Exclusive π0p electroproduction off protons in the resonance region at photon virtualities 0.4GeV2≤Q2≤1GeV2

Le résumé fourni par la source

The exclusive electroproduction process $ep\ensuremath{\rightarrow}{e}^{\ensuremath{'}}{p}^{\ensuremath{'}}{\ensuremath{\pi}}^{0}$ was measured in the range of photon virtualities ${Q}^{2}=0.4--1.0\phantom{\rule{4pt}{0ex}}{\mathrm{GeV}}^{2}$ and the invariant mass range of the $p{\ensuremath{\pi}}^{0}$ system of $W=1.1--1.8$ GeV. These kinematics are covered in exclusive ${\ensuremath{\pi}}^{0}$ electroproduction off the proton with nearly complete angular coverage in the $p{\ensuremath{\pi}}^{0}$ center-of-mass system and with high statistical accuracy. Nearly 36 000 cross-section points were measured, and the structure functions ${\ensuremath{\sigma}}_{T}+\ensuremath{\epsilon}{\ensuremath{\sigma}}_{L},{\ensuremath{\sigma}}_{LT}$, and ${\ensuremath{\sigma}}_{TT}$, were extracted via fitting the ${\ensuremath{\phi}}_{{\ensuremath{\pi}}^{0}}$ dependence of the cross section. A Legendre polynomial expansion analysis demonstrates the sensitivity of our data to high-lying ${N}^{*}$ and ${\mathrm{\ensuremath{\Delta}}}^{*}$ resonances with $M>1.6$ GeV. As part of a broad effort to determine the electrocouplings of the ${N}^{*}$ and ${\mathrm{\ensuremath{\Delta}}}^{*}$ resonances using both single- and double-pion electroproduction, this dataset is crucial for the reliable extraction of the high-lying resonance electrocouplings from the combined isospin analysis of the $N\ensuremath{\pi}$ and ${\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}p$ channels.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.