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High-statistics measurements of differential cross sections and spin density matrix elements for the reaction γp → ϕp have been made using the CLAS detector at Jefferson Lab. We cover center-of-mass energies (√s) from 1.97 to 2.84 GeV, with an extensive coverage in the ϕ production angle. The high statistics of

High-statistics measurements of differential cross sections and spin density matrix elements for the reaction γp → ϕp have been made using the CLAS detector at Jefferson Lab. We cover center-of-mass energies (√s) from 1.97 to 2.84 GeV, with an extensive coverage in the ϕ production angle. The high statistics of the data sample made it necessary to carefully account for the interplay between the ϕ natural lineshape and effects of the detector resolution, that are found to be comparable in magnitude. We study both the charged- (ϕ → K+K-) and neutral- (ϕ → K[0 over S]K[0 over L]) K[⎯⎯⎯ over K] decay modes of the ϕ. Further, for the charged mode, we differentiate between the cases where the final K- track is directly detected or its momentum reconstructed as the total missing momentum in the event. The two charged-mode topologies and the neutral-mode have different resolutions and are calibrated against each other. Extensive usage is made of kinematic fitting to improve the reconstructed ϕ mass resolution. Our final results are reported in 10- and mostly 30-MeV-wide √s bins for the charged- and the neutral-modes, respectively. Possible effects from K+Λ* channels with pK[⎯⎯⎯ over K] final states are discussed. These present results constitute the most precise and extensive ϕ photoproduction measurements to date and in conjunction with the ω photoproduction results recently published by CLAS, will greatly improve our understanding of low energy vector meson photoproduction.

ContributorsDey, B. (Author) / Meyer, C. A. (Author) / Bellis, M. (Author) / Williams, M. (Author) / Adhikari, K. P. (Author) / Adikaram, D. (Author) / Aghasyan, M. (Author) / Amaryan, M. J. (Author) / Anderson, M. D. (Author) / Pereira, S. Anefalos (Author) / Ball, J. (Author) / Baltzell, N. A. (Author) / Battaglieri, M. (Author) / Bedlinskiy, I. (Author) / Biselli, A. S. (Author) / Bono, J. (Author) / Boiarinov, S. (Author) / Briscoe, W. J. (Author) / Brooks, W. K. (Author) / Burkert, V. D. (Author) / Carman, D. S. (Author) / Celentano, A. (Author) / Chandavar, S. (Author) / Colaneri, L. (Author) / Cole, P. L. (Author) / Contalbrigo, M. (Author) / Cortes, O. (Author) / Crede, V. (Author) / D'Angelo, A. (Author) / Dashyan, N. (Author) / De Vita, R. (Author) / De Sanctis, E. (Author) / Deur, A. (Author) / Djalali, C. (Author) / Doughty, D. (Author) / Dugger, Michael (Author) / Pasyuk, Eugene (Author) / Ritchie, Barry (Author) / Senderovich, Igor (Author) / College of Liberal Arts and Sciences (Contributor)
Created2014-05-27