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HK: Fachverband Physik der Hadronen und Kerne
HK 23: Poster
HK 23.20: Poster
Dienstag, 11. März 2025, 17:30–19:00, Foyer Physik
Direct-Photon-Jet Correlations in Pythia Simulations for ALICE — •Julius Kinner — Universität Münster, Germany
Ultrarelativistic collisions of protons and heavy ions are measured with ALICE, which for instance allows the study of quantum chromodynamics and the quark-gluon plasma (QGP). Two interesting observables are jets, collimated hadrons created from the outgoing partons of a hard scattering, and direct photons, which do not stem from particle decays and transverse the QGP unchanged after their production, not interacting via the strong force.
Correlations between jets and photons can be studied with two-particle correlations by collecting the difference Δϕ and Δη between trigger and associated particles in a correlation function. Hard-charged triggers can be used as a proxy for jets and photons can be used as associated particles. This is done as a phenomenological study with Pythia simulations for pp collisions at √s = 13 TeV, focusing on photons of different origins. Namely, the decays of π0, η, and ω into photons are considered, and correlation functions of these associated hadrons are converted to those of their decay photons. All this is done in the context of a possible measurement of direct photons with a subtraction method. Furthermore, a comparison between two parton-shower models in Pythia (Simple and Vincia) is made. The current state of the analysis using experimental data from ALICE will also be shown.
Keywords: jet; direct photon; two-particle correlation