Measurement of inclusive and leading subjet fragmentation in pp and Pb-Pb collisions at root sNN=5.02 TeV

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F23%3A00368617" target="_blank" >RIV/68407700:21340/23:00368617 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1007/JHEP05(2023)245" target="_blank" >https://doi.org/10.1007/JHEP05(2023)245</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/JHEP05(2023)245" target="_blank" >10.1007/JHEP05(2023)245</a>

Result language

angličtina

Original language name

Measurement of inclusive and leading subjet fragmentation in pp and Pb-Pb collisions at root sNN=5.02 TeV

Original language description

This article presents new measurements of the fragmentation properties of jets in both proton-proton (pp) and heavy-ion collisions with the ALICE experiment at the Large Hadron Collider (LHC). We report distributions of the fraction z(r) of transverse momentum carried by subjets of radius r within jets of radius R. Charged-particle jets are reconstructed at midrapidity using the anti-k(T) algorithm with jet radius R = 0.4, and subjets are reconstructed by reclustering the jet constituents using the anti-k(T) algorithm with radii r = 0.1 and r = 0.2. In proton-proton collisions, we measure both the inclusive and leading subjet distributions. We compare these measurements to perturbative calculations at next-to-leading logarithmic accuracy, which suggest a large impact of threshold resummation and hadronization effects on the z(r) distribution. In heavy-ion collisions, we measure the leading subjet distributions, which allow access to a region of harder jet frag- mentation than has been probed by previous measurements of jet quenching via hadron fragmentation distributions. The z(r) distributions enable extraction of the parton-to-subjet fragmentation function and allow for tests of the universality of jet fragmentation functions in the quark-gluon plasma (QGP). We find no significant modification of z(r) distributions in Pb-Pb compared to pp collisions. However, the distributions are also consistent with a hardening trend for z(r)< 0.95, as predicted by several jet quenching models. As z(r) -> 1 our results indicate that any such hardening effects cease, exposing qualitatively new possibilities to disentangle competing jet quenching mechanisms. By comparing our results to theoretical calculations based on an independent extraction of the parton-to-jet fragmentation function, we find consistency with the universality of jet fragmentation and no indication of factorization breaking in the QGP.

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)<br>S - Specificky vyzkum na vysokych skolach

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

5

Country of publishing house

IT - ITALY

Number of pages

34

Pages from-to

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UT code for WoS article

001022895100001

EID of the result in the Scopus database

2-s2.0-85161037786