Measurements of the Gamma(Upsilon)p -> p ’pi(+)Pi(- )Cross Section with the CLAS Detector for 0.4 GeV2 < Q(2) < 1.0 GeV2 and 1.3 GeV < W < 1.825 GeV

Authors

G. Fedotov
Iu A. Skorodumina
V. D. Burkert
R. W. Gothe
K. Hicks
V. Mokeev
S. Adhikari
Gerard P. Gilfoyle, University of RichmondFollow
et. al.

DOI

10.1103/PhysRevC.98.025203

Abstract

New results on the single-differential and fully integrated cross sections for the process γ_vp -> p'π⁺π^- are presented. The experimental data were collected with the CLAS detector at Jefferson Laboratory. Measurements were carried out in the kinematic region of the reaction invariant mass W from 1.3 to 1.825 GeV and the photon virtuality Q² from 0.4 to 1.0 GeV². The cross sections were obtained in narrow Q² bins (0.05 GeV²) with the smallest statistical uncertainties achieved in double-pion electroproduction experiments to date. The results were found to be in agreement with previously available data where they overlap. A preliminary interpretation of the extracted cross sections, which was based on a phenomenological meson-baryon reaction model, revealed substantial relative contributions from nucleon resonances. The data offer promising prospects to improve knowledge on the Q² evolution of the electrocouplings of most resonances with masses up to similar to ~ 1.8 GeV.

Document Type

Article

Publication Date

8-21-2018

Publisher Statement

Copyright © 2018 American Physical Society. This article first appeared in Physical Review C 98, no. 2 (August 21, 2018): 025203: 1-19. doi: 10.1103/PhysRevC.98.025203.

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Recommended Citation

Fedotov, G., Iu A. Skorodumina, V. D. Burkert, R. W. Gothe, K. Hicks, V. Mokeev, S. Adhikari, G. Gilfoyle, et al. “Measurements of the Gamma(Upsilon)p -> p ’pi(+)Pi(- )Cross Section with the CLAS Detector for 0.4 GeV2 < Q(2) < 1.0 GeV2 and 1.3 GeV < W < 1.825 GeV.” Physical Review C 98, no. 2 (August 21, 2018): 025203. https://doi.org/10.1103/PhysRevC.98.025203.