Analysis of CLAS data on double charged-pion electroproduction

Abstract

Abstract. Recent developments in phenomenological analysis of the CLAS data on 2π electroproduction are presented. The contributions from isobar channels and P11(1440), D13(1520) electrocouplings at Q 2 from 0.25 to 0.6 GeV 2 were determined from the analysis of comprehensive data on differential and fully integrated 2π cross sections.

A proposed U.S./China theoretical/experimental collaborative effort on baryon resonance extraction

“…JLab has access to N* form factors at Q 2 of up to 4 GeV 2 for single-pion production and 1.0 GeV 2 for the double-pion channel. Baryon transition form factors in the single-pion [21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36] and double-pion [37][38][39][40] decay channel have been investigated in Hall B at JLab using the CEBAF Large Acceptance Spectrometer (CLAS). And these data demonstrate that the separation of resonance and background contributions and therefore the extraction of the electrocoupling amplitudes [35,[41][42][43][44] of resonances become cleaner at higher four-momentum transfers (Q 2 ).…”

“…Baryon transition form factors in the single-pion [21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36] and double-pion [37][38][39][40] decay channel have been investigated in Hall B at JLab using the CEBAF Large Acceptance Spectrometer (CLAS). And these data demonstrate that the separation of resonance and background contributions and therefore the extraction of the electrocoupling amplitudes [35,[41][42][43][44] of resonances become cleaner at higher four-momentum transfers (Q 2 ). There is a further advantage of extracting resonances at higher Q 2 ; it is easier to isolate N*s than at the real photon point.…”