Title

Measurements of the γvp→p′π+π- cross section with the CLAS detector for 0.4 GeV2

Authors

G. V. Fedotov, Ohio University
Iu A. Skorodumina, University of South Carolina
V. D. Burkert, Thomas Jefferson National Accelerator Facility
R. W. Gothe, University of South Carolina
K. Hicks, Ohio University
V. I. Mokeev, Lomonosov Moscow State University
S. Adhikari, Florida International University
Whitney R. Armstrong, Argonne National Laboratory
H. Avakian, Thomas Jefferson National Accelerator Facility
J. Ball, Institut de Recherche sur les Lois Fondamentales de l'Univers
I. Balossino, Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara
L. Barion, Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara
M. Bashkanov, The University of Edinburgh
M. Battaglieri, Istituto Nazionale di Fisica Nucleare, Sezione di Genova
V. Batourine, Thomas Jefferson National Accelerator Facility
I. Bedlinskiy, Alikhanov Institute for Theoretical and Experimental Physics
A. S. Biselli, Carnegie Mellon University
S. Boiarinov, Thomas Jefferson National Accelerator Facility
W. J. Briscoe, The George Washington University
W. K. Brooks, Thomas Jefferson National Accelerator Facility
D. S. Carman, Thomas Jefferson National Accelerator Facility
A. Celentano, Istituto Nazionale di Fisica Nucleare, Sezione di Genova
G. Charles, Old Dominion University
T. Chetry, Ohio University
G. Ciullo, University of Ferrara
Brandon A. Clary, University of Connecticut
P. L. Cole, Idaho State University
M. Contalbrigo, Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara
O. Cortes, Idaho State University
A. D'Angelo, Istituto Nazionale di Fisica Nucleare - INFN
N. Dashyan, Yerevan Physics Institute
G. Niculescu, Ohio University

Document Type

Article

Publication Date

8-21-2018

Abstract

© 2018 American Physical Society. New results on the single-differential and fully integrated cross sections for the process γvp→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 ∼1.8 GeV.

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