REVIEW
A model of jet quenching in ultrarelativistic heavy ion collisions and high-pt hadron spectra at RHIC
High Energy Physics - Phenomenology · Submitted 19 Jun 2005 · 41 references
Pith's verdict: The released PYQUEN/HYDJET code is the real contribution; the RAA agreement is a fit restated, and the two extracted initial-condition parameters are not separately identifiable.
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Referee report
The paper
The paper claims
The paper presents a fast Monte Carlo that modifies ordinary proton-proton jet events with parton rescattering and energy loss in an expanding quark-gluon plasma, then checks whether the resulting model reproduces the main jet-quenching pat
The reading
What carries the argument
The load-bearing mechanism is an event-by-event parton cascade in which the probability of the next scattering is set by the local mean free path $��lambda=1/(��sigma��rho)$ in a Bjorken-expanding medium with $T(��tau)��tau^{1/3}=T_0��tau_0^{1/3}$. At each scattering the parton loses energy collisionally through high-momentum-transfer elastic scattering and radiates gluons according to the BDMS medium-induced spectrum, with a dead-cone suppression for heavy quarks and a parameterized angular distribution for the emitted gluons. The jet production vertex is distributed according to the nuclear overlap geometry, and the rescattering stops when the parton escapes, the medium cools to $T_c=200$ MeV, or the parton $p_T$ falls below $2T$. The modified partons and in-medium gluons are then fed into PYTHIA fragmentation, while a simple thermal-plus-collective-flow model generates the soft hadronic background.
Extended reading notes
Core claim
The paper's central claim is that a rescattering-by-rescattering Monte Carlo, built as a modification of PYTHIA and using BDMS radiative loss plus Bjorken collisional loss in a longitudinally expanding medium, can reproduce the main jet-quenching observables in central Au+Au collisions at $��sqrt{s_{NN}}=200$ GeV. With the initial temperature $T_0=500$ MeV, formation time $��tau_0=0.4$ fm/$c$, and $N_f=2$ active quark flavors, the authors report agreement with the PHENIX $p_T$ and centrality dependence of the neutral-pion nuclear modification factor $R_{AA}$, and with the STAR two-particle azimuthal correlation function $C(��Delta��phi)$, including the loss of the away-side peak. The paper presents this as a validated simulation method rather than a first-principles derivation of the medium properties.
Load-bearing premise
The load-bearing premise is that the initial temperature and formation time can be extracted from the same $R_{AA}$ data that the model is then said to reproduce, which assumes the hardest-$p_T$ suppression is governed by a single rescattering intensity rather than by several medium and jet parameters that can trade off against one another.
Editorial extensions
If this is right
- A fast generator of this kind can produce full heavy-ion events with both soft bulk and hard jets, making it usable for detector studies and signal estimates where a full hydrodynamic simulation would be too slow.
- Because the medium density rises with temperature and the model follows the expanding medium, the same setup predicts stronger jet quenching at the LHC than at RHIC, observable in $R_{AA}$ and dijet correlations.
- The event-by-event nuclear geometry naturally produces monojet-like configurations: a dijet vertex near the surface lets one jet escape while the other loses most of its energy, which is the paper's explanation for the missing away-side peak.
- The method gives a practical baseline for comparing cold nuclear matter with a hot quark-gluon plasma, since the same jet simulation can be run with and without the dense medium.
Reading between the lines
- The RHIC fit and the RHIC validation are not independent, so the model's LHC predictions should be read as conditional extrapolations; a parameter scan over $T_0$ and $��tau_0$ would show which observables break the degeneracy.
- The simple thermal-plus-flow soft sector is likely to limit quantitative use at low $p_T$ and in peripheral collisions, leaving high-$p_T$ jet observables as the method's natural domain.
- A useful next test would couple the same parton cascade to a more detailed fluid evolution or to a modern energy-loss formalism and check whether the tuned initial conditions survive.
- If the model holds, high-$p_T$ suppression and away-side correlations together could constrain the early temperature and formation time well enough to discriminate between different medium scenarios, even without a first-principles calculation.
