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A derivation of the source term induced by a fast parton from the quark energy-momentum tensor
High Energy Physics - Phenomenology · Submitted 17 May 2011
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim In particular, one would be less likely to observe a conical emission pattern for increasing trigger pT.
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The abstract, sentence by sentence
The distribution of energy and momentum deposited by a fast parton in a medium of thermalized quarks, or the source term, is evaluated in perturbative thermal field theory. The calculation is performed by directly evaluating the thermal expectation value of the quark energy-momentum tensor. The fast parton is coupled to the medium by adding an interaction term to the Lagrangian. I show that this approach is very general and can be modified to consider more realistic modeling of fast parton propagation, such as a fast parton created in an initial hard interaction or the evolution of a parton shower due to medium induced radiation. For the scenario considered here, it is found that local excitations fall sharply as a function of the energy of the fast parton. These local excitations couple directly to the sound mode in hydrodynamics and are important for generating an observable shockwave structure. This may have implications for the trigger pT dependence of measurements of azimuthal dihadron particle correlations in heavy-ion collisions. In particular, one would be less likely to observe a conical emission pattern for increasing trigger pT.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | The distribution of energy and momentum deposited by a fast parton in a medium of thermalized quarks, or the source term, is evaluated in perturbative thermal field theory. | contribution 0.97 | 0.89 | 0.12 | asserted 1.00 |
| s1 | The calculation is performed by directly evaluating the thermal expectation value of the quark energy-momentum tensor. | method 1.00 | 0.92 | 0.04 | asserted 1.00 |
| s2 | The fast parton is coupled to the medium by adding an interaction term to the Lagrangian. | method 1.00 | 0.65 | 0.02 | asserted 0.99 |
| s3 | I show that this approach is very general and can be modified to consider more realistic modeling of fast parton propagation, such as a fast parton created in an initial hard interaction or the evolution of a parton shower due to medium induced radiation. | future work 0.42 | 0.82 | 0.10 | asserted 0.99 |
| s4 | For the scenario considered here, it is found that local excitations fall sharply as a function of the energy of the fast parton. | result 1.00 | 0.95 | 0.31 | asserted 1.00 |
| s5 | These local excitations couple directly to the sound mode in hydrodynamics and are important for generating an observable shockwave structure. | interpretation 0.92 | 0.66 | 0.25 | asserted 1.00 |
| s6 | This may have implications for the trigger pT dependence of measurements of azimuthal dihadron particle correlations in heavy-ion collisions. | interpretation 1.00 | 0.25 | 0.08 | hedged possibility 1.00 |
| s7 | In particular, one would be less likely to observe a conical emission pattern for increasing trigger pT. | interpretation 0.97 | 0.58 | 0.19 | hedged possibility 0.93 |
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Original abstract
The distribution of energy and momentum deposited by a fast parton in a medium of thermalized quarks, or the source term, is evaluated in perturbative thermal field theory. The calculation is performed by directly evaluating the thermal expectation value of the quark energy-momentum tensor. The fast parton is coupled to the medium by adding an interaction term to the Lagrangian. I show that this approach is very general and can be modified to consider more realistic modeling of fast parton propagation, such as a fast parton created in an initial hard interaction or the evolution of a parton shower due to medium induced radiation. For the scenario considered here, it is found that local excitations fall sharply as a function of the energy of the fast parton. These local excitations couple directly to the sound mode in hydrodynamics and are important for generating an observable shockwave structure. This may have implications for the trigger pT dependence of measurements of azimuthal dihadron particle correlations in heavy-ion collisions. In particular, one would be less likely to observe a conical emission pattern for increasing trigger pT.
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States the same result 1 paper
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It is found that local excitations, which are important for exciting an observable Mach cone structure, fall sharply as a function of the energy of the fast parton.
What it cites · 3 sentences without a confident label
Cites as background 1 paper
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Among the many interesting experimental results from the heavy-ion programs at the Relativistic Heavy Ion Collider (RHIC) and the Large Hadron Collider (LHC), the suppression in the production rates of energetic, or hard, leading particles and jets relative to a naive superposition of nucleon-nucleon collisions is one of the most striking [ref] .
Observation and studies of jet quenching in PbPb collisions at nucleon-nucleon center-of-mass energy = 2.76 TeV · Introduction · 0.88
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