Probing how bright the quark-gluon plasma glows in lattice QCD
Fuente:
arXiv
Saved in:
| Main Authors: | , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2025
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866910946872524800 |
|---|---|
| author | Krasniqi, Ardit Cè, Marco Harris, Tim Hudspith, Renwick J. Meyer, Harvey B. |
| author_facet | Krasniqi, Ardit Cè, Marco Harris, Tim Hudspith, Renwick J. Meyer, Harvey B. |
| contents | Determining the spectrum of photons emitted by the quark-gluon plasma non-perturbatively remains an open computational challenge. In this letter we calculate two moments of that spectrum at a temperature $T\approx 254\,$MeV, employing lattice QCD with two flavors of $\mathrm{O}(a)$-improved Wilson fermions, without facing an inverse problem. Our central value for the difference of these two moments, which is sensitive to photon energies $ω\gtrsim πT$, is lower than, but compatible with that obtained by integrating the leading-order weak-coupling photon spectrum. This study informs the $\textit{direct photon puzzle}$ in heavy-ion collision phenomenology, where it has proved difficult to simultaneously explain the yield and azimuthal anisotropy of photons not originating from final-state hadronic decays. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_10295 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Probing how bright the quark-gluon plasma glows in lattice QCD Krasniqi, Ardit Cè, Marco Harris, Tim Hudspith, Renwick J. Meyer, Harvey B. High Energy Physics - Lattice High Energy Physics - Phenomenology Determining the spectrum of photons emitted by the quark-gluon plasma non-perturbatively remains an open computational challenge. In this letter we calculate two moments of that spectrum at a temperature $T\approx 254\,$MeV, employing lattice QCD with two flavors of $\mathrm{O}(a)$-improved Wilson fermions, without facing an inverse problem. Our central value for the difference of these two moments, which is sensitive to photon energies $ω\gtrsim πT$, is lower than, but compatible with that obtained by integrating the leading-order weak-coupling photon spectrum. This study informs the $\textit{direct photon puzzle}$ in heavy-ion collision phenomenology, where it has proved difficult to simultaneously explain the yield and azimuthal anisotropy of photons not originating from final-state hadronic decays. |
| title | Probing how bright the quark-gluon plasma glows in lattice QCD |
| topic | High Energy Physics - Lattice High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2505.10295 |