Original abstract
The method to simulate the rescattering and energy loss of hard partons in ultrarelativistic heavy ion collisions has been developed. The model is a fast Monte-Carlo tool introduced to modify a standard PYTHIA jet event. The full heavy ion event is obtained as a superposition of a soft hydro-type state and hard multi-jets. The model is applied to analysis of the jet quenching pattern at RHIC.
The compiled record
The paper's own sentences, arranged, kept beside the review and separate from it. Each label is drawn from a closed vocabulary; the number beside it is the probability the classifier gave that label. Numbers in the tables are the authors', checked by code. No sentence in this record was written by a model.
The abstract, sentence by sentence
The method to simulate the rescattering and energy loss of hard partons in ultrarelativistic heavy ion collisions has been developed. The model is a fast Monte-Carlo tool introduced to modify a standard PYTHIA jet event. The full heavy ion event is obtained as a superposition of a soft hydro-type state and hard multi-jets. The model is applied to analysis of the jet quenching pattern at RHIC.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | The method to simulate the rescattering and energy loss of hard partons in ultrarelativistic heavy ion collisions has been developed. | method 0.55 | 0.85 | 0.09 | asserted 1.00 |
| s1 | The model is a fast Monte-Carlo tool introduced to modify a standard PYTHIA jet event. | method 0.98 | 0.80 | 0.05 | asserted 1.00 |
| s2 | The full heavy ion event is obtained as a superposition of a soft hydro-type state and hard multi-jets. | method 0.99 | 0.67 | 0.07 | asserted 1.00 |
| s3 | The model is applied to analysis of the jet quenching pattern at RHIC. | contribution 0.75 | 0.87 | 0.15 | asserted 0.99 |
What was examined, and what was not
- arXiv listing abstract v2
- full text
- figures and tables
- references and citing sentences
- relations to other papers
- P abstract
- S sections
- T body sentences
- C citations
- R cross-paper relations
Figures
Figures reproduced from arXiv:hep-ph/0506189 by the authors.
References
How later papers used it
131 later papers cite it
24 later papers by other authors are listed below: 24 used its method or tool.
Uses its method or tool 24 of 95 papers with this label
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Simulation of collisions is done by embedding 8 events into collision events produced with the generator (version 1.9) [ref] .
Fragmentation of jets containing a prompt J$/\psi$ meson in PbPb and pp collisions at $\sqrt{s_\mathrm{NN}} =$ 5.02 TeV (2021) · Simulation · 1.00
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Modified PYTHIA events for the isospin of the colliding nuclei as in this paper and embedded them in MinBias data.
Isolated photon production in $\sqrt{s_{NN}}$ = 2.76 TeV PbPb collisions as a function of transverse energy and reaction centrality (2011) · 1.00 · paraphrased: the licence does not allow quoting
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Studied jet-finding performance using dijets simulated with PYTHIA, modified for the isospin content of the colliding nuclei as in this paper.
Observation and studies of jet quenching in PbPb collisions at nucleon-nucleon center-of-mass energy = 2.76 TeV (2011) · 0.96 · paraphrased: the licence does not allow quoting
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For the $$ MC samples, each 8 event containing a $$ baryon is embedded into a $$ collision event generated with $$ 1.8 [ref] , which is tuned to reproduce global event properties such as the charged-hadron $$ spectrum and particle multiplicity.
Production of $\Lambda_\mathrm{c}^+$ baryons in proton-proton and lead-lead collisions at $\sqrt{s_\mathrm{NN}} =$ 5.02 TeV (2019) · Event reconstruction and simulated samples · 1.00
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Embedded photon events into background events generated using this paper's version 1.8 to model the underlying PbPb events.
Studies of jet quenching using isolated-photon + jet correlations in PbPb and pp collisions at sqrt(s[NN]) = 2.76 TeV (2012) · 0.99 · paraphrased: the licence does not allow quoting
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The corrections are derived using simulated dijet and photon+jet events generated with the 8.212 [ref] (CUETP8M1 tune [ref] ) Monte Carlo (MC) event generator which, for the case of corrections, are embedded into a simulated underlying background event from 1.9 [ref] .
