Name: Measurement of the radius dependence of charged-particle jet suppression in Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV
Creator: ALICE Collaboration
Published: 2024

Abstract

The ALICE Collaboration reports a differential measurement of inclusive jet suppression using pp and Pb$-$Pb collision data at a center-of-mass energy per nucleon-nucleon collision $\sqrt{s_{\rm NN}} = 5.02$ TeV. Charged-particle jets are reconstructed using the anti-$k_{\rm T}$ algorithm with resolution parameters $R =$ 0.2, 0.3, 0.4, 0.5, and 0.6 in pp collisions and $R =$ 0.2, 0.4, 0.6 in central (0$-$10%), semi-central (30$-$50%), and peripheral (60$-$80%) Pb$-$Pb collisions. A novel approach based on machine learning is employed to mitigate the influence of jet background. This enables measurements of inclusive jet suppression in new regions of phase space, including down to the lowest jet $p_{\rm T} \geq 40$ GeV/$c$ at $R = 0.6$ in central Pb$-$Pb collisions. This is an important step for discriminating different models of jet quenching in the quark-gluon plasma. The transverse momentum spectra, nuclear modification factors, derived cross section, and nuclear modification factor ratios for different jet resolution parameters of charged-particle jets are presented and compared to model predictions. A mild dependence of the nuclear modification factor ratios on collision centrality and resolution parameter is observed. The results are compared to a variety of jet-quenching models with varying levels of agreement.

Figure 1a

Data from Figure 1 (left), located on page 7.

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delta pT distributions for ML and AB methods in central collisions with R = 0.4.
Figure 1b

Data from Figure 1 (right), located on page 7.

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Summary of standard deviation of delta pT distributions for ML and AB methods in central and semi-central collisions as a...
Figure 2a

Data from Figure 2 (left), located on page 11.

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Raa toy distributions for charged jets as a function of jet pT for fractional in cone, fractional out of cone,...
Figure 2b top

Data from Figure 2 (top right), located on page 11.

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Fragmentation modification ratios for charged jets for high pT for the different toy modifications.
Figure 2b bottom

Data from Figure 2 (right), located on page 11.

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Fragmentation modification ratios for charged jets for low pT for the different toy modifications.
Figure 3a top R020

Data from Figure 3 (top left) R = 0.2 points, located on page 15.

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Jet production spectra in 0--10% collisions with R = 0.2
Figure 3a top R040

Data from Figure 3 (top left) R = 0.4 points, located on page 15.

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Jet production spectra in 0--10% collisions with R = 0.4
Figure 3a top R060

Data from Figure 3 (top left) R = 0.6 points, located on page 15.

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Jet production spectra in 0--10% collisions with R = 0.6
Figure 3b top R020

Data from Figure 3 (top right) R = 0.2 points, located on page 15.

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Jet production spectra in 30--50% collisions with R = 0.2
Figure 3b top R040

Data from Figure 3 (top right) R = 0.4 points, located on page 15.

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Jet production spectra in 30--50% collisions with R = 0.4
Figure 3b top R060

Data from Figure 3 (top right) R = 0.6 points, located on page 15.

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Jet production spectra in 30--50% collisions with R = 0.6
Figure 3a bottom

Data from Figure 3 (bottom left), located on page 15.

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Jet production spectra in 60--80% collisions
Figure 3b bottom

Data from Figure 3 (bottom right), located on page 15.

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Jet production spectra in pp collisions
Figure 4a top ML

Data from Figure 4 (top left), located on page 16.

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Nuclear modification factor for jets with R = 0.2 in central collisions with ML-based subtraction
Figure 4a top AB

Data from Figure 4 (top left), located on page 16.

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Nuclear modification factor for jets with R = 0.2 in central collisions with AB subtraction
Figure 4b top AB

Data from Figure 4 (top middle), located on page 16.

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Nuclear modification factor for jets with R = 0.4 in central collisions with AB subtraction
Figure 4b top ML

Data from Figure 4 (top middle), located on page 16.

