Jet overlap in heavy ion collisions at energies available at the CERN Large Hadron Collider and its consequences for the jet shape

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F20%3A00342877" target="_blank" >RIV/68407700:21340/20:00342877 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1103/PhysRevC.101.014905" target="_blank" >https://doi.org/10.1103/PhysRevC.101.014905</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevC.101.014905" target="_blank" >10.1103/PhysRevC.101.014905</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Jet overlap in heavy ion collisions at energies available at the CERN Large Hadron Collider and its consequences for the jet shape

Popis výsledku v původním jazyce

Central lead-lead collisions at energies available at the CERN Large Hadron Collider (LHC) may pose a particular challenge for jet identification as multiple jets are produced per each collision event. We simulate the jet evolution in central PbPb events at root s(NN) = 2.76 GeV collision energy with the EPos3 initial state, which typically contains multiple hard scatterings in each event. Therefore the partons from different jets have a significant chance to overlap in momentum space. We find that 30% of the jets with p(perpendicular to) > 50 GeV, identified by the standard anti-k(perpendicular to) jet finding algorithm with jet cone size R = 0.3, contain "intruder" particles from overlapping generator-level jets. This fraction increases with increasing beam energy and increasing R. The reconstructed momentum of the jet differs from that of the modeled jet by the loss due to jet partons which are outside of the jet cone and by the gain due to intruder partons. The sum of both may be positive or negative. These intruder partons particularly affect the radial jet momentum distribution because they contribute mostly at large angles Delta r with respect to the jet center. The study stresses the importance of the jet overlap effect emerging in central lead-lead collisions at LHC energies, while being negligible in peripheral PbPb or pPb/pp collisions.

Název v anglickém jazyce

Jet overlap in heavy ion collisions at energies available at the CERN Large Hadron Collider and its consequences for the jet shape

Popis výsledku anglicky

Central lead-lead collisions at energies available at the CERN Large Hadron Collider (LHC) may pose a particular challenge for jet identification as multiple jets are produced per each collision event. We simulate the jet evolution in central PbPb events at root s(NN) = 2.76 GeV collision energy with the EPos3 initial state, which typically contains multiple hard scatterings in each event. Therefore the partons from different jets have a significant chance to overlap in momentum space. We find that 30% of the jets with p(perpendicular to) > 50 GeV, identified by the standard anti-k(perpendicular to) jet finding algorithm with jet cone size R = 0.3, contain "intruder" particles from overlapping generator-level jets. This fraction increases with increasing beam energy and increasing R. The reconstructed momentum of the jet differs from that of the modeled jet by the loss due to jet partons which are outside of the jet cone and by the gain due to intruder partons. The sum of both may be positive or negative. These intruder partons particularly affect the radial jet momentum distribution because they contribute mostly at large angles Delta r with respect to the jet center. The study stresses the importance of the jet overlap effect emerging in central lead-lead collisions at LHC energies, while being negligible in peripheral PbPb or pPb/pp collisions.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10301 - Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect)

Projekt

<a href="/cs/project/EF16_019%2F0000778" target="_blank" >EF16_019/0000778: Centrum pokročilých aplikovaných přírodních věd</a><br>

Návaznosti

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

Rok uplatnění

2020

Kód důvěrnosti údajů

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

Název periodika

PHYSICAL REVIEW C

ISSN

2469-9985

e-ISSN

2469-9993

Svazek periodika

101

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

8

Strana od-do

—

Kód UT WoS článku

000506591300003

EID výsledku v databázi Scopus

2-s2.0-85078132247