This paper reports the measurement of polarized and unpolarized cross sections for the ep → e′ p′ γ reaction, which is composed of deeply virtual Compton scattering (DVCS) and Bethe-Heitler (BH) processes, at an electron beam energy of 5.88 GeV at the Thomas Jefferson National Accelerator Facility using the Large Acceptance Spectrometer CLAS. The unpolarized cross sections and polarized cross section differences have been measured over broad kinematics, 0.10 < xB < 0.58, 1.0 < Q2 < 4.8GeV2, and 0.09 < −t < 2.00GeV2. The results are found to be consistent with previous CLAS data, and these new data are discussed in the framework of the generalized parton distribution approach. Calculations with two widely used phenomenological models are approximately compatible with the experimental results over a large portion of the kinematic range of the data.
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Funded by SCOAP3.
This work was supported in part by 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 (CNRS), the French Commissariat à l'Energie Atomique (CEA), Partner University Fund (PUF) of the French-American Cultural Exchange (FACE), the US National Science Foundation, the Scottish Universities Physics Alliance (SUPA), the United Kingdom's Science and Technology Facilities Council (STFC), and the National Research Foundation of Korea (NRF). This material is based upon work supported by the US Department of Energy, Office of Science, Office of Nuclear Physics under Contract No. DE-AC05-06OR23177. The Southeastern Universities Research Association (SURA) operates the Thomas Jefferson National Accelerator Facility for the US Department of Energy under Contract No. DE-AC05-84ER40150.
See Supplemental Material at http://link.aps.org/supplemental/10.1103/PhysRevC.98.045203 for a table of cross sections and asymmetries for all kinematic intervals obtained in this experiment.
Saylor, N. Hirlinger; Guegan, B.; Burkert, V. D.; Elouadrhiri, L.; Garçon, M.; Girod, F. X.; Guidal, M.; Jo, H. S.; Kubarovsky, V.; Niccolai, S.; Stoler, P.; Adhikari, K. P.; Adhikari, S.; Akbar, Z.; Amaryan, M. J.; Anefalos Pereira, S.; Ball, J.; Balossino, I.; Baltzell, N. A.; Barion, L.; Battaglieri, M.; Batourine, V.; Bedlinskiy, I.; Biselli, A. S.; Boiarinov, S.; Briscoe, W. J.; Brooks, W. K.; Bültmann, S.; Cao, F.; Carman, S.; and Gohn, Wesley P., "Measurement of Unpolarized and Polarized Cross Sections for Deeply Virtual Compton Scattering on the Proton at Jefferson Laboratory with CLAS" (2018). Physics and Astronomy Faculty Publications. 625.