Study of jet quenching with isolated-photon+jet correlations in PbPb and pp collisions at $\sqrt{s_{_{\mathrm{NN}}}} =$ 5.02 TeV (2017) · Jet reconstruction · 0.99
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Embedded its events into fully simulated PbPb events generated by this paper's version 1.8 to account for the underlying PbPb event.
Decomposing transverse momentum balance contributions for quenched jets in PbPb collisions at sqrt(s[NN]) = 2.76 TeV (2016) · 0.99 · paraphrased: the licence does not allow quoting
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Compared a W signal simulation embedded in PbPb events generated with this paper's Hydjet to the data.
W, Z and photon production in CMS (2012) · 0.84 · paraphrased: the licence does not allow quoting
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Corrected the data for detector acceptance and inefficiencies using correction factors estimated from this paper's hydjet 1.8.
Measurement of the pseudorapidity and centrality dependence of the transverse energy density in PbPb collisions at sqrt(s[NN]) = 2.76 TeV (2012) · 1.00 · paraphrased: the licence does not allow quoting
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Simulated the three states with PYTHIA and embedded them in PbPb events simulated with this paper's version 1.8 to correct yields.
Suppression of Upsilon(1S), Upsilon(2S), and Upsilon(3S) production in PbPb collisions at sqrt(s[NN]) = 2.76 TeV (2016) · 1.00 · paraphrased: the licence does not allow quoting
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Embedded dijet events into both real data and simulated data using this paper's hydjet generator to simulate heavy-ion underlying event effects.
Studies of Jet Quenching in PbPb collisions at CMS (2011) · 0.99 · paraphrased: the licence does not allow quoting
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Created a sample by embedding signal events in heavy ion events generated with this paper's version 1.9.
Study of jet quenching with Z+jet correlations in PbPb and pp collisions at sqrt(s[NN]) = 5.02 TeV (2017) · 0.99 · paraphrased: the licence does not allow quoting
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At the step of detector digitization, each hard scattering event is placed at the same primary-vertex [ref] location as a heavy ion background event generated with (v1.9) [ref] , to mimic the effects of the UE without any QGP-induced modifications of the final-state particles from the top quark decay.
Evidence for top quark production in nucleus-nucleus collisions (2020) · Introduction · 0.98
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Studied quenching effects using both QPYTHIA and this paper's PYQUEN.
Jet Reconstruction in Heavy Ion Collisions (2010) · 1.00 · paraphrased: the licence does not allow quoting
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Embedded PYTHIA6 interactions into simulated minimum-bias PbPb events produced with this paper's HYDJET version 1.383.
Studies of Quark and Gluon Contributions to Jets using Jet Charge Measurements in pp and PbPb Collisions (2020) · 1.00 · paraphrased: the licence does not allow quoting
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In the case, samples are created by overlapping and signal events with minimum bias (MB) heavy ion events generated with the 1.9 MC event generator [ref] .
Using Z boson events to study parton-medium interactions in PbPb collisions (2021) · Introduction · 1.00
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Embedded its events into fully simulated PbPb events generated by this paper's version 1.8 to account for the underlying PbPb events.
Correlations between jets and charged particles in PbPb and pp collisions at sqrt(s[NN]) = 2.76 TeV (2016) · 0.99 · paraphrased: the licence does not allow quoting
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Tested the track-weighting procedure using MC events generated with this paper's HYDJET version 1.6 propagated through a full detector simulation.
Centrality dependence of dihadron correlations and azimuthal anisotropy harmonics in PbPb collisions at sqrt(s[NN]) = 2.76 TeV (2012) · 0.97 · paraphrased: the licence does not allow quoting
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Embedded simulated Upsilon decays in PbPb events simulated with this paper's hydjet to consider the higher PbPb underlying event activity.
Suppression of Upsilon excited states in PbPb collisions at a nucleon-nucleon centre-of-mass energy of 2.76 TeV (2011) · 1.00 · paraphrased: the licence does not allow quoting
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Generated the underlying event for both Jewel and LBT using this paper's hydjet 1.9.
Automated Discovery of Jet Substructure Analyses (2018) · 1.00 · paraphrased: the licence does not allow quoting
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The simulated events are generated using 8.212 [ref] , tune CP5 [ref] , and embedded into MC events from 1.9 [ref] .
