Measurement of directed flow of $K^{*0}$ and $ϕ$ resonances in Au+Au collisions at RHIC BES energies
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arXiv
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866918151445282816 |
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| author | Nasim, Md |
| author_facet | Nasim, Md |
| contents | We report measurements of the directed flow ($v_{1}$) for charged kaons, $ϕ$ mesons, and $K^{*0}$ resonances in Au+Au collisions at $\sqrt{s_{NN}}$ = 14.5, 19.6, and 27 GeV. This analysis includes the first-ever $v_{1}$ measurement for the $K^{*0}$ resonance in heavy-ion collisions. Our results reveal a centrality-dependent difference in directed flow between charged kaons and $K^{*0}$ resonances, with the difference increasing toward more central collisions.In contrast, the $v_{1}$ difference between kaons and $ϕ$ mesons remains nearly constant across centralities. The observed kaon-$K^{*0}$ difference can be qualitatively understood within a hydrodynamic framework that incorporates a hadronic afterburner and an asymmetric loss of $K^{*0}$ yields in momentum-space. Since hadronic rescattering depends strongly on the system size and scattering cross sections among hadrons, the measured $K^{*0}$ $v_{1}$ offers valuable constraints on phase-space-dependent rescattering effects in heavy-ion collisions, thereby providing important input for transport-based models of QCD matter. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_25735 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Measurement of directed flow of $K^{*0}$ and $ϕ$ resonances in Au+Au collisions at RHIC BES energies Nasim, Md Nuclear Experiment High Energy Physics - Experiment We report measurements of the directed flow ($v_{1}$) for charged kaons, $ϕ$ mesons, and $K^{*0}$ resonances in Au+Au collisions at $\sqrt{s_{NN}}$ = 14.5, 19.6, and 27 GeV. This analysis includes the first-ever $v_{1}$ measurement for the $K^{*0}$ resonance in heavy-ion collisions. Our results reveal a centrality-dependent difference in directed flow between charged kaons and $K^{*0}$ resonances, with the difference increasing toward more central collisions.In contrast, the $v_{1}$ difference between kaons and $ϕ$ mesons remains nearly constant across centralities. The observed kaon-$K^{*0}$ difference can be qualitatively understood within a hydrodynamic framework that incorporates a hadronic afterburner and an asymmetric loss of $K^{*0}$ yields in momentum-space. Since hadronic rescattering depends strongly on the system size and scattering cross sections among hadrons, the measured $K^{*0}$ $v_{1}$ offers valuable constraints on phase-space-dependent rescattering effects in heavy-ion collisions, thereby providing important input for transport-based models of QCD matter. |
| title | Measurement of directed flow of $K^{*0}$ and $ϕ$ resonances in Au+Au collisions at RHIC BES energies |
| topic | Nuclear Experiment High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2509.25735 |