Observation of Partial U_A(1) Restoration from Two-Pion Bose-Einstein Correlations

Details Observation of Partial U_A(1) Restoration from Two-Pion Bose-Einstein Correlations Observation of Partial U_A(1) Restoration from Two-Pion Bose-Einstein Correlations

1998-02-24

arxiv.org/abs/nucl-th/9802074v2

Phys.Rev.Lett. 81 (1998) 2205-2208

Physics

Nuclear Physics

Nuclear Theory

10 pages, 3 figures, typos corrected and content revised

Scientific paper

10.1103/PhysRevLett.81.2205

The effective intercept parameter of the two-pion Bose-Einstein correlation function, lambda_*, is found to be sensitive to the partial restoration of U_A(1) symmetry in ultra-relativistic nuclear collisions. An increase in the yield of the eta' meson, proposed earlier as a signal of partial U_A(1) restoration, is shown to create a ``hole'' in the low p_t region of lambda_*. A comparison with NA44 data from central S+Pb collisions at 200 AGeV is made and implications for future heavy ion experiments are discussed.

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