Underlying Event properties in pp collisions at $\sqrt{s}= 13 $ TeV
Authors:
- S. Acharya,
- Daniel Dąbrowski,
- Kamil Deja,
- Łukasz Graczykowski,
- Monika Jakubowska,
- Małgorzata Janik,
- Przemysław Karczmarczyk,
- Adam Kisiel,
- Julian Myrcha,
- Łukasz Neumann,
- Piotr Nowakowski,
- Janusz Oleniacz,
- Jan Pluta,
- Przemysław Rokita,
- Krystian Rosłon,
- 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
- Record ID
- WUT217020e10fc94fd688326a61cfc105b6
- Author
- Total number of authors
- 1007
- Collective author
- The ALICE Collaboration
- Journal series
- Journal of High Energy Physics, ISSN 1029-8479, [1126-6708]
- Issue year
- 2020
- Vol
- 2020
- No
- 4
- Pages
- 1-31
- Publication size in sheets
- 1.50
- Article number
- 192
- Keywords in Polish
- QCD ; relativistic heavy ion physics ; particle and resonance production ; experimental results
- ASJC Classification
- DOI
- DOI:10.1007/JHEP04(2020)192 Opening in a new tab
- URL
- https://link.springer.com/article/10.1007%2FJHEP04%282020%29192 Opening in a new tab
- Language
- (en) English
- Score (nominal)
- 140
- Score source
- journalList
- Score
- = 140.0, 03-05-2022, ArticleFromJournal
- Publication indicators
- = 3; = 6; : 2018 = 1.132; : 2020 (2 years) = 5.810 - 2020 (5 years) =4.977
- Uniform Resource Identifier
- https://repo.pw.edu.pl/info/article/WUT217020e10fc94fd688326a61cfc105b6/
- URN
urn:pw-repo:WUT217020e10fc94fd688326a61cfc105b6
* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or PerishOpening in a new tab system.