Underlying-event properties in pp and p-Pb collisions at √sNN=5.02 TeV



Acharya, S, Adamova, D, Adler, A, Rinella, G Aglieri, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU, Ahuja, I
et al (show 1022 more authors) (2023) Underlying-event properties in pp and p-Pb collisions at √sNN=5.02 TeV JOURNAL OF HIGH ENERGY PHYSICS, 2023 (6). 23-. ISSN 1126-6708, 1029-8479

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Abstract

We report about the properties of the underlying event measured with ALICE at the LHC in pp and p–Pb collisions at sNN = 5.02 TeV. The event activity, quantified by charged-particle number and summed-p <inf>T</inf> densities, is measured as a function of the leading-particle transverse momentum (pTtrig) . These quantities are studied in three azimuthal-angle regions relative to the leading particle in the event: toward, away, and transverse. Results are presented for three different p <inf>T</inf> thresholds (0.15, 0.5 and 1 GeV/c) at mid-pseudorapidity (|η| < 0.8). The event activity in the transverse region, which is the most sensitive to the underlying event, exhibits similar behaviour in both pp and p–Pb collisions, namely, a steep increase with pTtrig for low pTtrig , followed by a saturation at pTtrig≈5 GeV/c. The results from pp collisions are compared with existing measurements at other centre-of-mass energies. The quantities in the toward and away regions are also analyzed after the subtraction of the contribution measured in the transverse region. The remaining jet-like particle densities are consistent in pp and p–Pb collisions for pTtrig>10 GeV/c, whereas for lower pTtrig values the event activity is slightly higher in p–Pb than in pp collisions. The measurements are compared with predictions from the PYTHIA 8 and EPOS LHC Monte Carlo event generators. [Figure not available: see fulltext.].

Item Type: Article
Uncontrolled Keywords: Properties of Hadrons, Quark-Gluon Plasma
Depositing User: Symplectic Admin
Date Deposited: 14 Aug 2024 14:58
Last Modified: 16 Jun 2026 08:04
DOI: 10.1007/JHEP06(2023)023
Open Access URL: https://doi.org/10.1007/JHEP06(2023)023
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3183748
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