Exclusive π+ electroproduction off the proton from low to high -t

Jefferson Lab Fπ -2 Collaboration

Research output: Contribution to JournalArticleAcademicpeer-review


Background: Measurements of exclusive meson production are a useful tool in the study of hadronic structure. In particular, one can discern the relevant degrees of freedom at different distance scales through these studies. Purpose: To study the transition between nonperturbative and perturbative quantum chromodynamics as the square of four-momentum transfer to the struck proton, -t, is increased. Method: Cross sections for the H1(e,e′π+)n reaction were measured over the -t range of 0.272 to 2.127 GeV2 with limited azimuthal coverage at fixed beam energy of 4.709 GeV, Q2 of 2.4 GeV2, and W of 2.0 GeV at the Thomas Jefferson National Accelerator Facility (JLab) Hall C. Results: The -t dependence of the measured π+ electroproduction cross section generally agrees with prior data from JLab Halls B and C. The data are consistent with a Regge amplitude-based theoretical model but show poor agreement with a generalized parton distribution-based model. Conclusion: The agreement of cross sections with prior data implies small contribution from the interference terms, and the confirmation of the change in t slopes between the low- and high - t regions previously observed in photoproduction indicates the changing nature of the electroproduction reaction in our kinematic regime.

Original languageEnglish
Article number065204
JournalPhysical Review C
Issue number6
Publication statusPublished - 11 Dec 2019


This work was supported by the Natural Sciences and Engineering Research Council of Canada (NSERC), Grant No. SAPIN-2016-00031 and in part by the US Department of Energy. We acknowledge additional research grants from the US National Science Foundation, NATO, and FOM (Netherlands). We thank Dr. K. Park for sharing his results from JLab Hall B and Dr. C. Weiss for stimulating discussions on the topic. We also thank Dr. T. K. Choi, Dr. K. J. Kong, and Dr. B. G Yu for their Regge amplitude-based CKY model, as well as Dr. S. V. Goloskokov and Dr. P. Kroll of the GPD-based GK model for sharing their model calculations and many informative discussions.

FundersFunder number
US Department of Energy
US National Science Foundation
National Science Foundation1913257, 1714133
U.S. Department of Energy
North Atlantic Treaty Organization
Natural Sciences and Engineering Research Council of CanadaSAPIN-2016-00031
Stichting voor Fundamenteel Onderzoek der Materie
Foundation for Fundamental Research on Matter


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