System-size dependence of the charged-particle pseudorapidity density at √SNN=5.02 TeVfor pp, p-Pb, and Pb-Pb collisions



Acharya, S, Adamova, D, Adler, A, Rinella, G Aglieri, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU, Ahuja, I
et al (show 1013 more authors) (2023) System-size dependence of the charged-particle pseudorapidity density at √SNN=5.02 TeVfor pp, p-Pb, and Pb-Pb collisions PHYSICS LETTERS B, 845. p. 137730. ISSN 0370-2693, 1873-2445

Access the full-text of this item by clicking on the Open Access link.

Abstract

We present the first systematic comparison of the charged-particle pseudorapidity densities for three widely different collision systems, pp, p–Pb, and Pb–Pb, at the top energy of the Large Hadron Collider (s<inf>NN</inf>=5.02TeV) measured over a wide pseudorapidity range (−3.5<η<5), the widest possible among the four experiments at that facility. The systematic uncertainties are minimised since the measurements are recorded by the same experimental apparatus (ALICE). The distributions for p–Pb and Pb–Pb collisions are determined as a function of the centrality of the collisions, while results from pp collisions are reported for inelastic events with at least one charged particle at midrapidity. The charged-particle pseudorapidity densities are, under simple and robust assumptions, transformed to charged-particle rapidity densities. This allows for the calculation and the presentation of the evolution of the width of the rapidity distributions and of a lower bound on the Bjorken energy density, as a function of the number of participants in all three collision systems. We find a decreasing width of the particle production, and roughly a smooth ten fold increase in the energy density, as the system size grows, which is consistent with a gradually higher dense phase of matter.

Item Type: Article
Uncontrolled Keywords: 5106 Nuclear and Plasma Physics, 5107 Particle and High Energy Physics, 51 Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 14 Aug 2024 14:33
Last Modified: 23 May 2026 07:55
DOI: 10.1016/j.physletb.2023.137730
Open Access URL: https://doi.org/10.1016/j.physletb.2023.137730
Related Websites:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3183738
Disclaimer: The University of Liverpool is not responsible for content contained on other websites from links within repository metadata. Please contact us if you notice anything that appears incorrect or inappropriate.