학술논문
Exclusive π+ electroproduction off the proton from low to high −t
Document Type
article
Author
Basnet, S; Huber, GM; Li, WB; Blok, HP; Gaskell, D; Horn, T; Aniol, K; Arrington, J; Beise, EJ; Boeglin, W; Brash, EJ; Breuer, H; Chang, CC; Christy, ME; Ent, R; Gibson, E; Holt, RJ; Jin, S; Jones, MK; Keppel, CE; Kim, W; King, PM; Kovaltchouk, V; Liu, J; Lolos, GJ; Mack, DJ; Margaziotis, DJ; Markowitz, P; Matsumura, A; Meekins, D; Miyoshi, T; Mkrtchyan, H; Niculescu, I; Okayasu, Y; Pentchev, L; Perdrisat, C; Potterveld, D; Punjabi, V; Reimer, P; Reinhold, J; Roche, J; Sarty, A; Smith, GR; Tadevosyan, V; Tang, LG; Tvaskis, V; Volmer, J; Vulcan, W; Warren, G; Wood, SA; Xu, C; Zheng, X
Source
Physical Review C. 100(6)
Subject
Language
Abstract
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.