Measure charge transport in high-energy nuclear collisions with an energy scan of isobaric collisions
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arXiv
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| Auteurs principaux: | , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866915912548876288 |
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| author | Lv, Wendi Magdy, Niseem Ma, Rongrong Tang, Zebo Tribedy, Prithwish Tsang, Chun Yuen Xu, Zhangbu |
| author_facet | Lv, Wendi Magdy, Niseem Ma, Rongrong Tang, Zebo Tribedy, Prithwish Tsang, Chun Yuen Xu, Zhangbu |
| contents | We present a method to measure electric-charge transport in high-energy nuclear collisions using a beam-energy scan of isobaric systems. Comparing collisions of nuclei with identical mass number but different atomic number allows the charge difference ($ΔQ$) to be extracted with a double-ratio technique that suppresses most experimental systematic uncertainties. By varying the beam energy, the rapidity gap ($Δy$) over which electric charge is transported can be systematically scanned. Simulations of Ru+Ru and Zr+Zr collisions at $\sqrt{s_{\rm NN}}$=19.6-200GeV with UrQMD and PYTHIA Angantyr show that midrapidity $ΔQ$ decreases exponentially with increasing $Δy$, with the slope parameter exhibiting strong model dependence. Comparisons with the baryon number transport reveal distinct patterns. In both UrQMD and PYTHIA Angantyr (with and without final-state baryon junctions), where baryon number is carried solely by valence quarks, the rapidity slope for baryon transport is larger than that for electric-charge transport. In contrast, scenarios that include baryon junctions in the initial state are expected to produce the opposite trend. This demonstrates that an isobar beam-energy scan provides a sensitive probe of electric-charge transport and offers new constraints on the microscopic mechanisms governing conserved-charge redistribution in QCD matter. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_02825 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Measure charge transport in high-energy nuclear collisions with an energy scan of isobaric collisions Lv, Wendi Magdy, Niseem Ma, Rongrong Tang, Zebo Tribedy, Prithwish Tsang, Chun Yuen Xu, Zhangbu Nuclear Experiment High Energy Physics - Experiment We present a method to measure electric-charge transport in high-energy nuclear collisions using a beam-energy scan of isobaric systems. Comparing collisions of nuclei with identical mass number but different atomic number allows the charge difference ($ΔQ$) to be extracted with a double-ratio technique that suppresses most experimental systematic uncertainties. By varying the beam energy, the rapidity gap ($Δy$) over which electric charge is transported can be systematically scanned. Simulations of Ru+Ru and Zr+Zr collisions at $\sqrt{s_{\rm NN}}$=19.6-200GeV with UrQMD and PYTHIA Angantyr show that midrapidity $ΔQ$ decreases exponentially with increasing $Δy$, with the slope parameter exhibiting strong model dependence. Comparisons with the baryon number transport reveal distinct patterns. In both UrQMD and PYTHIA Angantyr (with and without final-state baryon junctions), where baryon number is carried solely by valence quarks, the rapidity slope for baryon transport is larger than that for electric-charge transport. In contrast, scenarios that include baryon junctions in the initial state are expected to produce the opposite trend. This demonstrates that an isobar beam-energy scan provides a sensitive probe of electric-charge transport and offers new constraints on the microscopic mechanisms governing conserved-charge redistribution in QCD matter. |
| title | Measure charge transport in high-energy nuclear collisions with an energy scan of isobaric collisions |
| topic | Nuclear Experiment High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2604.02825 |