Signatures of the Tricritical Point in QCD

摘要: Several approaches to QCD with two {ital massless} quarks at finite temperature T and baryon chemical potential {mu} suggest the existence of a tricritical point on boundary phase spontaneously broken chiral symmetry. In massive} there is then critical end first order transition line. We discuss possible experimental signatures this point, which provide information about its location properties. propose combination event-by-event observables, including suppressed fluctuations in and, simultaneously, enhanced multiplicity soft pions. {copyright} 1998} The American Physical Society }