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 9.3: Talk
Monday, March 10, 2025, 17:15–17:30, HS 3 Chemie
Uniform description of multiplicity dependent particle pT spectra with ALICE — •Joshua König — Institut für Kernphysik, Goethe-Universität Frankfurt
Identified particle transverse momentum (pT) spectra in ultra-relativistic pp collisions are crucial for constraining fragmentation functions and parton distribution functions, thereby offering deeper insight into the particle production mechanisms in these collisions.
Universal scaling laws are often employed to identify commonalities in particle production mechanisms across different collision energies and across different charged particle multiplicities. Transverse Bjorken-x (xT) scaling is used to showcase a uniform behavior for particle pT spectra across different center-of-mass energies, while KNO scaling provides a framework to describe these spectra uniformly across varying charged-particle multiplicity classes.
Recent results from the ALICE collaboration present data for various identified particles at LHC energies and across different charged-particle multiplicity classes, offering an opportunity to study these scaling laws in great detail.
In this talk, the multiplicity dependence of identified particle pT spectra is investigated by means of xT and KNO scaling. A surprising similarity between the multiplicity dependence and the center of mass energy dependence is shown. Furthermore, these findings are applied to results from MC generators to gain insight into the initial state of the collision.
Supported by BMBF and the Helmholtz Association
Keywords: Multiplicity; pp; spectra; scaling; LHC