Rapidity and multiplicity dependence of charged-particle flow in p Pb collisions at s NN = 8.16 TeV

Journal article

The elliptic and triangular flow of charged particles are measured using two-particle angular correlations in pPb collisions in the pseudorapidity range 2.0 < |η| < 4.8. The data sample was collected by the LHCb experiment in 2016 at a centre-of-mass energy per nucleon pair of sNN=8.16 TeV, containing in total approximately 1.5 billion collision events. Non-flow contributions are obtained in low-multiplicity collisions and subtracted to extract the flow harmonics. The results are presented as a function of event multiplicity and hadron transverse momentum. Comparisons with a full (3+1)D dynamic model indicate that it overestimates the measured elliptic flow. A comparison between the forward and backward regions reveals no significant differences in flow parameters, suggesting that final-state effects may dominate over initial-state effects in the origin of flow in small systems.

Authors: Aaij, R; Abdelmotteleb, ASW; Abellan Beteta, C; Abudinén, F; Ackernley, T

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: Springer
• Journal: Journal of High Energy Physics
• Volume: 2025
• Issue: 10
• Article number: 124
• Publication date: 2025-10-15
• Acceptance date: 2025-09-16
• DOI: 10.1007/jhep10(2025)124
• EISSN: 1029-8479
• ISSN: 1126-6708
• Language: English
• Keywords: Particle Correlations and Fluctuations; Relativistic Heavy Ion Physics; Heavy Ion Experiments; Collective Flow