Exclusive $\pi^+$ electroproduction off the proton from low to high -t
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 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 H(e,e')n reaction were measured over the -t range of 0.272 to 2.127 GeV with limited azimuthal coverage at fixed beam energy of 4.709 GeV, Q of 2.4 GeV and W of 2.0 GeV at the Thomas Jefferson National Accelerator Facility (JLab) Hall C. Results: The -t dependence of the measured 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 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.
Keywords
Cite
@article{arxiv.1911.11681,
title = {Exclusive $\pi^+$ electroproduction off the proton from low to high -t},
author = {S. Basnet and G. M. Huber and W. B. Li and H. P. Blok and D. Gaskell and T. Horn and K. Aniol and J. Arrington and E. J. Beise and W. Boeglin and E. J. Brash and H. Breuer and C. C. Chang and M. E. Christy and R. Ent and E. Gibson and R. J. Holt and S. Jin and M. K. Jones and C. E. Keppel and W. Kim and P. M. King and V. Kovaltchouk and J. Liu and G. J. Lolos and D. J. Mack and D. J. Margaziotis and P. Markowitz and A. Matsumura and D. Meekins and T. Miyoshi and H. Mkrtchyan and I. Niculescu and Y. Okayasu and L. Pentchev and C. Perdrisat and D. Potterveld and V. Punjabi and P. Reimer and J. Reinhold and J. Roche and A. Sarty and G. R. Smith and V. Tadevosyan and L. G. Tang and V. Tvaskis and J. Volmer and W. Vulcan and G. Warren and S. A. Wood and C. Xu and X. Zheng},
journal= {arXiv preprint arXiv:1911.11681},
year = {2020}
}
Comments
9 pages, 5 figures Physical Review C, in press