Nucleon Resonance Electrocouplings from the CLAS Data on Exclusive Meson Electroproduction off Protons

TL;DR

This paper reports the first independent determinations of nucleon resonance electrocouplings from CLAS data, providing new insights into excited proton states through exclusive meson electroproduction analyses.

Contribution

It introduces a novel analysis of CLAS data to extract electrocouplings of high-lying N* states, especially those decaying to Nππ, expanding understanding of nucleon excitations.

Findings

First independent determination of nucleon resonance electrocouplings.

Extended information on high-lying N* states decaying to Nππ.

Enhanced understanding of nucleon excitation spectrum.

Abstract

$\gamma_{v}NN^*$ transition helicity amplitudes (electrocouplings) of several prominent excited proton states are determined for the first time in independent analyses of $\pi^+n$, $\pi^0p$, and $\pi^+\pi^-p$ electroproduction off protons. Analysis of $\pi^+\pi^-p$ electroproduction has extended considerably information on electrocouplings of high lying N* states, which decay preferentially to the $N\pi\pi$ final states.