Physics – Nuclear Physics – Nuclear Theory
Scientific paper
1998-06-26
Phys.Lett. B439 (1998) 6-11
Physics
Nuclear Physics
Nuclear Theory
corrected version
Scientific paper
10.1016/S0370-2693(98)01046-6
The so-called $\Phi$ parameter, which measures the transverse momentum or energy correlations (fluctuations) in high-energy collisions independently of the particle multiplicity, is computed for the equilibrium ideal gas. As expected $\Phi$ vanishes for the particles obeying Boltzmann statistics but is finite for the quantum particles, positive for bosons and negative for fermions. $\Phi_{p_{\perp}}$, which is found for the pions gas, significantly exceeds the value of $\Phi_{p_{\perp}}$ measured by the NA49 experiment. The discrepancy is discussed.
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