Measurement of substructure-dependent jet suppression in <math><mrow><mi>Pb</mi><mo>+</mo><mi>Pb</mi></mrow></math> collisions at 5.02 TeV with the ATLAS detector

Aad, Georges; Abbott, Braden Keim; Abbott, D.C.; Abeling, Kira; Abidi, Haider; Aboulhorma, Asmaa; Abramowicz, Halina; Abreu, Henso; Abulaiti, Yiming; Abusleme Hoffman, A.C.

doi:10.1103/PhysRevC.107.054909

Measurement of substructure-dependent jet suppression in $Pb + Pb$ collisions at 5.02 TeV with the ATLAS detector

ATLAS

Collaboration

Nov 21, 2022

32 pages

Published in:

Phys.Rev.C 107 (2023) 5, 054909

Published: May 12, 2023

e-Print:

2211.11470 [nucl-ex]

DOI:

10.1103/PhysRevC.107.054909 (publication)

Report number:

CERN-EP-2022-182

Experiments:

CERN-LHC-ATLAS

View in:

reference search45 citations

Citations per year

Abstract: (APS)

The ATLAS detector at the Large Hadron Collider has been used to measure jet substructure modification and suppression in

Pb + Pb

collisions at a nucleon–nucleon center-of-mass energy

\sqrt{s_{_{N N}}} = 5.02 TeV

in comparison with proton–proton (

p p

) collisions at

\sqrt{s} = 5.02 TeV

. The

Pb + Pb

data, collected in 2018, have an integrated luminosity of

1.72 {nb}^{- 1}

, while the

p p

data, collected in 2017, have an integrated luminosity of

260 {pb}^{- 1}

. Jets used in this analysis are clustered using the anti-

k_{t}

algorithm with a radius parameter

R = 0.4

. The jet constituents, defined by both tracking and calorimeter information, are used to determine the angular scale

r_{g}

of the first hard splitting inside the jet by reclustering them using the Cambridge–Aachen algorithm and employing the soft-drop grooming technique. The nuclear modification factor,

R_{A A}

, used to characterize jet suppression in

Pb + Pb

collisions, is presented differentially in

r_{g}

, jet transverse momentum, and in intervals of collision centrality. The

R_{A A}

value is observed to depend significantly on jet

r_{g}

. Jets produced with the largest measured

r_{g}

are found to be twice as suppressed as those with the smallest

r_{g}

in central

Pb + Pb

collisions. The

R_{A A}

values do not exhibit a strong variation with jet

p_{T}

in any of the

r_{g}

intervals. The

r_{g}

and

p_{T}

dependence of jet

R_{A A}

is qualitatively consistent with a picture of jet quenching arising from coherence and provides the most direct evidence in support of this approach.

Note:

All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HION-2021-09/

jet: suppression
jet: transverse momentum
p p: scattering
jet: quenching
TeV
interpretation of experiments: ATLAS
coherence
splitting
nucleon nucleon
interpretation of experiments: CERN LHC Coll

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Measurement of substructure-dependent jet suppression in Pb+Pb collisions at 5.02 TeV with the ATLAS detector

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Measurement of substructure-dependent jet suppression in $Pb + Pb$ collisions at 5.02 TeV with the ATLAS detector