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Abstract <p>The primary purpose of the ALICE experiment at the Large Hadron Collider is to study the properties of nuclear matter at extremely high temperatures and energy density produced by relativistic nucleus–nucleus collisions. During the Long Shutdown 2 (2019–2022), new detectors were incorporated into the ALICE setup, including the Fast Interaction Trigger (FIT). The FIT detector system consists of three sub-detectors based on different technologies: FDD, FT0 and FV0. In addition to online functionality, the FIT data are used offline for multiplicity, centrality, collision time, event-plane determination, vertex position, and veto for selection of diffractive and ultra-peripheral heavy-ion collisions. The mentioned above global observables are essential for event characterization and the study of nuclear matter properties. This material presents a preliminary overview of FIT’s performance in the extraction of global observables from <i>pp</i> and Pb–Pb collisions during the LHC Run 3.</p>

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Performance of the Fast Interaction Trigger (FIT) Detector System for Global Observables at ALICE in RUN 3

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • A. Furs,
  • M. Sukhanov,
  • D. Finogeev,
  • T. Karavicheva,
  • D. Serebryakov,
  • N. Vozniuk

摘要

Abstract

The primary purpose of the ALICE experiment at the Large Hadron Collider is to study the properties of nuclear matter at extremely high temperatures and energy density produced by relativistic nucleus–nucleus collisions. During the Long Shutdown 2 (2019–2022), new detectors were incorporated into the ALICE setup, including the Fast Interaction Trigger (FIT). The FIT detector system consists of three sub-detectors based on different technologies: FDD, FT0 and FV0. In addition to online functionality, the FIT data are used offline for multiplicity, centrality, collision time, event-plane determination, vertex position, and veto for selection of diffractive and ultra-peripheral heavy-ion collisions. The mentioned above global observables are essential for event characterization and the study of nuclear matter properties. This material presents a preliminary overview of FIT’s performance in the extraction of global observables from pp and Pb–Pb collisions during the LHC Run 3.