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The momentum distribution and particle correlation due to the mass differencewere studied both in the case of the conventional expectation value and in thecase of $q$-expectation value, when the momentum distribution is described by aTsallis distribution with the entropic parameter $q \ge 1$. The magnitude ofthe momentum distribution for hard modes increases as $q$ increases, and the$q$-dependence of the momentum distribution is quite weak for soft modes. Thecorrelation at $q>1$ is larger than that at $q=1$ for soft modes, while thecorrelation at $q>1$ is smaller than that at $q=1$ for hard modes. The$q$-dependence of these quantities in the case of $q$-expectation value isweaker than that in the case of the conventional expectation value,respectively.

Momentum Distribution and Correlation due to mass difference caused by power-like distribution