:80051546303

VL - 69

SP - 042201-1-042201-5

JO - Physical Review C - Nuclear Physics

JF - Physical Review C - Nuclear Physics

SN - 0556-2813

IS - 4

M1 - 042201

ER -

Hyperon photoproduction in the nucleon resonance region

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