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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10303 - Particles and field physics

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

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

Rok uplatnění

2023

Kód důvěrnosti údajů

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

Název periodika

Journal of High Energy Physics

ISSN

1029-8479

e-ISSN

1029-8479

Svazek periodika

2023

Číslo periodika v rámci svazku

6

Stát vydavatele periodika

IT - Italská republika

Počet stran výsledku

36

Strana od-do

—

Kód UT WoS článku

001035475300001

EID výsledku v databázi Scopus

2-s2.0-85161804309