Underlying-event properties in pp and p–Pb collisions at √s.sub.NN./sub. = 5.02 TeV

0575579 - ÚJF 2024 RIV US eng J - Journal Article
Acharya, S. - Adamová, Dagmar - Adler, A. - Aglieri Rinella, G. - Bielčík, J. - Bielčíková, Jana - Broz, M. - Contreras, J. G. - Filová, V. - Grecká, Ekaterina - Grund, D. - Herman, T. - Horák, D. - Isakov, Artem - Kotliarov, Artem - Krupová, D. M. - Křížek, Filip - Křížková Gajdošová, K. - Kushpil, Svetlana - Petráček, V. - Šafařík, K. - Torres, S. R. - Závada, Petr … Total 1032 authors
Underlying-event properties in pp and p–Pb collisions at √s_NN = 5.02 TeV.
Journal of High Energy Physics. Roč. 2023, č. 6 (2023), č. článku 23. ISSN 1029-8479. E-ISSN 1029-8479
Research Infrastructure: CERN-CZ III - 90240
Institutional support: RVO:68378271 ; RVO:61389005
Keywords : ALICE collaboration * Properties of Hadrons * Quark-Gluon Plasma
OECD category: Nuclear physics; Particles and field physics (FZU-D)
Impact factor: 5.4, year: 2022
Method of publishing: Open access
https://doi.org/10.1007/JHEP06(2023)023

We report about the properties of the underlying event measured with ALICE at the LHC in pp and p-Pb collisions at root sNN = 5.02 TeV. The event activity, quantified by charged-particle number and summed- pT densities, is measured as a function of the leadingparticle transverse momentum (p(T)(trig)). These quantities are studied in three azimuthalangle regions relative to the leading particle in the event: toward, away, and transverse. Results are presented for three different p(T) thresholds (0.15, 0.5 and 1 GeV/c) at midpseudorapidity (|eta| < 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 p(T)(trig) for low p(trig) (T), followed by a saturation at p(T)(trig) approximate to 5 GeV/c. The results from pp collisions are compared with existing measurements at other centre-ofmass 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 p(trig) (T) > 10 GeV/c, whereas for lower p(T)(trig) 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.
Permanent Link: https://hdl.handle.net/11104/0345336