A1 Journal article (refereed)
Underlying event properties in pp collisions at √s = 13 TeV (2020)

ALICE collaboration. (2020). Underlying event properties in pp collisions at √s = 13 TeV. Journal of High Energy Physics, 2020(4), Article 192. https://doi.org/10.1007/JHEP04(2020)192

JYU authors or editors

Publication details

All authors or editors: ALICE collaboration

Journal or series: Journal of High Energy Physics

ISSN: 1126-6708

eISSN: 1029-8479

Publication year: 2020

Volume: 2020

Issue number: 4

Article number: 192

Publisher: Springer

Publication country: Germany

Publication language: English

DOI: https://doi.org/10.1007/JHEP04(2020)192

Publication open access: Openly available

Publication channel open access: Open Access channel

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/68956

Web address of parallel published publication (pre-print): https://arxiv.org/abs/1910.14400


This article reports measurements characterizing the Underlying Event (UE) associated with hard scatterings at midrapidity (|η| < 0.8) in pp collisions at s√ = 13 TeV. The hard scatterings are identified by the leading particle, the charged particle with the highest transverse momentum (pleadingT) in the event. Charged-particle number-densities and summed transverse-momentum densities are measured in different azimuthal regions defined with respect to the leading particle direction: Toward, Transverse, and Away. The Toward and Away regions contain the fragmentation products of the hard scatterings in addition to the UE contribution, whereas particles in the Transverse region are expected to originate predominantly from the UE. The study is performed as a function of pleadingT with three different pT thresholds for the associated particles, ptrackT > 0.15, 0.5, and 1.0 GeV/c. The charged-particle density in the Transverse region rises steeply for low values of pleadingT and reaches a plateau. The results confirm the trend that the charged-particle density in the Transverse region shows a stronger increase with s√ than the inclusive charged-particle density at midrapidity. The UE activity is increased by approximately 20% when going from 7 TeV to 13 TeV pp collisions. The plateau in the Transverse region (5

Free keywords: Hadron-Hadron scattering (experiments)

Contributing organizations

Ministry reporting: Yes

Reporting Year: 2020

JUFO rating: 2

Last updated on 2022-14-09 at 12:01