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Charged-hadron and identified-hadron (KS0, Λ, Ξ−) yield measurements in photonuclear Pb+Pb and p+Pb collisions at sNN=5.02TeV with ATLAS

et al.
Creative Commons 'BY-NC' version 4.0 license
Abstract

This paper presents the measurement of charged-hadron and identified-hadron ( ) yields in photonuclear collisions using of data collected in 2018 with the ATLAS detector at the Large Hadron Collider. Candidate photonuclear events are selected using a combination of tracking and calorimeter information, including the zero-degree calorimeter. The yields as a function of transverse momentum and rapidity are measured in these photonuclear collisions as a function of charged-particle multiplicity. These photonuclear results are compared with of data collected in 2016 by ATLAS using similar charged-particle multiplicity selections. These photonuclear measurements shed light on potential quark-gluon plasma formation in photonuclear collisions via observables sensitive to radial flow, enhanced baryon-to-meson ratios, and strangeness enhancement. The results are also compared with the Monte Carlo generator and hydrodynamic calculations to test whether such photonuclear collisions may produce small droplets of quark-gluon plasma that flow collectively.

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