Acharya2022_Article_MultiplicityDependenceOfCharge.pdf
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Multiplicity dependence of charged-particle jet production in pp collisions at √s = 13 TeV

Abstract
The multiplicity dependence of jet production in pp collisions at the centre-of-mass energy of √s=13 TeV is studied for the first time. Jets are reconstructed from charged particles using the anti-kT algorithm with resolution parameters R varying from 0.2 to 0.7. The jets are measured in the pseudorapidity range |ηjet|<0.9−R and in the transverse momentum range 5<140 GeV/c. The multiplicity intervals are categorised by the ALICE forward detector V0. The pT differential cross section of charged-particle jets are compared to leading order (LO) and next-to-leading order (NLO) perturbative quantum chromodynamics (pQCD) calculations. It is found that the data are better described by the NLO calculation, although the NLO prediction overestimates the jet cross section below 20 GeV/c. The cross section ratios for different R are also measured and compared to model calculations. These measurements provide insights into the angular dependence of jet fragmentation. The jet yield increases with increasing self-normalised charged-particle multiplicity. This increase shows only a weak dependence on jet transverse momentum and resolution parameter at the highest multiplicity. While such behaviour is qualitatively described by the present version of PYTHIA, quantitative description may require implementing new mechanisms for multi-particle production in hadronic collisions.
Main Author
ALICE Collaboration
Format
Articles Research article
Published
2022
Series
European Physical Journal C
Subjects
kvanttiväridynamiikka
hiukkasfysiikka
Publication in research information system
https://converis.jyu.fi/converis/portal/detail/Publication/150891183
Publisher
Springer Science and Business Media LLC
The permanent address of the publication
https://urn.fi/URN:NBN:fi:jyu-202208164118Use this for linking
Review status
Peer reviewed
ISSN
1434-6044
DOI
https://doi.org/10.1140/epjc/s10052-022-10405-x
Language
English
Published in
European Physical Journal C
Citation
License
CC BY 4.0Open Access
Copyright© CERN for the benefit of the ALICE collaboration 2022

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description The multiplicity dependence of jet production in pp collisions at the centre-of-mass energy of √s=13 TeV is studied for the first time. Jets are reconstructed from charged particles using the anti-kT algorithm with resolution parameters R varying from 0.2 to 0.7. The jets are measured in the pseudorapidity range |ηjet|<0.9−R and in the transverse momentum range 5<140 GeV/c. The multiplicity intervals are categorised by the ALICE forward detector V0. The pT differential cross section of charged-particle jets are compared to leading order (LO) and next-to-leading order (NLO) perturbative quantum chromodynamics (pQCD) calculations. It is found that the data are better described by the NLO calculation, although the NLO prediction overestimates the jet cross section below 20 GeV/c. The cross section ratios for different R are also measured and compared to model calculations. These measurements provide insights into the angular dependence of jet fragmentation. The jet yield increases with increasing self-normalised charged-particle multiplicity. This increase shows only a weak dependence on jet transverse momentum and resolution parameter at the highest multiplicity. While such behaviour is qualitatively described by the present version of PYTHIA, quantitative description may require implementing new mechanisms for multi-particle production in hadronic collisions.
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title Multiplicity dependence of charged-particle jet production in pp collisions at √s = 13 TeV
title_full Multiplicity dependence of charged-particle jet production in pp collisions at √s = 13 TeV
title_fullStr Multiplicity dependence of charged-particle jet production in pp collisions at √s = 13 TeV
title_full_unstemmed Multiplicity dependence of charged-particle jet production in pp collisions at √s = 13 TeV
title_short Multiplicity dependence of charged-particle jet production in pp collisions at √s = 13 TeV
title_sort Multiplicity dependence of chargedparticle jet production in pp collisions at √s 13 TeV
topic kvanttiväridynamiikka hiukkasfysiikka
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