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Open Access Publications from the University of California

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

  • Author(s): 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
  • et al.

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.

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