Proton number fluctuation as a signal of the QCD critical end-point

Details Proton number fluctuation as a signal of the QCD critical end-point Proton number fluctuation as a signal of the QCD critical end-point

2003-02-02

arxiv.org/abs/hep-ph/0302002v2

Phys.Rev.Lett. 91 (2003) 102003; Erratum-ibid. 91 (2003) 129901

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, version accepted in PRL

Scientific paper

10.1103/PhysRevLett.91.129901

We argue that the event-by-event fluctuation of the proton number is a meaningful and promising observable for the purpose of detecting the QCD critical end-point in heavy-ion collision experiments. The long range fluctuation of the order parameter induces a characteristic correlation between protons which can be measured. The proton fluctuation also manifests itself as anomalous enhancement of charge fluctuations near the end-point, which might be already seen in existing data.

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