학술논문
Underlying-event properties in pp and p–Pb collisions at sNN = 5.02 TeV
Document Type
Original Paper
Author
Source
Journal of High Energy Physics. 2023(6)
Subject
Language
English
ISSN
1029-8479
Abstract
Abstract: We report about the properties of the underlying event measured with ALICE at the LHC in pp and p–Pb collisions at sNNpTtrigpTtrigpTtrigpTtrig≈5pTtrig>10pTtrig = 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 sNNpTtrigpTtrigpTtrigpTtrig≈5pTtrig>10pTtrig. 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 sNNpTtrigpTtrigpTtrigpTtrig≈5pTtrig>10pTtrig for low sNNpTtrigpTtrigpTtrigpTtrig≈5pTtrig>10pTtrig, followed by a saturation at sNNpTtrigpTtrigpTtrigpTtrig≈5pTtrig>10pTtrig 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 sNNpTtrigpTtrigpTtrigpTtrig≈5pTtrig>10pTtrig GeV/c, whereas for lower sNNpTtrigpTtrigpTtrigpTtrig≈5pTtrig>10pTtrig 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.