In EDS ansehen

System size and energy dependence of the mean transverse momentum fluctuations at the LHC.

Gespeichert in:
Bibliographische Detailangaben
Titel: System size and energy dependence of the mean transverse momentum fluctuations at the LHC.
Autoren: ALICE Collaboration, Acharya, S., Agarwal, A., Aglieri Rinella, G., Aglietta, L., Agnello, M., Agrawal, N., Ahammed, Z., Ahmad, S., Ahn, S. U., Ahuja, I., Akindinov, A., Akishina, V., Al-Turany, M., Aleksandrov, D., Alessandro, B., Alfanda, H. M., Alfaro Molina, R., Ali, B., Alici, A.
Quelle: European Physical Journal C -- Particles & Fields; Jul2025, Vol. 85 Issue 7, p1-22, 22p
Schlagwörter: LARGE Hadron Collider, HEAVY ion collisions, COLLISIONS (Nuclear physics), PARTICLES (Nuclear physics), PROTON-proton interactions, STATISTICAL correlation, FLUCTUATIONS (Physics)
Abstract: Event-by-event fluctuations of the event-wise mean transverse momentum, ⟨ p T ⟩ , of charged particles produced in proton–proton (pp) collisions at s = 5.02 TeV, Xe–Xe collisions at s NN = 5.44 TeV, and Pb–Pb collisions at s NN = 5.02 TeV are studied using the ALICE detector based on the integral correlator ⟨ ⟨ Δ p T Δ p T ⟩ ⟩ . The correlator strength is found to decrease monotonically with increasing produced charged-particle multiplicity measured at midrapidity in all three systems. In Xe–Xe and Pb–Pb collisions, the multiplicity dependence of the correlator deviates significantly from a simple power-law scaling as well as from the predictions of the HIJING and AMPT models. The observed deviation from power-law scaling is expected from transverse radial flow in semicentral to central Xe–Xe and Pb–Pb collisions. In pp collisions, the correlation strength is also studied by classifying the events based on the transverse spherocity, S 0 , of the particle production at midrapidity, used as a proxy for the presence of a pronounced back-to-back jet topology. Low-spherocity (jetty) events feature a larger correlation strength than those with high spherocity (isotropic). The strength and multiplicity dependence of jetty and isotropic events are well reproduced by calculations with the PYTHIA 8 and EPOS LHC models. [ABSTRACT FROM AUTHOR]
Copyright of European Physical Journal C -- Particles & Fields is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Datenbank: Complementary Index
Beschreibung
Abstract:Event-by-event fluctuations of the event-wise mean transverse momentum, ⟨ p T ⟩ , of charged particles produced in proton–proton (pp) collisions at s = 5.02 TeV, Xe–Xe collisions at s NN = 5.44 TeV, and Pb–Pb collisions at s NN = 5.02 TeV are studied using the ALICE detector based on the integral correlator ⟨ ⟨ Δ p T Δ p T ⟩ ⟩ . The correlator strength is found to decrease monotonically with increasing produced charged-particle multiplicity measured at midrapidity in all three systems. In Xe–Xe and Pb–Pb collisions, the multiplicity dependence of the correlator deviates significantly from a simple power-law scaling as well as from the predictions of the HIJING and AMPT models. The observed deviation from power-law scaling is expected from transverse radial flow in semicentral to central Xe–Xe and Pb–Pb collisions. In pp collisions, the correlation strength is also studied by classifying the events based on the transverse spherocity, S 0 , of the particle production at midrapidity, used as a proxy for the presence of a pronounced back-to-back jet topology. Low-spherocity (jetty) events feature a larger correlation strength than those with high spherocity (isotropic). The strength and multiplicity dependence of jetty and isotropic events are well reproduced by calculations with the PYTHIA 8 and EPOS LHC models. [ABSTRACT FROM AUTHOR]
ISSN:14346044
DOI:10.1140/epjc/s10052-025-14325-4