Photon emissivity of the quark-gluon plasma: A lattice QCD analysis of the transverse channel

Cè, Marco; Harris, Tim; Krasniqi, Ardit; Meyer, Harvey B.; Török, Csaba

doi:10.1103/physrevd.106.054501

Cited by 13 publications

(13 citation statements)

References 54 publications

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“…On the lattice, we determined the static susceptibility in Ref. [12] to be (lat) / 2 = 0.882 (11) stat (19) sys . Using this normalization, the lattice result is [| |/ ] (lat) ≈ 0.76 that is about 13% larger than the value in N = 4 SYM theory.…”

Section: Comparisonsmentioning

confidence: 99%

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Estimation of the photon production rate using imaginary momentum correlators

Török¹,

Cè²,

Harris³

et al. 2023

Proceedings of the 39th International Symposium on Lattice Field Theory — PoS(LATTICE2022)

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The thermal photon emission rate is determined by the spatially transverse, in-medium spectral function of the electromagnetic current. Accessing the spectral function using Euclidean data is, however, a challenging problem due to the ill-posed nature of inverting the Laplace transform. In this contribution, we present the first results on implementing the proposal of directly computing the analytic continuation of the retarded correlator at fixed, vanishing virtuality of the photon via the calculation of the appropriate Euclidean correlator at imaginary spatial momentum. We employ two dynamical O( )-improved Wilson fermions at a temperature of 250 MeV.

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Section: Comparisonsmentioning

confidence: 99%

“…Recent lattice QCD studies addressing the determination of the thermal photon rate are Refs. [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Estimation of the photon production rate using imaginary momentum correlators

Török¹,

Cè²,

Harris³

et al. 2023

Proceedings of the 39th International Symposium on Lattice Field Theory — PoS(LATTICE2022)

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“…In Ref. [36] the photon emissivity (along with the lepton-pair production rate) is computed based on continuumextrapolated (Euclidean) time-dependent correlators with 𝑁 f = 2 O (𝑎)-improved Wilson fermions at 𝑇 ∼ 1.2𝑇 c and 𝑚 𝜋 ∼ 270 MeV. Their final result for the photon emissivity is displayed in Fig.…”

Section: Transport Propertiesmentioning

confidence: 99%

QCD thermodynamics: an overview of recent progress

Cuteri¹

2023

Proceedings of the 39th International Symposium on Lattice Field Theory — PoS(LATTICE2022)

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“…The spectral reconstruction of inclusive rates John Bulava the determination of PDFs from Ioffe time data [25], and the photon emissivity of the quarkgluon plasma [26]. These applications do not employ the algorithmic variant enabling a priori specification of the smearing kernel, but could perhaps benefit from it in the future.…”

Section: Pos(lattice2022)231mentioning

confidence: 99%

The spectral reconstruction of inclusive rates

Bulava¹

2023

Proceedings of the 39th International Symposium on Lattice Field Theory — PoS(LATTICE2022)

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A recently re-discovered variant of the Backus-Gilbert algorithm for spectral reconstruction enables the controlled determination of smeared spectral densities from lattice field theory correlation functions. A particular advantage of this approach is the a priori specification of the kernel with which the underlying spectral density is smeared, allowing for variation of its peak position, smearing width, and functional form. If the unsmeared spectral density is sufficiently smooth in the neighborhood of a particular energy, it can be obtained from an extrapolation to zero smearing-kernel width at fixed peak position. A natural application for this approach is scattering processes summed over all hadronic final states. As a proof-of-principle test, an inclusive rate is computed in the two-dimensional O(3) sigma model from a two-point correlation function of conserved currents. The results at finite and zero smearing radius are in good agreement with the known analytic form up to energies at which 40-particle states contribute, and are sensitive to the 4-particle contribution to the inclusive rate. The straight-forward adaptation to compute the 𝑅-ratio in lattice QCD from two-point functions of the electromagnetic current is briefly discussed.

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Photon emissivity of the quark-gluon plasma: A lattice QCD analysis of the transverse channel

Cited by 13 publications

References 54 publications

Estimation of the photon production rate using imaginary momentum correlators

Estimation of the photon production rate using imaginary momentum correlators

QCD thermodynamics: an overview of recent progress

The spectral reconstruction of inclusive rates

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