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Low mass dilepton radiation at RHIC
Nuclear Theory · Submitted 12 Dec 2007
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim We find that while chemical off-equilibrium helps explain part of the low mass (0.15 $\leq$ M GeV $\leq$ 0.7) enhancement seen in the data there is still a large discrepancy.
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The abstract, sentence by sentence
In this work we discuss the emission of low mass dilepton radiation from a hydrodynamic evolution model of Au-Au collisions and make comparisons with recent PHENIX measurements. The dilepton emission rates from the hadronic phase are treated at finite temperature and baryon density and are completely constrained by broken chiral symmetry in a density expansion. The rates are expressed in terms of vacuum correlators which are measured in $e^+e^-$ annihilation, $\tau$ decays and photo-reactions on nucleons and nuclei. We consider two possibilities for the hadronic phase: A chemical equilibrated an off equilibrium hadronic gas. We find that while chemical off-equilibrium helps explain part of the low mass (0.15 $\leq$ M GeV $\leq$ 0.7) enhancement seen in the data there is still a large discrepancy.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | In this work we discuss the emission of low mass dilepton radiation from a hydrodynamic evolution model of Au-Au collisions and make comparisons with recent PHENIX measurements. | contribution 0.99 | 0.83 | 0.05 | unclear 0.54 |
| s1 | The dilepton emission rates from the hadronic phase are treated at finite temperature and baryon density and are completely constrained by broken chiral symmetry in a density expansion. | method 0.98 | 0.59 | 0.03 | asserted 1.00 |
| s2 | The rates are expressed in terms of vacuum correlators which are measured in $e^+e^-$ annihilation, $\tau$ decays and photo-reactions on nucleons and nuclei. | method 0.98 | 0.14 | 0.02 | asserted 1.00 |
| s3 | We consider two possibilities for the hadronic phase: A chemical equilibrated an off equilibrium hadronic gas. | method 0.90 | 0.54 | 0.03 | asserted 0.43 |
| s4 | We find that while chemical off-equilibrium helps explain part of the low mass (0.15 $\leq$ M GeV $\leq$ 0.7) enhancement seen in the data there is still a large discrepancy. | result 0.98 | 0.96 | 0.82 | asserted 1.00 |
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The paper
Original abstract
In this work we discuss the emission of low mass dilepton radiation from a hydrodynamic evolution model of Au-Au collisions and make comparisons with recent PHENIX measurements. The dilepton emission rates from the hadronic phase are treated at finite temperature and baryon density and are completely constrained by broken chiral symmetry in a density expansion. The rates are expressed in terms of vacuum correlators which are measured in $e^+e^-$ annihilation, $\tau$ decays and photo-reactions on nucleons and nuclei. We consider two possibilities for the hadronic phase: A chemical equilibrated an off equilibrium hadronic gas. We find that while chemical off-equilibrium helps explain part of the low mass (0.15 $\leq$ M GeV $\leq$ 0.7) enhancement seen in the data there is still a large discrepancy.
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References
How the literature uses it
14 arXiv papers cite this in 21 sentences
Papers citing it · 14 sentences without a confident label
Contests it 1 paper
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Models that successfully reproduce the LMR results of CERES and NA60, based on a broadening of the $ρ$ meson spectral function fail to reproduce the PHENIX results [ref] .
Electromagnetic Probes · Low-mass dileptons at RHIC · contest 0.79
Uses its method or tool 1 paper
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In this regime, we make use of the chiral reduction scheme developed in [ref] , as used for the reduction of the thermal electromagnetic emissivities in [ref] .
Polarized $\phi$ meson rates with viscous corrections at RHIC · Emission rates in equilibrium · 0.99
Compares with it 2 papers
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In Fig. [ref] we compare the absolutely normalized mass spectrum [ref] to the following models (i) Ref. [ref] , using spectral functions from HMBT [ref] supplemented with thermal radiation from multi-pion induced processes and non-thermal sources (Drell-Yan annihilation, decays of primordial $ρ$ mesons not equilibrated with the medium and $ρ$ decays after thermal freeze-out), (ii) Ref. [ref] , implementing spectral functions from the $Tϱ$ approach in [ref] , and (iii) Ref. [ref] , where the chiral-reduction formalism has been applied.
Dileptons in Heavy-Ion Collisions · The dilepton signal in heavy-ion collisions · 0.96
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We mention that our results for the low mass dileptons are very close to the calculated spectra from van Hees and Rapp as well as Dusling and Zahed [ref] (cf. the comparison in Ref. [ref] ).
Low mass dilepton production at ultrarelativistic energies · Introduction · 0.92
Cites it as background 2 papers
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The effects to the thermal vector spectral function have been studied through the theorem [ref] , or using chiral reduction formulas based on a virial expansion [ref] , and near critical temperature in a chiral effective field theory involving the vector and axial-vector mesons as well as the pion [ref] .
A novel spectral broadening from vector--axial-vector mixing in dense matter · Introduction · 0.95
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Discussion of dilepton production in heavy ion collision experiments at CERN SPS [ref] and at RHIC [ref] and their comparison to theory can be found in [ref] , for a recent review see also e.g. [ref] and references therein.
Radiation of an electric charge in the field of a magnetic monopole · Introduction · 0.96
What it cites · 13 sentences without a confident label
Uses the method or tool of 5 papers
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The evolution of the collision region is treated with a hydrodynamical model based on reference [ref] .
A Hydrodynamic Description of Heavy Ion Collisions at the SPS and RHIC · Evolution · 1.00
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Below $T_c$ we use the rate equations presented in [ref] for a hadronic gas at finite temperature and Baryon density which are constrained entirely by broken chiral symmetry:
Dilepton and Photon Emission Rates from a Hadronic Gas · Dilepton Rates · 0.96
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Below $T_c$ we use the rate equations presented in [ref] for a hadronic gas at finite temperature and Baryon density which are constrained entirely by broken chiral symmetry:
Dilepton and Photon Emission Rates from a Hadronic Gas II · Dilepton Rates · 0.96
Cites as background 6 papers
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The remaining excess was examined by a number of groups [ref] and was interpreted as a combination of thermal partonic and hadronic contributions with modifications to the spectral function due to finite temperature and Baryon density.
Comprehensive Interpretation of Thermal Dileptons at the SPS · Introduction · 0.92
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The remaining excess was examined by a number of groups [ref] and was interpreted as a combination of thermal partonic and hadronic contributions with modifications to the spectral function due to finite temperature and Baryon density.
From In-In to Pb-Pb collisions: Lessons from high-precision Dilepton Measurements · Introduction · 0.92
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The remaining excess was examined by a number of groups [ref] and was interpreted as a combination of thermal partonic and hadronic contributions with modifications to the spectral function due to finite temperature and Baryon density.
Medium Modifications of Vector Mesons and NA60 · Introduction · 0.92
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