Exclusive electroproduction off the proton from low to high
Background: Measurements of exclusive meson production are a valuable tool in the study of hadronic structure. Specifically, one can discern the relevant degrees of freedom at different distance scales through these studies. Purpose: To study the transition between non-perturbative and perturbative Quantum Chromodyanmics as the square of four momentum transfer to the struck proton, –t, is increased. Method: Cross sections for the 1H(e,e'π+)n reaction were measured over the –t range of 0.272 to 2.127 GeV2with 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 (GPD) based model. Conclusion: The agreement of cross sections with prior data suggests 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.
- Research Organization:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Argonne National Lab. (ANL), Argonne, IL (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- Natural Sciences and Engineering Research Council of Canada (NSERC); USDOE Office of Science (SC), Nuclear Physics (NP); USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
- Contributing Organization:
- Jefferson Lab F(pi)-2 Collaboration
- Grant/Contract Number:
- SAPIN-2016-00031; AC02-05CH11231; AC02-06CH11357
- OSTI ID:
- 1582308
- Alternate ID(s):
- OSTI ID: 1593119; OSTI ID: 1830334
- Report Number(s):
- JLAB-PHY-19-3125; DOE/OR/23177-4890; arXiv:1911.11681; PRVCAN; TRN: US2102094
- Journal Information:
- Physical Review C, Vol. 100, Issue 6; ISSN 2469-9985
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Similar Records
Target and beam-target spin asymmetries in exclusive pion electroproduction for . I.
Rosenbluth Separation of the Electroproduction Cross Section