Erlangen 2026 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 40: Heavy-Ion Collisions and QCD Phases VI
HK 40.2: Talk
Thursday, March 19, 2026, 16:30–16:45, PHIL C 601
Measurement of η mesons in pp collisions at √s = 13.6 TeV with ALICE at a magnetic field of B = 0.2 T — •Laura Gans-Bartl for the ALICE Germany collaboration — Institut für Kernphysik, Goethe Universität Frankfurt am Main
The ALICE experiment at CERN investigates the properties of the Quark Gluon Plasma (QGP). One key probe to study the QGP, dileptons, offers direct access to the medium’s temperature. At low transverse momentum (pT), the dilepton spectrum is dominated by η meson Dalitz decays, making an accurate description of the low-pT η yield essential for precise dilepton measurements.
The low-pT region is experimentally challenging for η reconstruction due to large combinatorial background and low reconstruction efficiency. In ALICE, the accessible pT range can be extended by reducing the magnetic field strength from B = 0.5 T to B = 0.2 T, which significantly improves the reconstruction of very low-pT tracks.
This talk addresses the ALICE Run 3 analysis of η meson production in pp collisions at B = 0.2 T, measured via the Dalitz decay channel. Photons are reconstructed using the Photon Conversion Method (PCM), while the electrons are reconstructed as primary tracks. The current status of the analysis will be presented.
Supported by BMFTR and the Helmholtz Association.
Keywords: ALICE; eta meson; pp collision; low B-field