Measurement of inclusive jet spectra in pp, p-Pb, and Pb-Pb collisions with the ALICE detector

TL;DR

This paper reports on measurements of inclusive jet spectra in proton-proton, proton-lead, and lead-lead collisions using the ALICE detector, providing insights into hot and cold nuclear matter effects and jet structure modifications.

Contribution

It presents new measurements of jet spectra and nuclear modification factors across different collision systems and energies, with specialized background subtraction techniques for each system.

Findings

Jet spectra differ between collision systems, indicating medium effects.

Nuclear modification factors reveal suppression or enhancement patterns.

Radial jet structure varies with collision environment.

Abstract

Highly energetic jets are sensitive probes for the kinematic properties and the topology of high energy hadron collisions. Jets are collimated sprays of charged and neutral particles, which are produced in fragmentation of hard scattered partons from an early stage of the collision. In ALICE, jets have been measured in pp, p-Pb, and Pb-Pb collisions at several collision energies. While analyses of Pb-Pb events unveil properties of the hot and dense medium formed in heavy-ion collisions, pp and p-Pb collisions can shed light on hadronization and cold nuclear matter effects in jet production. Additionally, pp and p-Pb serve as a baseline for disentangling hot and cold nuclear matter effects. A possible modification of the initial state is tested in p-Pb analyses. For the extraction of a jet signal, the exact evaluation of the background from the underlying event is an especially important ingredient. Due to the different nature of underlying events, each collision system requires a different analysis technique for removing the effect of the background on the jet sample. The focus of this publication is on the ALICE measurements of nuclear modification factors connecting p-Pb and Pb-Pb events to pp collisions. Furthermore, the radial jet structure is explored by comparing jet spectra reconstructed with different resolution parameters.