Production of pions, kaons, and protons as a function of the relative transverse activity classifier in pp collisions at root s=13 TeV

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F23%3A00368621" target="_blank" >RIV/68407700:21340/23:00368621 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1007/JHEP06(2023)027" target="_blank" >https://doi.org/10.1007/JHEP06(2023)027</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/JHEP06(2023)027" target="_blank" >10.1007/JHEP06(2023)027</a>

Result language

angličtina

Original language name

Production of pions, kaons, and protons as a function of the relative transverse activity classifier in pp collisions at root s=13 TeV

Original language description

The production of pi (+/-), K-+/-, and ((P) over bar )p is measured in pp collisions at root s = 13TeV 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, R-T = N-T/< N-T >, 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 < N-T > is the mean value over all the analysed events. The first measurements of identified particle p(T) spectra as a function of R-T in the three topological regions are reported. It is found that the yield of high transverse momentum particles relative to the R-T-integrated measurement decreases with increasing R-T in both the toward and the away regions, indicating that the softer UE dominates particle production as RT increases and validating that R-T 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) over bar)/( pi(+) + pi(-)) and (K+ + K-)/(pi(+) + K-) in the low UE limit ( R-T -> 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.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10303 - Particles and field physics

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2023

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Journal of High Energy Physics

ISSN

1029-8479

e-ISSN

1029-8479

Volume of the periodical

2023

Issue of the periodical within the volume

6

Country of publishing house

IT - ITALY

Number of pages

36

Pages from-to

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UT code for WoS article

001035475300001

EID of the result in the Scopus database

2-s2.0-85161804309