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

Autori
Acharya, S. ; … ; Erhardt, Filip ; … ; Gotovac, Sven ; …. ; Jercic, Marko ; … ; Karatovic, David ; … ; Loncar, Petra ; … ; Mudnic, Eugen ; … ; Planinic, Mirko ; … ; Poljak, Nikola ; … ; Vickovic, Linda ; … ; Zurlo, N.

Kolaboracija
ALICE Collaboration

Izvornik
Journal of High Energy Physics (1029-8479) 2023 (2023), 6; 23, 38

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Properties of Hadrons ; Quark-Gluon Plasma ; leading particle: transverse momentum ; p p: scattering ; p nucleus: scattering ; particle: density ; underlying event ; transverse ; CERN LHC Coll ; Monte Carlo ; charged particle ; ALICE ; PYTHIA ; experimental results ; 5020 GeV-cms/nucleon

Sažetak
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-pT densities, is measured as a function of the leading- particle transverse momentum (𝑝trigT). 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 pT 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 𝑝trigT for low 𝑝trigT, followed by a saturation at 𝑝trigT≈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 𝑝trigT>10 GeV/c, whereas for lower 𝑝trigT 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.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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