Köln 2025 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 9: Heavy-Ion Collisions and QCD Phases II

HK 9.4: Talk

Monday, March 10, 2025, 17:30–17:45, HS 3 Chemie

Differential measurement of the common particle emitting source using p–p correlations in pp collisions at 13.6 TeV with ALICE — •Anton Riedel for the ALICE Germany collaboration — Technische Unversität München, München, Deutschland

The minimum bias (MB) dataset of pp collisions at √s=13.6 TeV collected by ALICE during Run 3 of the LHC enables the first study of transverse mass (m_T) scaling of the femtoscopic source across event multiplicities. Previously observed in high-multiplicity pp collisions, the m_T dependence of the source size, linked to collective phenomena, is now extended to the low-multiplicity regime. The resonance source model, which accounts for the effects of strong-decaying resonances, allows comparison of source size dependence on multiplicity in pp collisions with results from larger systems, like Pb–Pb collisions. These results provide a new framework for exploring radial flow effects on source scaling and offer a benchmark for theoretical models on collective phenomena in small colliding systems. They are also essential for coalescence models addressing nuclear cluster production and serve as a crucial reference by fixing the emission source for high-precision studies of interaction potentials in hadron-hadron pairs with strangeness and charm using ALICE Run 3 data. This contribution presents the measurement of m_T scaling of the femtoscopic source of proton-proton pairs as a function of event multiplicity using ALICE Run 3 data. This project is funded by DFG (EXC2094 - 390783311) and BMBF Verbundforschung (05P21WOCA1 ALICE).

Keywords: ALICE; LHC Run 3; femtoscopy