Acharya2021_Article_JetFragmentationTransverseMome.pdf
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Jet fragmentation transverse momentum distributions in pp and p-Pb collisions at √s, √sNN = 5.02 TeV

Main Author
ALICE collaboration
Format
Articles Research article
Published
2021
Series
Journal of High Energy Physics
Subjects
Jet fragmentation transverse momentum (jT) distributions are measured in proton-proton (pp) and proton-lead (p-Pb) collisions at √sNN = 5.02 TeV with the ALICE experiment at the LHC. Jets are reconstructed with the ALICE tracking detectors and electromagnetic calorimeter using the anti-kT algorithm with resolution parameter R = 0.4 in the pseudorapidity range |η| < 0.25. The jT values are calculated for charged particles inside a fixed cone with a radius R = 0.4 around the reconstructed jet axis. The measured jT distributions are compared with a variety of parton-shower models. Herwig and PYTHIA 8 based models describe the data well for the higher jT region
while they underestimate the lower jT region. The jT distributions are further characterised by fitting them with a function composed of an inverse gamma function for higher jT values (called the “wide component”)
related to the perturbative component of the fragmentation process
and with a Gaussian for lower jT values (called the “narrow component”)
predominantly connected to the hadronisation process. The width of the Gaussian has only a weak dependence on jet transverse momentum
while that of the inverse gamma function increases with increasing jet transverse momentum. For the narrow component
the measured trends are successfully described by all models except for Herwig. For the wide component
Herwig and PYTHIA 8 based models slightly underestimate the data for the higher jet transverse momentum region. These measurements set constraints on models of jet fragmentation and hadronisation.
hiukkasfysiikka
Publication in research information system
https://converis.jyu.fi/converis/portal/detail/Publication/101930030
Publisher
Springer
The permanent address of the publication
https://urn.fi/URN:NBN:fi:jyu-202111185711Use this for linking
Review status
Peer reviewed
ISSN
1126-6708
DOI
https://doi.org/10.1007/JHEP09(2021)211
Language
English
Published in
Journal of High Energy Physics
Citation
  • ALICE collaboration. (2021). Jet fragmentation transverse momentum distributions in pp and p-Pb collisions at √s, √sNN = 5.02 TeV. Journal of High Energy Physics, 2021(9), Article 211. https://doi.org/10.1007/JHEP09(2021)211
License
CC BY 4.0Open Access
Copyright© CERN, for the benefit of the ALICE Collaboration. Article funded by SCOAP3.

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