Pion Fluctuations near the QCD Critical Point

TL;DR

This paper investigates pion density fluctuations near the QCD critical point, revealing universal patterns and proposing experimental measurement frameworks to test the critical behavior in high-energy collisions.

Contribution

It identifies a universal intermittency pattern of pion fluctuations at the QCD critical point and links it to critical exponents, providing a basis for experimental verification.

Findings

Universal intermittency pattern of pion-density fluctuations

Monte Carlo simulation of critical events in heavy-ion collisions

Framework for event-by-event measurements to test QCD criticality

Abstract

A critical point of second order, belonging to the universality class of the 3d Ising model, has recently been advocated as a strong candidate for the critical behaviour (at high temperatures) of QCD with non-zero quark masses. The implications of this conjecture are investigated in the multiparticle environment of high-energy collisions. A universal intermittency pattern of pion-density fluctuations is found, at the critical point, and its association to the critical exponents is discussed. A Monte Carlo simulation of critical events, in heavy-ion collisions, reveals the detailed structure of these fluctuations, suggesting a framework of (event-by-event) measurements in which the critical theory of QCD may become falsifiable.