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Measurement of the radius dependence of charged-particle jet suppression in Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV
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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.
Forward citations
Cited by 5 Pith papers
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Measurement of forward jet suppression in Pb+Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$$ TeV with the ATLAS detector
First measurement of jet suppression at forward rapidity in heavy-ion collisions shows strong centrality-dependent suppression of jet yields.
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An Equilibrating Parton Shower for Jet Quenching and Medium Response
A parton shower derived from QCD effective kinetic theory reproduces the full linearized Boltzmann equation and generates jet wakes, Mach-cone-like structures, and two-particle correlations.
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An improved linear Boltzmann transport model for hadron and jet suppression in ultrarelativistic heavy-ion collisions
An improved LBT model with an earlier medium-scale insertion and color-flow tracking reproduces hadron and jet nuclear modification factors together in 5.02 TeV Pb+Pb collisions.
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Neural network biased corrections: Cautionary study in background corrections for quenched jets
Neural network jet background corrections trained on unquenched jets are systematically biased for quenched jets, causing simulated RAA measurements to be up to 47% too low.
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Towards factorization of jet observables in dense media : An EFT approach
A review of the SCET plus Glauber open quantum system framework for factorizing medium-modified jet observables, using projected nu-point energy correlators as the worked example.
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