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 4.0

Open Access

Copyright© CERN, for the benefit of the ALICE Collaboration. Article funded by SCOAP3.