Pion Number Fluctuations and Correlations in the Statistical System with Fixed Isospin - Nuclear Theory

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Abstract: The statistical system of pions with zero total isospin is studied. Thesuppression effects for the average yields due to isospin conservation are thesame for $\pi^0$, $\pi^+$ and $\pi^-$. However, a behavior of the correspondingparticle number fluctuations are different. For neutral pions there is theenhancement of the fluctuations, whereas for charged pions the isospinconservation suppresses fluctuations. The correlations between the numbers ofcharged and neutral pions are observed for finite systems. This causes amaximum of the total pion number fluctuations for small systems. Thethermodynamic limit values for the scaled variances of neutral and chargedpions are calculated. The enhancements of the fluctuations due to Bosestatistics are found and discussed.

Autor: V.V. Begun, M.I. Gorenstein, O. A. Mogilevsky

Fuente: https://arxiv.org/