Critical Behavior at the Chiral Phase Transition
C. Bernard, T. Blum, C. E. DeTar, U. M. Heller, S. Gottlieb, J. E. Hetrick, Beat Jegerlehner, K. Rummukainen, R. L. Sugar, D. Toussaint, M. Wingate
Abstract
Quantum chromodynamics with two zero mass flavors is expected to exhibit a phase transition with O(4) critical behavior. Fixing the universality class is important for phenomenology and for facilitating the extrapolation of simulation data to physical quark mass values. At Lattice '96 the Tsukuba and Bielefeld groups reported results from new simulations with dynamical staggered quarks at Nt = 4, which suggested a departure from the expected critical behavior. We report observations of similar deviations and discuss efforts in progress to understand this phenomenon.
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