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

Result code in 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>

Alternative codes found

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

Result on the web

<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>

Result language

angličtina

Original language name

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

Original language description

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.

Czech name

—

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

—

OECD FORD branch

10304 - Nuclear physics

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2025

Confidentiality

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

Name of the periodical

Physics Letters. B

ISSN

0370-2693

e-ISSN

1873-2445

Volume of the periodical

864

Issue of the periodical within the volume

May

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

13

Pages from-to

139409

UT code for WoS article

001494307700001

EID of the result in the Scopus database

2-s2.0-105001955005