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Article
Report number arXiv:2301.10120 ; CERN-EP-2022-286
Title Production of pions, kaons, and protons as a function of the relative transverse activity classifier in pp collisions at s = 13 TeV
Related titleProduction of pions, kaons and protons as a function of the transverse event activity in pp collisions at s = 13 TeV
Author(s) ALICE Collaboration  Показать всех 1045 авторов
Corporate author(s) The ALICE collaboration
Publication 2023-06-06
Imprint 13 Dec 2022
Number of pages 32
Note 32 pages, 11 captioned figures, 3 tables, authors from page 27, published version, fixed background color in some figures, figures at http://alice-publications.web.cern.ch/node/8869
Published in: JHEP 2306 (2023) 027
DOI 10.1007/JHEP06(2023)027
Subject category Nuclear Physics - Experiment ; Nuclear Physics - Experiment ; Particle Physics - Experiment
Accelerator/Facility, Experiment CERN LHC ; ALICE
Keywords QCD ; particle and resonance production ; experimental results
Abstract The production of π±, K±, and (¯p)p is measured in pp collisions at s = 13 TeV in different topological regions of the events. Particle transverse momentum (pT) spectra are measured in the ``toward'', ``transverse'', and ``away'' angular regions defined with respect to the direction of the leading particle in the event. While the toward and away regions contain the fragmentation products of the near-side and away-side jets, respectively, the transverse region is dominated by particles from the Underlying Event (UE). The relative transverse activity classifier, RT=NT/NT, is used to group events according to their UE activity, where NT is the measured charged-particle multiplicity per event in the transverse region and NT is the mean value over all the analysed events. The first measurements of identified particle pT spectra as a function of RT in the three topological regions are reported. It is found that the yield of high transverse momentum particles relative to the RT-integrated measurement decreases with increasing RT in both the toward and the away regions, indicating that the softer UE dominates particle production as RT increases and validating that RT can be used to control the magnitude of the UE. Conversely, the spectral shapes in the transverse region harden significantly with increasing RT. This hardening follows a mass ordering, being more significant for heavier particles. Finally, it is observed that the pT-differential particle ratios (p+¯p)/(π++π) and (K++K)/(π++π) in the low UE limit (RT0) approach expectations from Monte Carlo generators such as PYTHIA 8 and EPOS LHC, where the jet-fragmentation models have been tuned to reproduce e+e results.
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Copyright/License publication: © 2023-2025 CERN (License: CC-BY-4.0), sponsored by SCOAP³
preprint: © 2022-2025 CERN (License: CC-BY-4.0)
Submitted by francesco.prino@cern.ch



 


 Запись создана 2022-11-24, последняя модификация 2025-01-14


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