Data analysis techniques, differential cross sections, and spin density matrix elements for the reaction γ p → ϕ p
Author(s)
Williams, Michael
DownloadPublished version (2.469Mb)
Publisher Policy
Publisher Policy
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Terms of use
Metadata
Show full item recordAbstract
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→KS0KL0) KK̄ 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 pKK̄ 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. © 2014 American Physical Society.
Date issued
2014Department
Massachusetts Institute of Technology. Department of PhysicsJournal
Physical Review C
Publisher
American Physical Society (APS)
Citation
Williams, Michael. 2014. "Data analysis techniques, differential cross sections, and spin density matrix elements for the reaction γ p → ϕ p." Physical Review C, 89 (5).
Version: Final published version