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

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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 Te. The event activity, quantified by charged-particle number and summed-pT densities, is measured as a function of the leading-particle transverse momentum (Pt trig). These q...

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Main Authors: Acharya, Shreyasi (Author) , Angelov, Venelin (Author) , Berdnikova, Anastasia (Author) , Bergmann, Luisa (Author) , Danisch, Meike (Author) , Feuillard, Victor (Author) , Fokin, Ilya D. (Author) , Glässel, Peter (Author) , Kroesen, Martin (Author) , López, Jorge (Author) , Nath, Abhishek (Author) , Pachmayer, Yvonne C. (Author) , Reygers, Klaus (Author) , Schicker, Rainer (Author) , Skorodumovs, Georgijs (Author) , Stachel, Johanna (Author) , Stiefelmaier, Stephan (Author) , Veen, Casper Arie van (Author) , Völkl, Martin (Author) , Windelband, Bernd (Author) , Yüncü, Alperen (Author) , Zanone, Federica (Author)
Corporate Author: ALICE (Author)
Format: Article (Journal)
Language:English
Published: June 5, 2023
In: Journal of high energy physics
Year: 2023, Issue: 6, Pages: 1-38
ISSN:1029-8479
DOI:10.1007/JHEP06(2023)023
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1007/JHEP06(2023)023
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Author Notes:The ALICE collaboration
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Summary: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 Te. The event activity, quantified by charged-particle number and summed-pT densities, is measured as a function of the leading-particle transverse momentum (Pt trig). 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 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.
Item Description:Im Titel steht der Ausdruck "sNN" unter dem Wurzelsymbol, "NN" ist dabei tiefgestellt
The ALICE collaboration: S. Acharya, V. Anguelov, A. Berdnikova, L. Bergmann, M.C. Danisch, V.J.G. Feuillard, S. Fokin, P. Glässel, M. Kroesen, J. Lopez, A. Nath, Y. Pachmayer, K. Reygers, R. Schicker, G. Skorodumovs, J. Stachel, S. Stiefelmaier, C.A. van Veen, M. Völkl, B. Windelband, A. Yüncü, F. Zanone [und viele weitere]
Gesehen am 25.10.2023
Physical Description:Online Resource
ISSN:1029-8479
DOI:10.1007/JHEP06(2023)023

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