OBSERVATION OF PARTIAL U-A(1) RESTORATION FROM 2-PION BOSE-EINSTEIN CORRELATIONS

The effective intercept parameter of the two-pion Bose-Einstein correl ation function, lambda(), is found to be sensitive to the partial res toration of U-A(1) symmetry in ultra-relativistic nuclear collisions. An increase in the yield of the eta' meson, proposed earlier as a sign al of partial UA(1) restoration, is shown to create a ''hole'' in the low p(t) region of lambda(). A comparison with NA44 data and central S + Pb collisions at 200A GeV is made, and implications for future hea vy ion experiments are discussed.