Data Analysis Techniques, Differential Cross Sections, and Spin Density Matrix Elements for the Reaction Gamma p -> phi p
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.
- Dey, 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)