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Nuclear modification factor for jets with R = 0.4 in central collisions with ML subtraction
Figure 4c top ML

Data from Figure 4 (top right), located on page 16.

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Nuclear modification factor for jets with R = 0.6 in central collisions with ML subtraction
Figure 4a middle ML

Data from Figure 4 (middle left), located on page 16.

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Nuclear modification factor for jets with R = 0.2 in semicentral collisions with ML-based subtraction
Figure 4a middle AB

Data from Figure 4 (middle left), located on page 16.

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Nuclear modification factor for jets with R = 0.2 in semicentral collisions with AB subtraction
Figure 4b middle ML

Data from Figure 4 (middle middle), located on page 16.

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Nuclear modification factor for jets with R = 0.4 in semicentral collisions with ML-based subtraction
Figure 4b middle AB

Data from Figure 4 (middle middle), located on page 16.

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Nuclear modification factor for jets with R = 0.4 in semicentral collisions with AB subtraction
Figure 4c middle AB

Data from Figure 4 (middle right), located on page 16.

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Nuclear modification factor for jets with R = 0.6 in semicentral collisions with AB subtraction
Figure 4a bottom AB

Data from Figure 4 (bottom left), located on page 16.

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Nuclear modification factor for jets with R = 0.2 in peripheral collisions with AB subtraction
Figure 4b bottom AB

Data from Figure 4 (bottom middle), located on page 16.

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Nuclear modification factor for jets with R = 0.4 in peripheral collisions with AB subtraction
Figure 4c bottom AB

Data from Figure 4 (bottom right), located on page 16.

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Nuclear modification factor for jets with R = 0.6 in peripheral collisions with AB subtraction
Figure 7a pp

Data from Figure 7 (left), located on page 19.

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Cross Section ratios for pp
Figure 7a PbPb Central

Data from Figure 7 (left), located on page 19.

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Cross Section ratios for PbPb (central)
Figure 7a PbPb Semi Central

Data from Figure 7 (left), located on page 19.

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Cross Section ratios for PbPb (semi central)
Figure 7b pp

Data from Figure 7 (right), located on page 19.

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Cross Section ratios for pp
Figure 7b PbPb Central

Data from Figure 7 (right), located on page 19.

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Cross Section ratios for PbPb (central)
Figure 7b PbPb Semi Central

Data from Figure 7 (left), located on page 19.

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Cross Section ratios for PbPb (semi central)
Figure 8 top left

Data from Figure 8 (top left), located on page 20.

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Raa Ratio for R = 0.4/R = 0.2, PbPb, Central
Figure 8 top right

Data from Figure 8 (top right), located on page 20.

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Raa Ratio for R = 0.6/R = 0.2, PbPb, Central
Figure 8 bottom left

Data from Figure 8 (bottom left), located on page 20.

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Raa Ratio for R = 0.4/R = 0.2, PbPb, SemiCentral
Figure 8 bottom right

Data from Figure 8 (bottom right), located on page 20.

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Raa Ratio for R = 0.6/R = 0.2, PbPb, SemiCentral

Figure 1a

Figure 1b

Figure 2a

Figure 2b top

Figure 2b bottom

Figure 3a top R020

Figure 3a top R040

Figure 3a top R060

Figure 3b top R020

Figure 3b top R040

Figure 3b top R060

Figure 3a bottom

Figure 3b bottom

Figure 4a top ML

Figure 4a top AB

Figure 4b top AB

Figure 4b top ML

Figure 4c top ML

Figure 4a middle ML

Figure 4a middle AB

Figure 4b middle ML

Figure 4b middle AB

Figure 4c middle AB

Figure 4a bottom AB

Figure 4b bottom AB

Figure 4c bottom AB

Figure 7a pp

Figure 7a PbPb Central

Figure 7a PbPb Semi Central

Figure 7b pp

Figure 7b PbPb Central

Figure 7b PbPb Semi Central

Figure 8 top left

Figure 8 top right

Figure 8 bottom left

Figure 8 bottom right

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