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

Result code in 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>

Result on the web

<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>

Result language

angličtina

Original language name

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

Original language description

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.

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

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

Project

<a href="/en/project/EF16_019%2F0000778" target="_blank" >EF16_019/0000778: Center for advanced applied science</a><br>

Continuities

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

Publication year

2020

Confidentiality

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

Name of the periodical

PHYSICAL REVIEW C

ISSN

2469-9985

e-ISSN

2469-9993

Volume of the periodical

101

Issue of the periodical within the volume

1

Country of publishing house

US - UNITED STATES

Number of pages

8

Pages from-to

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UT code for WoS article

000506591300003

EID of the result in the Scopus database

2-s2.0-85078132247