Quarkonium $p_{\rm T}$ spectra in heavy--ion collisions at LHC energies within a hydrodynamic core--corona framework
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arXiv
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| Natura: | Preprint |
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2026
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| _version_ | 1866918489535545344 |
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| author | Paul, Biswarup |
| author_facet | Paul, Biswarup |
| contents | We present a systematic study of the transverse momentum ($p_{\rm T}$) spectra of charmonium (J/$ψ$, $ψ(2S)$) and bottomonium ($Υ(nS)$) states in Pb-Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeV within an analytical relativistic hydrodynamics framework. The medium evolution is described assuming cylindrical symmetry with boost-invariant longitudinal expansion and Hubble-like transverse flow. Quarkonium spectra are evaluated using the Cooper-Frye formalism on a constant-temperature freeze-out hypersurface, supplemented by a core--corona approach to include both thermal and non-thermal contributions. The model describes the measurements from ALICE and CMS over a broad $p_{\rm T}$ range. For charmonium, both the spectra and the $ψ(2S)$/J/$ψ$ ratio are well reproduced, while deviations at high $p_{\rm T}$ for J/$ψ$ indicate additional hard production mechanisms. In the bottomonium sector, the $Υ(nS)$ spectra and their yield ratios are successfully described, consistent with the expected sequential suppression pattern. These results demonstrate that an analytical hydrodynamic approach combined with a core-corona framework provides a unified and transparent description of quarkonium production in heavy--ion collisions at LHC energies. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_27473 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Quarkonium $p_{\rm T}$ spectra in heavy--ion collisions at LHC energies within a hydrodynamic core--corona framework Paul, Biswarup Nuclear Theory High Energy Physics - Phenomenology Nuclear Experiment We present a systematic study of the transverse momentum ($p_{\rm T}$) spectra of charmonium (J/$ψ$, $ψ(2S)$) and bottomonium ($Υ(nS)$) states in Pb-Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeV within an analytical relativistic hydrodynamics framework. The medium evolution is described assuming cylindrical symmetry with boost-invariant longitudinal expansion and Hubble-like transverse flow. Quarkonium spectra are evaluated using the Cooper-Frye formalism on a constant-temperature freeze-out hypersurface, supplemented by a core--corona approach to include both thermal and non-thermal contributions. The model describes the measurements from ALICE and CMS over a broad $p_{\rm T}$ range. For charmonium, both the spectra and the $ψ(2S)$/J/$ψ$ ratio are well reproduced, while deviations at high $p_{\rm T}$ for J/$ψ$ indicate additional hard production mechanisms. In the bottomonium sector, the $Υ(nS)$ spectra and their yield ratios are successfully described, consistent with the expected sequential suppression pattern. These results demonstrate that an analytical hydrodynamic approach combined with a core-corona framework provides a unified and transparent description of quarkonium production in heavy--ion collisions at LHC energies. |
| title | Quarkonium $p_{\rm T}$ spectra in heavy--ion collisions at LHC energies within a hydrodynamic core--corona framework |
| topic | Nuclear Theory High Energy Physics - Phenomenology Nuclear Experiment |
| url | https://arxiv.org/abs/2604.27473 |