Search for jet quenching effects in high-multiplicity proton-proton collisions at root s = 13TeV

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F21%3A00546394" target="_blank" >RIV/61389005:_____/21:00546394 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/61389005:_____/21:00552960

Výsledek na webu

<a href="http://dx.doi.org/10.22323/1.387.0156" target="_blank" >http://dx.doi.org/10.22323/1.387.0156</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.22323/1.387.0156" target="_blank" >10.22323/1.387.0156</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Search for jet quenching effects in high-multiplicity proton-proton collisions at root s = 13TeV

Popis výsledku v původním jazyce

The ALICE Collaboration reports results of a novel approach to jet-quenching measurements in high-multiplicity pp collisions at roots = 13 TeV, searching for broadening of the acoplanarity distribution measured by the semi-inclusive distribution of jets recoiling from a high-pT hadron. Charged-particle jet reconstruction is carried out using the anti-kT algorithm with R = 0.4. A data-driven statistical method is used to correct the recoil jet yield for uncorrelated background, including multi-partonic interactions. High-multiplicity (HM) pp events are selected based on charged-particle multiplicity registered in forward scintillator detectors, and their acoplanarity distributions are compared to those for Minimum Bias (MB) events. Significant broadening is observed in the acoplanarity distribution of HM events, consistent with jet quenching. However, qualitatively similar features are also seen in a simulated population of pp collisions generated by PYTHIA 8 Monash, which does not incorporate jet quenching. We utilize these PYTHIA simulations to explore the origin of the observed effect. The PYTHIA simulations suggest that the enhanced acoplanarity results from the bias induced by the HM selection towards multi-jet final states.

Název v anglickém jazyce

Search for jet quenching effects in high-multiplicity proton-proton collisions at root s = 13TeV

Popis výsledku anglicky

The ALICE Collaboration reports results of a novel approach to jet-quenching measurements in high-multiplicity pp collisions at roots = 13 TeV, searching for broadening of the acoplanarity distribution measured by the semi-inclusive distribution of jets recoiling from a high-pT hadron. Charged-particle jet reconstruction is carried out using the anti-kT algorithm with R = 0.4. A data-driven statistical method is used to correct the recoil jet yield for uncorrelated background, including multi-partonic interactions. High-multiplicity (HM) pp events are selected based on charged-particle multiplicity registered in forward scintillator detectors, and their acoplanarity distributions are compared to those for Minimum Bias (MB) events. Significant broadening is observed in the acoplanarity distribution of HM events, consistent with jet quenching. However, qualitatively similar features are also seen in a simulated population of pp collisions generated by PYTHIA 8 Monash, which does not incorporate jet quenching. We utilize these PYTHIA simulations to explore the origin of the observed effect. The PYTHIA simulations suggest that the enhanced acoplanarity results from the bias induced by the HM selection towards multi-jet final states.

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

10304 - Nuclear physics

Projekt

<a href="/cs/project/LTT17018" target="_blank" >LTT17018: Získávání nových poznatků o mikrosvětě v infrastruktuře CERN</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2021

Kód důvěrnosti údajů

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

Název statě ve sborníku

Proceedings of Science

ISBN

—

ISSN

1824-8039

e-ISSN

—

Počet stran výsledku

5

Strana od-do

156

Název nakladatele

Sissa Medialab Srl

Místo vydání

Trieste

Místo konání akce

Austin

Datum konání akce

1. 6. 2020

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

—