Erlangen 2026 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 27: Poster Session

HK 27.30: Poster

Wednesday, March 18, 2026, 16:15–18:30, Redoutensaal

Exploring the particle emission source in proton-proton collisions via collective expansion — •Sebastian Wind — Technical University of Munich

While the formation of Quark-Gluon Plasma (QGP) and associated collective behavior are well-established in heavy-ion collisions, their existence in proton-proton (pp) collisions remains unknown. Recent femtoscopic measurements have observed assumed signatures of collective behavior in pp collisions, challenging our understanding of small system collisions.

In this poster, we investigate the m_T-scaling behavior via collective expansion using the analytically solvable hydrodynamical Gubser solution. By comparing our predictions to ALICE collaboration data and contrasting them with free-streaming model calculations, we try to understand whether the observed m_T-scaling behavior can be related to the collective expansion. This work provides insights into potential QGP formation in small system collisions and the applicability of hydrodynamics in describing pp collisions.

Keywords: proton-proton collision; quark-gluon plasma; collectivity