Robust characteristics of nongaussian fluctuations from the NJL model

Understand

We evaluate the third- and fourth-order baryon, charge and strangeness susceptibilities near a chiral critical point using the Nambu-Jona-Lasinio model.

• We identify robust qualitative behaviours of the susceptibilities along hypothetical freeze-out lines that agree with previous model studies.
• Quantitatively, baryon number fluctuations are the largest in magnitude and thus offer the strongest signal when freeze-out occurs farther away from a critical point.
• Charge and strangeness susceptibilities also diverge at a critical point, but the area where the divergence dominates is smaller, meaning freeze-out must occur closer to a critical point for a signal to be visible in these observables.