Chemical potential differentials in the QCD phase diagram from heavy-ion isobar collisions
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arXiv
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| Main Authors: | , , , , , |
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| Format: | Preprint |
| Published: |
2026
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| _version_ | 1866908796013510656 |
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| author | Grefa, Joaquin Tsang, Chun Yue Kumar, Rajesh Dexheimer, Veronica Ratti, Claudia Xu, Zhangbu |
| author_facet | Grefa, Joaquin Tsang, Chun Yue Kumar, Rajesh Dexheimer, Veronica Ratti, Claudia Xu, Zhangbu |
| contents | Temperature and baryon, charge, and strangeness chemical potentials characterize QCD matter under extreme conditions. Differences between these chemical potentials and their ratios probe conserved-charge correlations and the system's response in the multidimensional QCD phase diagram. We extract these quantities from STAR Ru+Ru and Zr+Zr isobar collisions using a Bayesian thermal analysis of hadron yields, which substantially reduces systematic uncertainties, and compare them with Taylor-expanded lattice-QCD and Chiral Mean Field model predictions. Isobar collisions thus emerge as a precision probe of four-dimensional QCD thermodynamics. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_21232 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Chemical potential differentials in the QCD phase diagram from heavy-ion isobar collisions Grefa, Joaquin Tsang, Chun Yue Kumar, Rajesh Dexheimer, Veronica Ratti, Claudia Xu, Zhangbu Nuclear Theory High Energy Physics - Experiment High Energy Physics - Lattice High Energy Physics - Phenomenology High Energy Physics - Theory Temperature and baryon, charge, and strangeness chemical potentials characterize QCD matter under extreme conditions. Differences between these chemical potentials and their ratios probe conserved-charge correlations and the system's response in the multidimensional QCD phase diagram. We extract these quantities from STAR Ru+Ru and Zr+Zr isobar collisions using a Bayesian thermal analysis of hadron yields, which substantially reduces systematic uncertainties, and compare them with Taylor-expanded lattice-QCD and Chiral Mean Field model predictions. Isobar collisions thus emerge as a precision probe of four-dimensional QCD thermodynamics. |
| title | Chemical potential differentials in the QCD phase diagram from heavy-ion isobar collisions |
| topic | Nuclear Theory High Energy Physics - Experiment High Energy Physics - Lattice High Energy Physics - Phenomenology High Energy Physics - Theory |
| url | https://arxiv.org/abs/2601.21232 |