The thermal photon emissivity at the QCD chiral crossover from imaginary momentum correlators
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arXiv
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| Autori principali: | , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866916088465326080 |
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| author | Krasniqi, Ardit Cè, Marco Harris, Tim Hudspith, Renwick J. Meyer, Harvey B. Török, Csaba |
| author_facet | Krasniqi, Ardit Cè, Marco Harris, Tim Hudspith, Renwick J. Meyer, Harvey B. Török, Csaba |
| contents | The thermal photon emissivity at the QCD chiral crossover is investigated using imaginary momentum correlators. These have been measured on a newly generated $20 \times 96^3$ lattice-QCD ensemble with $\mathcal{O}(a)$-improved Wilson quarks and physical up, down and strange quark masses at a temperature $T=154$\,MeV near the pseudo-critical temperature. In order to realize the photon on-shell condition, the spatially transverse Euclidean correlators have to be evaluated at imaginary spatial momenta. Employing a bounding method, we present a preliminary result on the quantity $H_E(ω_1)$, which corresponds to an energy-moment of the photon spectral function $σ(ω)/ω$ defined by the weight function $1/(ω^2+ω_n^2)$, the $ω_n$ being integer multiples of $2πT$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_05951 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | The thermal photon emissivity at the QCD chiral crossover from imaginary momentum correlators Krasniqi, Ardit Cè, Marco Harris, Tim Hudspith, Renwick J. Meyer, Harvey B. Török, Csaba High Energy Physics - Lattice The thermal photon emissivity at the QCD chiral crossover is investigated using imaginary momentum correlators. These have been measured on a newly generated $20 \times 96^3$ lattice-QCD ensemble with $\mathcal{O}(a)$-improved Wilson quarks and physical up, down and strange quark masses at a temperature $T=154$\,MeV near the pseudo-critical temperature. In order to realize the photon on-shell condition, the spatially transverse Euclidean correlators have to be evaluated at imaginary spatial momenta. Employing a bounding method, we present a preliminary result on the quantity $H_E(ω_1)$, which corresponds to an energy-moment of the photon spectral function $σ(ω)/ω$ defined by the weight function $1/(ω^2+ω_n^2)$, the $ω_n$ being integer multiples of $2πT$. |
| title | The thermal photon emissivity at the QCD chiral crossover from imaginary momentum correlators |
| topic | High Energy Physics - Lattice |
| url | https://arxiv.org/abs/2401.05951 |