Ali, Sajid and Bala, Dibyendu and Kaczmarek, Olaf and Shu, Hai-Tao and Ueding, Tristan and HotQCD Collaboration, (2023) Study of Quarkonium in QGP from Unquenched Lattice QCD. FEW-BODY SYSTEMS, 64 (3): 52. ISSN 0177-7963, 1432-5411
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This paper discusses the charmonium and bottomonium correlators in the pseudoscalar channel and the corresponding spectral reconstruction on the lattice. The absence of a transport peak in the pseudoscalar channel spectral function allows for an easier study of the in-medium modification of bound states. However, extracting spectral information from Euclidean correlators is still a numerically ill-posed problem. To constrain the spectral reconstruction, we use an ansatz motivated from perturbation theory. The perturbative model spectral function has two main contributions: a thermal part around the threshold obtained from pNRQCD and the vacuum part well above the threshold. These two regions are matched continuously, and the model spectral function is obtained by introducing parameters that control the overall thermal shift of the peak and the overall amplitude. The lattice correlator data is computed using clover-improved Wilson valence fermions on large and fine gauge field configurations generated using N-f = 2 + 1 flavors Highly Improved Staggered Quark action with physical strange quark mass m(s), and slightly heavy degenerate up and down quark masses m(l )= m(s)/5 that correspond to m(p) ? 320 MeV. Our results obtained at T = 220 MeV and T = 251 MeV suggest that no resonance peaks are needed to describe the charmonium lattice data at these temperatures, while for bottomonium thermally broadened resonance peaks persists.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | SPECTRAL FUNCTIONS; HEAVY QUARKONIUM; SUPPRESSION; COLLISIONS; CONTINUUM; SYSTEMS; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 16 Mar 2024 12:56 |
| Last Modified: | 16 Mar 2024 12:56 |
| URI: | https://pred.uni-regensburg.de/id/eprint/60189 |
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