Probing charm quark dynamics via multiparticle correlations in PbPb collisions at $\sqrt{s_\mathrm{NN}} =$ 5.02 TeV (2021) · Introduction · 1.00
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Embedded events into PbPb events produced by this paper's hydjet generator version 1.8 to compare with PbPb data.
Evidence of b-jet quenching in PbPb collisions at sqrt(s[NN]) = 2.76 TeV (2013) · 0.99 · paraphrased: the licence does not allow quoting
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Simulated minimum bias events with this paper's event generator version 1.8 to model the PbPb background.
Jet momentum dependence of jet quenching in PbPb collisions at sqrt(sNN)=2.76 TeV (2012) · 0.98 · paraphrased: the licence does not allow quoting
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For the MC samples, each $8$ event containing a baryon is embedded into a collision event generated with $$ 1.9 [ref] , which is tuned to reproduce global event properties such as the charged-hadron spectrum and particle multiplicity.
Study of charm hadronization with prompt $\Lambda^+_\mathrm{c}$ baryons in proton-proton and lead-lead collisions at $\sqrt{s_\mathrm{NN}}$ = 5.02 TeV (2023) · Event selection and simulated event sample · 1.00
How the literature uses it
122 arXiv papers cite this in 149 sentences
Papers citing it · 31 sentences without a confident label
Uses its method or tool 90 papers
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Jets including quenching effects have been generated using Pyquen [ref] , v1.5.1, as included in Hydjet [ref] .
Jet Fragmentation Function Moments in Heavy Ion Collisions · Simulation and reconstruction tools · 1.00
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In this framework, the soft thermal component is simulated using the FAST MC generator [ref] , while the hard component is modeled with the PYQUEN event generator, which incorporates parton energy loss [ref] .
Study of anisotropic flow of heavy hadrons in Au + Au collisions at $\sqrt{s_{NN}} =$ 200 GeV using HYDJET++ framework · Introduction · 0.98
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Simulation of collisions is done by embedding 8 events into collision events produced with the generator (version 1.9) [ref] .
Fragmentation of jets containing a prompt J$/\psi$ meson in PbPb and pp collisions at $\sqrt{s_\mathrm{NN}} =$ 5.02 TeV · Simulation · 1.00
Compares with it 3 papers
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The results are compared to a measurement by the ALICE Collaboration [ref] and to predictions from the v3400 [ref] , 1.9 [ref] , and 1.26t5 [ref] event generators.
Pseudorapidity distributions of charged hadrons in xenon-xenon collisions at $\sqrt{s_\mathrm{NN}} =$ 5.44 TeV · Introduction · 1.00
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In order to address the sensitivity to modifications of the $A_J$ distributions that might be expected at RHIC here we compare simulations with those from [ref] (a jet quenching parton shower model with parameters tuned to RHIC data).
An Upgrade Proposal from the PHENIX Collaboration · Dijets in collisions · 0.95
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Also shown in Fig. [ref] are predictions from the [ref] (v2.2.0) and [ref] (v1.5.4) generators.
First measurement of large area jet transverse momentum spectra in heavy-ion collisions · Results · 0.95
Cites it as background 11 papers
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Several implementations of in-medium parton showers have been proposed in the literature [ref] .
Isolating perturbative QCD splittings in heavy-ion collisions · Introduction · 0.81
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Based on these experimental data, lots of studies on properties of hadronic $p_T$ distribution are carried out, which greatly improve people's understandings on property of the created hot nuclear matter and the mechanism of hadron production in relativistic heavy-ion collisions [ref] .
Averaged transverse momentum correlations of hadrons in relativistic heavy-ion collisions · Introduction · 0.81
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In a heavy ion context, theoretical discussion as to how the fragmentation function could be expected to be modified by the medium were put forward, for instance, in [ref] , and the question can be examined also with the help of Monte Carlo programs that simulate jet fragmentation in a medium [ref] .
Jet Fragmentation Function Moments in Heavy Ion Collisions · Introduction · 0.93
Discussion
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