Transition nucleon resonance electrocouplings from CLAS data on $\pi^{+}\pi^{-}p$ electroproduction off protons

TL;DR

This paper reports the first extraction of nucleon resonance electrocouplings from CLAS data on $^+^-p$ electroproduction, providing new insights into excited proton states below 1.8 GeV at low photon virtualities.

Contribution

It introduces a novel analysis of CLAS data to determine nucleon resonance electrocouplings for the first time in this energy and virtuality range.

Findings

Electrocouplings of excited proton states below 1.8 GeV were successfully extracted.

The analysis utilized a combined fit of all available observables within a phenomenological model.

Results provide new constraints on nucleon resonance structure at low $Q^2$.

Abstract

Electrocouplings of excited proton states with masses less than 1.8 GeV were determined for the first time from the CLAS data on $\pi^+\pi^-p$ electroproduction at photon virtualities $Q^2$ $<$ 1.5 GeV$^2$. Electrocouplings were obtained from a combined fit of all available observables within the framework of a phenomenological reaction model.