This paper presents the measurement of charged-hadron and identified-hadron (K0S, Lambda, Cascade-) yields in photonuclear collisions using 1.7nb-1 of sqrt(sNN) = 5.02TeV Pb+Pb 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 0.1nb-1 of sqrt(sNN)=5.02TeV p+Pb 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 dpmjet-iii generator and hydrodynamic calculations to test whether such photonuclear collisions may produce small droplets of quark-gluon plasma that flow collectively.
Charged-hadron and identified-hadron (KS0, Lambda, Cascade-) yield measurements in photo-nuclear Pb+Pb and p+Pb collisions at sqrt(sNN) = 5.02 TeV with ATLAS
G Chiodini;Francesco De Santis;E Gorini;S Grancagnolo;FG Gravili;A Palazzo;M Primavera;S Spagnolo;A Ventura;
2025-01-01
Abstract
This paper presents the measurement of charged-hadron and identified-hadron (K0S, Lambda, Cascade-) yields in photonuclear collisions using 1.7nb-1 of sqrt(sNN) = 5.02TeV Pb+Pb 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 0.1nb-1 of sqrt(sNN)=5.02TeV p+Pb 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 dpmjet-iii generator and hydrodynamic calculations to test whether such photonuclear collisions may produce small droplets of quark-gluon plasma that flow collectively.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
