Erlangen 2026 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 23: Heavy-Ion Collisions and QCD Phases III

HK 23.6: Talk

Wednesday, March 18, 2026, 15:15–15:30, PHIL C 301

J/ψ elliptical-flow v₂ analysis in O-O collisions at mid-rapidity using ALICE Run-3 data — •Ankur Yadav, Samrangy Sadhu, Lubna Al-Rifaie, and Bernhard Ketzer for the ALICE Germany collaboration — Helmholtz-Institut für Strahlen und Kernphysik, Universität Bonn

The Large Hadron Collider (LHC) at CERN had first oxygen-oxygen (O-O) collisions at √S_NN = 5.36 TeV in 2025. This dataset provides a unique opportunity to study collectivity and quark-gluon-plasma (QGP) signatures in a smaller collision system compared to the heavy-ion systems such as Pb-Pb. The ALICE experiment has recorded this dataset with excellent precision, enabling the investigation of quarkonium production with a focus on the J/ψ meson.

This talk will present the first measurement of the azimuthal-anisotropy coefficient v₂ of inclusive J/ψ in O-O collisions at mid-rapidity. The v₂ values are extracted in several transverse-momentum and centrality intervals using the scalar product method. Comparing this measurement to existing results from larger collision systems allows us to probe the scaling of quarkonium collectivity with system size.

The talk will cover the analysis procedure, including signal extraction, and flow determination, as well as the resulting J/ψ elliptic flow values.

Supported by BMFTR.

Keywords: Elliptical flow; Oxygen collisions; Jpsi