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Observation of Partial<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>U</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="italic">A</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mo>(</mml:mo><mml:mn>1</mml:mn><mml:mo>)</mml:mo></mml:math>Restoration from Two-Pion Bose-Einstein Correlations
The effective intercept parameter of the two-pion Bose-Einstein correlation function, ${\ensuremath{\lambda}}_{*}$, is found to be sensitive to the partial restoration of ${\mathrm{U}}_{A}(1)$ symmetry in ultra-relativistic nuclear collisions. An increase in the yield of the ${\ensuremath{\eta}}^{\ensuremath{'}}$ meson, proposed earlier as a signal of partial ${\mathrm{U}}_{A}(1)$ restoration, is shown to create a …