Importance of initial and final state effects for azimuthal correlations in p+Pb collisions

  • We study the influence and interplay of initial state and final state effects in the dynamics of small systems, focusing on azimuthal correlations at different multiplicities. To this end we introduce a new model, matching the classical Yang-Mills dynamics of pre-equilibrium gluon fields (IP-GLASMA) to a perturbative QCD based parton cascade for the final state evolution (BAMPS) on an event-by-event basis. Depending on multiplicity of the event, we see transverse momentum dependent signatures of the initial, but also the final state in azimuthal correlation observables, such as v2 {2PC}(pT). In low-multiplicity events, initial state correlations dominate for transverse momenta pT > 2 GeV, whereas in high-multiplicity events and at low momenta final state interactions dominate and initial state correlations strongly affect v2 {2PC}(pT) for pT > 2 GeV as well as the pT integrated v2 {2PC}. Nearly half of the final pT integrated v2 {2PC} is contributed by the initial state in low-multiplicity events, whereas in high-multiplicity the share is much less. Based on Ref. [M. Greif, C. Greiner, B. Schenke, S. Schlichting, Z. Xu, Phys. Rev. D96 (9) (2017) 091504], we are now able to carry out a systematic multiplicity scan, probing the dynamics on the border of initial state dominated to final state dominated – but not yet hydrodynamic regime.

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Author:Moritz GreifORCiDGND, Carsten GreinerGND, Björn Peter SchenkeORCiDGND, Sören SchlichtingORCiDGND, Zhe Xu
Parent Title (English):Nuclear Physics A
Place of publication:Amsterdam
Document Type:Article
Date of Publication (online):2019/01/22
Date of first Publication:2019/01/22
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Contributing Corporation:International Conference on Ultrarelativistic Nucleus-Nucleus Collisions (27. : 2018 : Venedig)
Release Date:2023/10/27
Tag:Final state; IPGLASMA; Initial state; Parton cascade BAMPS; Small systems
Page Number:4
First Page:491
Last Page:494
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Licence (German):License LogoCreative Commons - CC BY-NC-ND - Namensnennung - Nicht kommerziell - Keine Bearbeitungen 4.0 International