Underlying Event properties in pp collisions at $\sqrt{s}= 13 $ TeV

S. Acharya , Daniel Dąbrowski , Kamil Deja , Łukasz Graczykowski , Monika Jakubowska , Małgorzata Janik , Adam Kisiel , Julian Myrcha , Łukasz Neumann , Piotr Nowakowski , Janusz Oleniacz , Jan Pluta , Przemysław Rokita , Krystian Rosłon , M. O. Schmidt , Tomasz Trzciński , Hanna Zbroszczyk

Abstract

This article reports measurements characterizing the Underlying Event (UE) associated with hard scatterings at midrapidity (|$\eta$| < 0.8) in pp collisions at $\sqrt{s}$ = 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
Collective authorThe ALICE Collaboration
Author S. Acharya - [Variable Energy Cyclotron Centre India]
S. Acharya,,
-
-
, Daniel Dąbrowski (FP / NPD)
Daniel Dąbrowski,,
- Nuclear Physics Division
, Kamil Deja (FEIT / ICS)
Kamil Deja,,
- The Institute of Computer Science
, Łukasz Graczykowski (FP / NPD)
Łukasz Graczykowski,,
- Nuclear Physics Division
, Monika Jakubowska (FoEE / ICIE)
Monika Jakubowska,,
- The Institute of Control and Industrial Electronics
, Małgorzata Janik (FP / NPD)
Małgorzata Janik,,
- Nuclear Physics Division
, Adam Kisiel (FP / NPD)
Adam Kisiel,,
- Nuclear Physics Division
, Julian Myrcha (FEIT / IN)
Julian Myrcha,,
- The Institute of Computer Science
, Łukasz Neumann (FEIT / ICS)
Łukasz Neumann,,
- The Institute of Computer Science
, Piotr Nowakowski (FEIT / ICS)
Piotr Nowakowski,,
- The Institute of Computer Science
et al.`
Total number of authors1007
Journal seriesJournal of High Energy Physics, ISSN 1029-8479, [1126-6708]
Issue year2020
No77
Pages1-31
Publication size in sheets1.5
Article number192
Keywords in Polish QCD ; relativistic heavy ion physics ; particle and resonance production ; experimental results
ASJC Classification3106 Nuclear and High Energy Physics
DOIDOI:10.1007/JHEP04(2020)192
URL https://link.springer.com/article/10.1007%2FJHEP04%282020%29192
Languageen angielski
Score (nominal)140
Score sourcejournalList
ScoreMinisterial score = 140.0, 22-09-2020, ArticleFromJournal
Publication indicators WoS Citations = 0; Scopus Citations = 0; Scopus SNIP (Source Normalised Impact per Paper): 2018 = 1.132; WoS Impact Factor: 2018 = 5.833 (2) - 2018=4.911 (5)
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