Measurements of the suppression and correlations of dijets in Pb+Pb collisions at sNN = 5.02 TeV

The ATLAS collaboration
Phys.Rev.C 107 (2023) 054908, 2023.

Abstract (data abstract)
Studies of the correlations of the two highest transverse momentum (leading)jets in individual Pb+Pb collision events can provide information about themechanism of jet quenching by the hot and dense matter created in suchcollisions. In Pb+Pb and pp collisions at sNN = 5.02TeV, measurements of the leading dijet transverse momentum (pT)correlations are presented. Additionally, measurements in Pb+Pb collisions ofthe dijet pair nuclear modification factors projected along leading andsubleading jet pT are made. The measurements are performed usingthe ATLAS detector at the LHC with 260 pb1 of pp datacollected in 2017 and 2.2 nb1 of Pb+Pb data collected in2015 and 2018. An unfolding procedure is applied to the two-dimensionalleading and subleading jet pT distributions to account forexperimental effects in the measurement of both jets. Results are provided fordijets with leading jet pT greater than 100 GeV. Measurements ofthe dijet-yield-normalized xJ distributions in Pb+Pb collisionsshow an increased fraction of imbalanced jets compared to pp collisions;these measurements are in agreement with previous measurements of the samequantity at 2.76 TeV in the overlapping kinematic range. Measurements of theabsolutely-normalized dijet rate in Pb+Pb and pp collisions are alsopresented, and show that balanced dijets are significantly more suppressedthan imbalanced dijets in Pb+Pb collisions. It is observed in themeasurements of the pair nuclear modification factors that the subleadingjets are significantly suppressed relative to leading jets withpT between 100 and 316 GeV for all centralities in Pb+Pbcollisions.

  • pp abs norm

    Figs. 11, 12, Aux. Fig. 3

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    absolutely normalized dijet cross sections from pp collisions

  • PbPb abs norm cent0

    Figs. 11, 12, Aux. Fig. 3

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    absolutely normalized dijet yields scaled by 1/ in 0-10% central PbPb collisions

  • PbPb abs norm cent1

    Figs. 11, 12, Aux. Fig. 3

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    absolutely normalized dijet yields scaled by 1/ in 10-20% central PbPb collisions

  • PbPb abs norm cent2

    Figs. 11, 12, Aux. Fig. 3

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    absolutely normalized dijet yields scaled by 1/ in 20-40% central PbPb collisions

  • PbPb abs norm cent3

    Figs. 11, 12, Aux. Fig. 3

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    absolutely normalized dijet yields scaled by 1/ in 40-60% central PbPb collisions

  • PbPb abs norm cent4

    Figs. 11, 12, Aux. Fig. 3

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    absolutely normalized dijet yields scaled by 1/ in 60-80% central PbPb collisions

  • pp self norm

    Figs. 7, 8, Aux Fig. 1

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    self normalized dijets from pp collisions

  • PbPb self norm cent0

    Fig. 13

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    self normalized dijet distributions in 0-10% central PbPb collisions

  • PbPb self norm cent1

    Aux. Fig. 4

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    self normalized dijet distributions in 10-20% central PbPb collisions

  • PbPb self norm cent2

    Fig. 13

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    self normalized dijet distributions in 20-40% central PbPb collisions

  • PbPb self norm cent3

    Aux. Fig. 4

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    self normalized dijet distributions in 40-60% central PbPb collisions

  • PbPb self norm cent4

    Fig. 13

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    self normalized dijet distributions in 60-80% central PbPb collisions

  • PbPb leading RAA0

    Example location

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    leading jet RAA^pair in 0-10% central PbPb collisions

  • PbPb subleading RAA0

    Example location

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    subleading jet RAA^pair in 0-10% central PbPb collisions

  • PbPb leading RAA1

    Example location

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    leading jet RAA^pair in 10-20% central PbPb collisions

  • PbPb subleading RAA1

    Example location

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    subleading jet RAA^pair in 10-20% central PbPb collisions

  • PbPb leading RAA2

    Example location

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    leading jet RAA^pair in 20-40% central PbPb collisions

  • PbPb subleading RAA2

    Example location

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    subleading jet RAA^pair in 20-40% central PbPb collisions

  • PbPb leading RAA3

    Example location

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    leading jet RAA^pair in 40-60% central PbPb collisions

  • PbPb subleading RAA3

    Example location

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    subleading jet RAA^pair in 40-60% central PbPb collisions

  • PbPb leading RAA4

    Example location

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    leading jet RAA^pair in 60-80% central PbPb collisions

  • PbPb subleading RAA4

    Example location

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    subleading jet RAA^pair in 60-80% central PbPb collisions

  • raa_ratio

    Fig. 14

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    ratio of subleading jet RAA^pair to leading jet RAA^pair in PbPb collisions

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