Properties of hadronic final states in diffractive deep inelasticepscattering at DESY HERA

Le résumé fourni par la source

Characteristics of the hadronic final state of diffractive deep inelastic scattering events $e\stackrel{\ensuremath{\rightarrow}}{p}\mathrm{eXp}$ were studied in the kinematic range $4<{M}_{X}<35\mathrm{GeV},$ $4<{Q}^{2}<150{\mathrm{GeV}}^{2},$ $70<W<250\mathrm{GeV},$ and $0.0003<{x}_{P}<0.03$ with the ZEUS detector at the DESY ep collider HERA using an integrated luminosity of 13.8 ${\mathrm{pb}}^{\mathrm{\ensuremath{-}}1}$. The events were tagged by identifying the diffractively scattered proton using the leading proton spectrometer. The properties of the hadronic final state X were studied in its center-of-mass frame using thrust, thrust angle, sphericity, energy flow, transverse energy flow, and ``seagull'' distributions. As the invariant mass of the system increases, the final state becomes more collimated, more aligned, and more asymmetric in the average transverse momentum with respect to the direction of the virtual photon. Comparisons of the properties of the hadronic final state with predictions from various Monte Carlo model generators suggest that the final state is dominated by $q\overline{q}g$ states at the parton level.

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