This paper reports new exclusive cross sections for e p --> e' pi+ pi- p' using the CLAS detector at Jefferson Laboratory. These results are presented for the first time at photon virtualities 2.0GeV^(2)<5.0GeV^(2) in the center-of-mass energy range 1.4 GeV < 2.0 GeV, which covers a large part of the nucleon resonance region. Using a model developed for the phenomenological analysis of electroproduction data, we see strong indications that the relative contributions from the resonant cross sections at W<1.74 GeV increase with Q^(2). These data considerably extend the kinematic reach of previous measurements. Exclusive e p --> e' pi+ pi- p' cross section measurements are of particular importance for the extraction of resonance electrocouplings in the mass range above 1.6 GeV.
Measurements of ep --> e' pi+ pi- p' cross sections with CLAS at 1.40 GeV<2.0 GeV and 2.0 GeV^(2) < Q^(2) < 5.0 GeV^(2)
Ciullo, G.;Contalbrigo, M.;Lenisa, P.;Movsisyan, A.;
2017
Abstract
This paper reports new exclusive cross sections for e p --> e' pi+ pi- p' using the CLAS detector at Jefferson Laboratory. These results are presented for the first time at photon virtualities 2.0GeV^(2)<5.0GeV^(2) in the center-of-mass energy range 1.4 GeV < 2.0 GeV, which covers a large part of the nucleon resonance region. Using a model developed for the phenomenological analysis of electroproduction data, we see strong indications that the relative contributions from the resonant cross sections at W<1.74 GeV increase with Q^(2). These data considerably extend the kinematic reach of previous measurements. Exclusive e p --> e' pi+ pi- p' cross section measurements are of particular importance for the extraction of resonance electrocouplings in the mass range above 1.6 GeV.File | Dimensione | Formato | |
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2017_PRC96_measurements_ep_to_epi_pi_p_ciullo.pdf
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