Köln 2025 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 57: Heavy-Ion Collisions and QCD Phases IX
HK 57.1: Group Report
Thursday, March 13, 2025, 17:30–18:00, HS 3 Chemie
Measurement of radius dependent jet suppression and jet-hadron correlations in Pb–Pb collisions at 5.02 TeV with a novel mixed-event approach — •Nadine Alice Grünwald for the ALICE Germany collaboration — Heidelberg University, Heidelberg, Germany
The Quark-Gluon Plasma (QGP) is produced in heavy-ion collisions collisions where quarks and gluons are deconfined and new physics phenomena emerge. The ALICE experiment measures heavy-ion collisions at the LHC where the QGP can be studied using jets from partons, which are produced in the early stage of the collisions.
In this talk mixed events as a new approach to describe the uncorrelated background in jet measurements in heavy-ion collisions in ALICE are presented. The resulting charged-particle jet RAA measurements have high precision over a broad kinematic range, reaching significantly lower jet pT values as compared to the traditional analyses. Various jet resolution parameters are studied to measure the radius dependence of the jet energy loss and thereby the redistribution of the lost energy to the surrounding QGP medium.
We also present measurements of the event plane dependent jet-hadron correlations. Angular correlations of jets are analyzed to obtain information about the energy loss of jets in the medium. The study of these correlation functions for different orientations of the jet to the event plane allows for a measurement of the energy loss which is sensitive to the in-medium path-length of the parton.
Keywords: Heavy-ion; Jets; Mixed-events