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Photon and dilepton production from a non-equilibrium quark-gluon plasma
High Energy Physics - Phenomenology · Submitted 14 Sep 2015
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim Our findings indicate that both high-energy photon and dilepton production are sensitive to the assumed level of initial momentum-space anisotropy of the quark-gluon plasma.
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The abstract, sentence by sentence
We calculate leading-order medium photon and dilepton yields from a quark-gluon plasma using (3+1)-dimensional anisotropic hydrodynamics. In the case of dileptons, at leading-order it is sufficient to take into account non-equilibrium corrections to the rate through the use of anisotropic distribution functions. In the case of photons, non-equilibrium corrections to the rate are taken into account using a self-consistent modification of the distribution functions and the corresponding anisotropic hard-loop quark self-energies. We present predictions for the high-energy photon and dilepton spectrum and the photon elliptic flow as a function of invariant mass, transverse momentum, shear viscosity, and initial momentum-space anisotropy. Our findings indicate that both high-energy photon and dilepton production are sensitive to the assumed level of initial momentum-space anisotropy of the quark-gluon plasma. In addition, we find that the photon elliptic flow depends on the initial momentum-space anisotropy.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | We calculate leading-order medium photon and dilepton yields from a quark-gluon plasma using (3+1)-dimensional anisotropic hydrodynamics. | contribution 0.66 | 0.97 | 0.05 | asserted 0.99 |
| s1 | In the case of dileptons, at leading-order it is sufficient to take into account non-equilibrium corrections to the rate through the use of anisotropic distribution functions. | method 0.98 | 0.48 | 0.04 | asserted 0.98 |
| s2 | In the case of photons, non-equilibrium corrections to the rate are taken into account using a self-consistent modification of the distribution functions and the corresponding anisotropic hard-loop quark self-energies. | method 0.99 | 0.89 | 0.04 | asserted 1.00 |
| s3 | We present predictions for the high-energy photon and dilepton spectrum and the photon elliptic flow as a function of invariant mass, transverse momentum, shear viscosity, and initial momentum-space anisotropy. | contribution 0.81 | 0.92 | 0.12 | asserted 0.96 |
| s4 | Our findings indicate that both high-energy photon and dilepton production are sensitive to the assumed level of initial momentum-space anisotropy of the quark-gluon plasma. | result 0.98 | 0.95 | 0.65 | hedged possibility 0.91 |
| s5 | In addition, we find that the photon elliptic flow depends on the initial momentum-space anisotropy. | result 1.00 | 0.96 | 0.17 | asserted 1.00 |
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The paper
Original abstract
We calculate leading-order medium photon and dilepton yields from a quark-gluon plasma using (3+1)-dimensional anisotropic hydrodynamics. In the case of dileptons, at leading-order it is sufficient to take into account non-equilibrium corrections to the rate through the use of anisotropic distribution functions. In the case of photons, non-equilibrium corrections to the rate are taken into account using a self-consistent modification of the distribution functions and the corresponding anisotropic hard-loop quark self-energies. We present predictions for the high-energy photon and dilepton spectrum and the photon elliptic flow as a function of invariant mass, transverse momentum, shear viscosity, and initial momentum-space anisotropy. Our findings indicate that both high-energy photon and dilepton production are sensitive to the assumed level of initial momentum-space anisotropy of the quark-gluon plasma. In addition, we find that the photon elliptic flow depends on the initial momentum-space anisotropy.
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How the literature uses it
3 arXiv papers cite this in 3 sentences
Papers citing it · 2 sentences without a confident label
Cites it as background 1 paper
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The rate is given in terms of the photon polarization $W^<(K)$, which reads [equation] Here $J^μ=∑_q=udse_qq̅γ^μq$ is the EM current and we work in thermal equilibrium, so that the $ρ=e^-βH$ and the Hilbert space trace becomes a thermal average.[A calculation in an off-equilibrium setting relevant for heavy-ion collisions has been presented at this conference in [ref] .] We will work perturbatively in the strong coupling $g$, meaning that we treat the scale $gT$ (the soft scale) as parametrically smaller than the scale $T$ (the hard scale).
The thermal dilepton rate at NLO at small and large invariant mass · Introduction · 0.90
What it cites · 12 sentences without a confident label
Builds on 5 papers
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For dilepton and photon production, the work presented herein is an extension of previous studies performed in Refs. [ref] and Refs. [ref] , respectively, to include a realistic (3+1)D model of the background evolution.
Measuring Quark-Gluon-Plasma Thermalization Time with Dileptons · Introduction · 1.00
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For dilepton and photon production, the work presented herein is an extension of previous studies performed in Refs. [ref] and Refs. [ref] , respectively, to include a realistic (3+1)D model of the background evolution.
Pre-equilibrium dilepton production from an anisotropic quark-gluon plasma · Introduction · 1.00
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For dilepton and photon production, the work presented herein is an extension of previous studies performed in Refs. [ref] and Refs. [ref] , respectively, to include a realistic (3+1)D model of the background evolution.
Suppression of forward dilepton production from an anisotropic quark-gluon plasma · Introduction · 1.00
Uses the method or tool of 5 papers
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We assume that the QGP evolves through a non-equilibrium state and that the quark and anti-quark one-particle distribution functions are well approximated by Eq. ([ref]) at all times [ref] .
Anisotropic Hydrodynamics: Three lectures · QGP evolution · 0.87
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For details concerning the evaluation of the integral ([ref]), we refer the reader to Refs. [ref] .
Pre-equilibrium dilepton production from an anisotropic quark-gluon plasma · Dilepton Rate · 0.84
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For details concerning the evaluation of the integral ([ref]), we refer the reader to Refs. [ref] .
Dilepton production from the quark-gluon plasma using (3+1)-dimensional anisotropic dissipative hydrodynamics · Dilepton Rate · 0.84
Cites as support 2 papers
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In closing, the results of Refs. [ref] and [ref] , which are summarized in this proceedings contribution, indicate that both high-energy photon and dilepton production are sensitive to the assumed level of initial momentum-space anisotropy of the QGP.
Dilepton production from the quark-gluon plasma using (3+1)-dimensional anisotropic dissipative hydrodynamics · Results and Conclusions · 0.99
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In closing, the results of Refs. [ref] and [ref] , which are summarized in this proceedings contribution, indicate that both high-energy photon and dilepton production are sensitive to the assumed level of initial momentum-space anisotropy of the QGP.
Photon production from a non-equilibrium quark-gluon plasma · Results and Conclusions · 0.99
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