Model analysis of theep→e'pπ+π−electroproduction reaction on the proton

Abstract

Recent CLAS data on the pπ + π − electroproduction off protons at 1.3<W<1.57 GeV and 0.25<Q 2 <0.6 GeV 2 have been analyzed using a meson-baryon phenomenological model. By fitting nine 1-fold differential cross section data for each W and Q 2 bin, the charged double pion electroproduction mechanisms are identified from their manifestations in the observables. We have extracted the cross sections from amplitudes of each of the considered isobar channels as well as from their coherent sum. We also obtained non-resonant partial wave amplitudes of all contributing isobar channels which could be useful for advancing a complete coupled-channel analysis of all meson electroproduction data.

Measurements of the γvp→p′π+π− cross section with the CLAS detector for 0.4Fedotov1, Skorodumina2, Burkert3 et al. 2018Phys. Rev. CSelf Cite170120View full textAdd to dashboardCite

“…20 as a function of Q 2 for various ranges in W .I t was obtained as the ratio of the evaluated resonant part to the TWOPEG estimation for the full cross section. Figure 20 demonstrates the growth of the relative resonant contribution with increasing W , consistent with previous studies [11,12]. For small W ∼ 1.45 GeV, this contribution stays on a level of 20%, while at higher W ∼ 1.75 GeV it reaches 70%.…”

“…[8] ("e1c") it is shown by the bands. [11][12][13]. This analysis will eventually allow a determination of the Q 2 evolution of the electrocouplings of most nucleon resonances with masses up to ∼1.8 GeV for photon virtualities Q 2 from 0.425 to 0.975 GeV 2 .…”

“…This model aims at extracting the resonance electrocouplings as well as establishing the contributions from different reaction subchannels and has proven itself as an effective tool for the analysis of the experimental cross sections [11][12][13].…”

Experimental study of theP11(1440)andD13(1520)Mokeev1, Burkert2, Elouadrhiri3 et al. 2012Phys. Rev. CSelf Cite13231680View full textAdd to dashboardCite

“…The data of [6] were collected in the mass range 1.31 GeV < W < 1.56 GeV and with photon virtualities 0.25 GeV 2 < Q 2 < 0.6 GeV 2 . A good description of these data was achieved within the framework of a phenomenological Jefferson Laboratory -Moscow State University (JM) reaction model [7], that allowed us to establish the mechanisms contributing to this exclusive reaction. The presence and strength of the contributing π + π − p electroproduction mechanisms were established by studying their kinematical dependencies and correlations in different one-fold differential cross sections.…”

“…The analysis was carried out employing the JM reaction model [7], which was further developed to provide a framework for the determination of γ v pN * electrocouplings from a combined fit of unpolarized differential cross sections. In the previous studies [7] we did not attempt to isolate the contributions from resonances. In the analysis reported in this paper, we employ the JM model with the goal of isolating the resonant contributions for the individual differential cross sections.…”