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

B. Dey, C. A. Meyer, M. Bellis, M. E. McCracken, M. Williams, K. P. Adhikari, M. Aghasyan, M. Anghinolfi, J. Ball, M. Battaglieri, V. Batourine, I. Bedlinskiy, B. L. Berman, A. S. Biselli, D. Branford, W. J. Briscoe, W. K. Brooks, V. D. Burkert, D. S. Carman, V. CredeA. D'Angelo, R. De Vita, E. De Sanctis, A. Deur, S. Dhamija, R. Dickson, C. Djalali, D. Doughty, M. Dugger, R. Dupre, A. El Alaoui, L. El Fassi, P. Eugenio, S. Fegan, A. Fradi, M. Y. Gabrielyan, G. P. Gilfoyle, K. L. Giovanetti, F. X. Girod, W. Gohn, R. W. Gothe, L. Graham, K. A. Griffioen, N. Guler, L. Guo, K. Hafidi, H. Hakobyan, C. Hanretty, N. Hassall, D. P. Watts, CLAS Collaboration

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Abstract

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,P- 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.

Original languageEnglish
Article number025202
Pages (from-to)-
Number of pages20
JournalPhysical Review C
Volume82
Issue number2
DOIs
Publication statusPublished - 6 Aug 2010

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