Publication
Charged-hadron and identified-hadron (KS0, Λ, Ξ-) yield measurements in photonuclear Pb plus Pb and p plus Pb collisions at √sNN=5.02 TeV with ATLAS
| Summary: | This paper presents the measurement of charged-hadron and identified-hadron (\( K_S^0 \), \( \Lambda \), \( \Xi^- \)) yields in photonuclear collisions using \( 1.7 \text{nb}^{-1} \) of \( \sqrt{s_{NN}} = 5.02 \text{TeV} \) 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 \( 0.1 \text{nb}^{-1} \) of \( \sqrt{s_{NN}} = 5.02 \text{TeV} \) \( p+\text{Pb} \) 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. |
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| Main Authors: | Castro, Nuno Filipe |
| Other Authors: | Onofre, A.; ATLAS Collaboration |
| Subject: | Ciências Naturais::Ciências Físicas |
| Year: | 2025 |
| Country: | Portugal |
| Document type: | article |
| Access type: | open access |
| Associated institution: | Universidade do Minho |
| Language: | English |
| Origin: | RepositóriUM - Universidade do Minho |
| Summary: | This paper presents the measurement of charged-hadron and identified-hadron (\( K_S^0 \), \( \Lambda \), \( \Xi^- \)) yields in photonuclear collisions using \( 1.7 \text{nb}^{-1} \) of \( \sqrt{s_{NN}} = 5.02 \text{TeV} \) 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 \( 0.1 \text{nb}^{-1} \) of \( \sqrt{s_{NN}} = 5.02 \text{TeV} \) \( p+\text{Pb} \) 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. |
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