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Photoproduction cross sections are reported for the reaction pp using energy-tagged photons and the CLAS spectrometer at Jefferson Laboratory. The ? mesons are detected in their dominant charged decay mode, p+p-p0, and results on differential cross sections are presented for incident photon energies between 1.2 and 4.7 GeV. These new ? photoproduction data are consistent with earlier CLAS results but extend the energy range beyond the nucleon resonance region into the Regge regime. The normalized angular distributions are also compared with the experimental results from several other experiments, and with predictions of ?-MAID 2018 and the latest solution of the Bonn-Gatchina coupled-channel analysis. Differential cross sections ds/dt are presented for incident photon energies E?>2.9GeV (W>2.5GeV), and compared with predictions which are based on Regge trajectories exchange in the t-channel (Regge models). The data confirm the expected dominance of vector-meson exchange in an analysis by the Joint Physics Analysis Center.
Bibliographical noteFunding Information:
The authors thank the technical staff at Jefferson Laboratory and at all the participating institutions for their invaluable contributions to the success of the experiment. This research is based on work supported by the US Department of Energy, Office of Science, Office of Nuclear Physics, under Contract No. DE-AC05-06OR23177. The group at Florida State University acknowledges additional support from the US Department of Energy, Office of Science, Office of Nuclear Physics, under Contract No. DE-FG02-92ER40735. This work was also supported by the US National Science Foundation, the State Committee of Science of Republic of Armenia, the Chilean Comisión Nacional de Investigación Científica y Tecnológica (CONICYT), the Italian Istituto Nazionale di Fisica Nucleare, the French Centre National de la Recherche Scientifique, the French Commissariat a l'Energie Atomique, the Scottish Universities Physics Alliance (SUPA), the United Kingdom's Science and Technology Facilities Council, and the National Research Foundation of Korea.
© 2020 American Physical Society.
Copyright 2020 Elsevier B.V., All rights reserved.
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1/10/21 → 30/09/24
Project: Research project (funded) › Research