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HK: Fachverband Physik der Hadronen und Kerne
HK 9: Heavy-Ion Collisions and QCD Phases II
HK 9.3: Vortrag
Montag, 11. März 2024, 17:30–17:45, HBR 62: EG 05
Soft ω meson production in pp collisions at √s = 5.02 TeV with ALICE — •Merle Luisa Wälde for the ALICE Germany collaboration — Institut für Kernphysik, Goethe Universität Frankfurt
Measurements of hadron production cross sections in proton-proton (pp) collisions at high energies are important to test our understanding of QCD and as a reference for heavy-ion studies. While the production of particles in hard scatterings can be calculated in a perturbative approach, the production via soft processes relies on phenomenological model approaches that require experimental input and suffer from sizeable uncertainties in their predictions. Therefore, the production cross section of the ω meson needs to be measured down to the lowest transverse momentum (pT) where the reach to low momenta is scarce at LHC energies and midrapidity.
In this talk, the first measurement of the ω meson down to pT = 0 in pp collisions at √s = 5.02 TeV at midrapidity will be presented. This measurement is performed in the decay channel ω → e+e− with ALICE. We will discuss the estimation of the different background sources as well as uncertainties related to the signal extraction, and track and PID requirements. The final results will be compared to model calculations focusing on particle production in the soft-pT regime.