Differential cross sections and recoil polarizations for the reaction gamma p -> K(+)Sigma(0)

Dey, B. et al. (2010) Differential cross sections and recoil polarizations for the reaction gamma p -> K(+)Sigma(0). Physical Review C, 82(2), Art. 025202. (doi: 10.1103/PhysRevC.82.025202)

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High-statistics measurements of differential cross sections and recoil polarizations for the reaction. gamma p -> K(+)Sigma(0) have been obtained using the CLAS detector at Jefferson Lab. We cover center-of-mass energies (root s) from 1.69 to 2.84 GeV, with an extensive coverage in the K+ production angle. Independent measurements were made using the K(+) p pi(-)(gamma) and K(+) p(pi(-),gamma) final-state topologies, and were found to exhibit good agreement. Our differential cross sections show good agreement with earlier CLAS, SAPHIR, and LEPS results, while offering better statistical precision and a 300-MeV increase in root s coverage. Above root s approximate to 2.5 GeV, t- and u-channel Regge scaling behavior can be seen at forward and backward angles, respectively. Our recoil polarization (P(Sigma)) measurements represent a substantial increase in kinematic coverage and enhanced precision over previous world data. At forward angles, we find that P(Sigma) is of the same order of magnitude but opposite sign as P(A,) in agreement with the static SU(6) quark model prediction of P(Sigma) approximate to P(A). This expectation is violated in some mid-and backward-angle kinematic regimes, where P(Sigma) and P(Sigma) are of similar magnitudes but also have the same signs. In conjunction with several other meson photoproduction results recently published by CLAS, the present data will help constrain the partial-wave analyses being performed to search for missing baryon resonances.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Sokhan, Dr Daria and Fegan, Mr Stuart and Protopopescu, Dr Dan and MacGregor, Professor Douglas and McKinnon, Dr Bryan and Livingston, Dr Kenneth and Ireland, Professor David and Rosner, Professor Guenther
Authors: Dey, B., Meyer, C. A., Bellis, M., McCracken, M. E., Williams, M., Adhikari, K. P., Aghasyan, M., Anghinolfi, M., Ball, J., Battaglieri, M., Batourine, V., Bedlinskiy, I., Berman, B. L., Biselli, A. S., Branford, D., Briscoe, W. J., Brooks, W. K., Burkert, V. D., Carman, D. S., Crede, V., D'Angelo, A., De Vita, R., De Sanctis, E., Deur, A., Dhamija, S., Dickson, R., Djalali, C., Doughty, D., Dugger, M., Dupre, R., El Alaoui, A., El Fassi, L., Eugenio, P., Fegan, S., Fradi, A., Gabrielyan, M. Y., Gilfoyle, G. P., Giovanetti, K. L., Girod, F. X., Gohn, W., Gothe, R. W., Graham, L., Griffioen, K. A., Guler, N., Guo, L., Hafidi, K., Hakobyan, H., Hanretty, C., Hassall, N., Hicks, K., Holtrop, M., Ilieva, Y., Ireland, D.G., Jawalkar, S. S., Jo, H. S., Joo, K., Keller, D., Khandaker, M., Khetarpal, P., Kim, A., Kim, W., Klein, A., Klein, F. J., Konczykowski, P., Kubarovsky, V., Kuleshov, S. V., Kuznetsov, V., Livingston, K., MacGregor, I.J.D., Martinez, D., McAndrew, J., McKinnon, B., Mikhailov, K., Mirazita, M., Mokeev, V., Moreno, B., Moriya, K., Morrison, B., Moutarde, H., Munevar, E., Nadel-Turonski, P., Nasseripour, R., Nepali, C. S., Ni, A., Niccolai, S., Niculescu, G., Niculescu, I., Niroula, M. R., Osipenko, M., Ostrovidov, A. I., Paremuzyan, R., Park, K., Park, S., Pasyuk, E., Pereira, S., Pogorelko, O., Pozdniakov, S., Price, J. W., Procureur, S., Protopopescu, D., Raue, B. A., Ricco, G., Ripani, M., Ritchie, B. G., Rosner, G., Rossi, P., Salamanca, J., Salgado, C., Schott, D., Schumacher, R. A., Seder, E., Seraydaryan, H., Strauch, S., Tang, W., Taylor, C. E., Tedeschi, D. J., Tkachenko, S., Ungaro, M., Watts, D. P., Vernarsky, B., Vineyard, M. F., Voutier, E., Weinstein, L. B., Wood, M. H., Yegneswaran, A., Zhang, J., Zhao, B., Zhao, Z. W., Daniel, A., Sharabian, Y. G., Smith, E. S., Smith, G. D., Sober, D. I., Sokhan, D., Stepanyan, S. S., and Strakovsky, I. I.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physical Review C
ISSN (Online):1089-490X)
Published Online:06 August 2010

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