Production of pions, kaons, and protons as a function of the relative transverse activity classifier in pp collisions at √s = 13 TeV
Visualizar/abrir
Data
2023Tipo
Abstract
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 fro ...
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/hNTi, 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 hNTi 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 (RT → 0) approach expectations from Monte Carlo generators such as PYTHIA 8 with Monash 2013 tune and EPOS LHC, where the jet-fragmentation models have been tuned to reproduce e +e − results. ...
Contido em
The journal of high energy physics. Trieste. No. 6 (June 2023), 027, 35 p.
Origem
Estrangeiro
Coleções
-
Artigos de Periódicos (39166)Ciências Exatas e da Terra (5964)
Este item está licenciado na Creative Commons License