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HK: Fachverband Physik der Hadronen und Kerne
HK 40: Heavy-Ion Collisions and QCD Phases VI
HK 40.6: Vortrag
Donnerstag, 19. März 2026, 17:30–17:45, PHIL C 601
Hadron-photon correlations in pp collisions in ALICE — •Julius Kinner for the ALICE Germany collaboration — Universität Münster
Ultrarelativistic proton and heavy-ion collisions are measured with ALICE at the LHC, allowing the study of quantum chromodynamics and the quark-gluon plasma. Two interesting observables are jets, collimated hadrons created by a hard scattering, and direct photons, created directly in the collision and not stemming from particle decays.
The production of direct photons and inclusive photons in jets, and their relations, can be studied via angular two-particle correlations using the Δϕ and Δη of trigger and associated particles. High-pT charged particles are used as triggers and proxies for jets, and electromagnetic probes as associated particles.
Correlation functions of associated γ and π0 are calculated with the photon conversion method and an invariant mass analysis of π0 → γγ, using ALICE data from pp collisions at √s = 13.6 TeV, which is a work in progress. This is done as the continuation of a phenomenological study with PYTHIA simulations, which was carried out in the context of a possible measurement of angular jet-direct-photon correlations with the subtraction method (subtracting the decay-photon contribution from inclusive photons) to study the electromagnetic structure of jets.
Supported by BMFTR
Keywords: ALICE; jet; photon; angular correlation