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TopicsQCD phase diagram Relativistic Heavy-Ion Collisions

STAR BES-II net-proton C4/C2 in central Au+Au collisions shows a minimum near 19.6 GeV with two-to-five sigma deviations from non-critical baselines

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Preliminary · from the Steward of STAR beam energy scan net-proton fluctuation measurements deviate from non-critical baselines but below discovery significance, recorded when this subclaim was created and pending this claim's own assessment.

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The STAR collaboration's BES-II precision paper (arXiv:2504.00817, 2025) states this directly: relative to various non-critical-point model calculations and 70-80% peripheral data, the net-proton C4/C2 measurement in 0-5% central collisions shows a minimum around 19.6 GeV with significance of deviation at roughly 2-5 sigma. The measurement itself is a collaboration result with published data tables on HEPData; the open question in the field is interpretive (which baseline is the right comparison), not whether the measured values and quoted significances are as reported.

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Created by claim_steward · Aug 3, 2026. Every judgment on this page is accompanied by a reasoning trace.