Medium-induced modification of groomed and ungroomed jet mass and angularities in Pb-Pb collisions at √sNN=5.02 TeV

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F25%3A00636608" target="_blank" >RIV/61389005:_____/25:00636608 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68378271:_____/25:00636608 RIV/68407700:21340/25:00386666

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0370269325001698" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0370269325001698</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.physletb.2025.139409" target="_blank" >10.1016/j.physletb.2025.139409</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Medium-induced modification of groomed and ungroomed jet mass and angularities in Pb-Pb collisions at √sNN=5.02 TeV

Popis výsledku v původním jazyce

The ALICE Collaboration presents a new suite of jet substructure measurements in Pb-Pb and pp collisions at a center-of-mass energy per nucleon pair root s(NN) = 5.02 TeV. These measurements provide access to the internal structure of jets via the momentum and angle of their constituents, probing how the quark-gluon plasma modifies jets, an effect known as jet quenching. Jet grooming additionally removes soft wide-angle radiation to enhance perturbative accuracy and reduce experimental uncertainties. We report the groomed and ungroomed jet mass m(jet) and jet angularities lambda(kappa)(alpha) using kappa = 1 and alpha > 0. Charged-particle jets are reconstructed at midrapidity using the anti-k(T) algorithm with resolution parameter R = 0.2. A narrowing of the jet mass and angularity distributions in Pb-Pb collisions with respect to pp is observed and is enhanced for groomed results, confirming modification of the jet core. By using consistent jet definitions and kinematic cuts between the mass and angularities for the first time, previous inconsistencies in the interpretation of quenching measurements are resolved, rectifying a hurdle for understanding how jet quenching arises from first principles and highlighting the importance of a well-controlled baseline. These results are compared with a variety of theoretical models of jet quenching, providing constraints on jet energy-loss mechanisms in the quark-gluon plasma.

Název v anglickém jazyce

Medium-induced modification of groomed and ungroomed jet mass and angularities in Pb-Pb collisions at √sNN=5.02 TeV

Popis výsledku anglicky

The ALICE Collaboration presents a new suite of jet substructure measurements in Pb-Pb and pp collisions at a center-of-mass energy per nucleon pair root s(NN) = 5.02 TeV. These measurements provide access to the internal structure of jets via the momentum and angle of their constituents, probing how the quark-gluon plasma modifies jets, an effect known as jet quenching. Jet grooming additionally removes soft wide-angle radiation to enhance perturbative accuracy and reduce experimental uncertainties. We report the groomed and ungroomed jet mass m(jet) and jet angularities lambda(kappa)(alpha) using kappa = 1 and alpha > 0. Charged-particle jets are reconstructed at midrapidity using the anti-k(T) algorithm with resolution parameter R = 0.2. A narrowing of the jet mass and angularity distributions in Pb-Pb collisions with respect to pp is observed and is enhanced for groomed results, confirming modification of the jet core. By using consistent jet definitions and kinematic cuts between the mass and angularities for the first time, previous inconsistencies in the interpretation of quenching measurements are resolved, rectifying a hurdle for understanding how jet quenching arises from first principles and highlighting the importance of a well-controlled baseline. These results are compared with a variety of theoretical models of jet quenching, providing constraints on jet energy-loss mechanisms in the quark-gluon plasma.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10304 - Nuclear physics

Projekt

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

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

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

Název periodika

Physics Letters. B

ISSN

0370-2693

e-ISSN

1873-2445

Svazek periodika

864

Číslo periodika v rámci svazku

May

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

13

Strana od-do

139409

Kód UT WoS článku

001494307700001

EID výsledku v databázi Scopus

2-s2.0-105001955005