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Inclusive jet and hadron suppression in a multistage approach
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abstract
We present a new study of jet interactions in the quark-gluon plasma created in high-energy heavy-ion collisions, using a multistage event generator within the JETSCAPE framework. We focus on medium-induced modifications in the rate of inclusive jets and high transverse momentum (high-$p_{\mathrm{T}}$) hadrons. Scattering-induced jet energy loss is calculated in two stages: A high virtuality stage based on the MATTER model, in which scattering of highly virtual partons modifies the vacuum radiation pattern, and a second stage at lower jet virtuality based on the LBT model, in which leading partons gain and lose virtuality by scattering and radiation. Coherence effects that reduce the medium-induced emission rate in the MATTER phase are also included. The TRENTo model is used for initial conditions, and the (2+1)dimensional VISHNU model is used for viscous hydrodynamic evolution. Jet interactions with the medium are modeled via 2-to-2 scattering with Debye screened potentials, in which the recoiling partons are tracked, hadronized, and included in the jet clustering. Holes left in the medium are also tracked and subtracted to conserve transverse momentum. Calculations of the nuclear modification factor ($R_{\mathrm{AA}}$) for inclusive jets and high-$p_{\mathrm{T}}$ hadrons are compared to experimental measurements at the BNL Relativistic Heavy Ion Collider (RHIC) and the CERN Large Hadron Collider (LHC). Within this framework, we find that with one extra parameter which codifies the transition between stages of jet modification -- along with the typical parameters such as the coupling in the medium, the start and stop criteria etc. -- we can describe these data at all energies for central and semicentral collisions without a rescaling of the jet transport coefficient $\hat{q}$.
Forward citations
Cited by 13 Pith papers
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Bremsstrahlung photon contributions to parton energy loss at high virtuality ($Q^2$) : a perturbative calculation at $O(\alpha_{s} \alpha_{em})$
A first perturbative derivation of medium-induced photon bremsstrahlung kernels at O(alpha_s alpha_em) from high-virtuality quarks, with heavy quark masses and fermion-boson conversion.
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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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Energy loss and theoretical uncertainties in small quark-gluon plasmas
A pQCD energy loss model with short-pathlength corrections shows the large formation time approximation fails self-consistently and, after a one-parameter fit, describes RHIC small systems while failing LHC small systems.
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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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Hybrid Hadronization -- A Study of In-Medium Hadronization of Jets
Hybrid Hadronization converts a substantial part of jet fragmentation in a QGP brick into shower-thermal recombination, which grows with medium size, carries collective flow, and boosts baryon/meson ratios.
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Modified Coherence and the Transverse Extent of Jets
Using wave-packets and a modified parton shower, the authors show that jets are transversely broad and derive a gluon-TMDPDF-based relation in which the jet transport coefficient qhat weakens with increasing parton vi...
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Hard Photon Triggered Jets in $p$-$p$ and $A$-$A$ Collisions
The multistage JETSCAPE model postdicts photon-triggered jet suppression and correlations at RHIC and LHC when bremsstrahlung photons are included, without any new parameter tuning.
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Interplay of prompt and non-prompt photons in photon-triggered jet observables
Including isolated non-prompt (bremsstrahlung) photons in JETSCAPE simulations improves agreement with measured photon-jet asymmetry and azimuthal correlations in pp and Pb-Pb collisions at 5.02 TeV.
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Extraction of jet-medium interaction details through jet substructure for inclusive and gamma-tagged jets
In JETSCAPE simulations, gamma-tagged jets reveal a genuine medium-induced broadening of quark-jet hard splittings, while the narrowing seen for inclusive jets is largely a selection bias from energy loss.
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Probing medium response via strangeness enhancement around quenched jets
In the AMPT model, jet-induced medium excitation enhances the strange-to-non-strange hadron ratio around quenched jets in Pb+Pb collisions, increasing with centrality and radial distance.
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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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Jet Modification and Medium Response -- Theory Overview
A theory overview concludes that medium response, evidenced by a depletion on the Z side of Z-hadron events, may now be experimentally visible in heavy-ion collisions.
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Jet and jet substructure: ALICE results
A review of recent ALICE jet and jet-substructure measurements, showing where data agree and disagree with Monte Carlo and pQCD predictions.
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