The U(1) Problem in Chiral Random Matrix Models
Romuald A. Janik, Maciej A. Nowak, Gabor Papp, Ismail Zahed
Abstract
We show that conventional asymmetric chiral random matrix models (ChRMM), with a gaussian distribution in the asymmetry, provide for a screening of the topological charge and a resolution of the U(1) problem in the unquenched approximation. Our exact results to order 1/N are in agreement with numerical estimates using large ensembles of asymmetric ChRMM with gaussian distributions.
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