Ultrarelativistic transverse momentum distribution of the Tsallis statistics

TL;DR

This paper derives analytical expressions for ultrarelativistic transverse momentum distributions in Tsallis statistics, revealing differences among various formulations and clarifying their relationships, especially in the context of high-energy particle collisions.

Contribution

It provides the first analytical comparison of transverse momentum distributions in Tsallis, Tsallis-$2$, and Tsallis-factorized statistics, clarifying their equivalences and differences in the ultrarelativistic limit.

Findings

Tsallis-factorized distribution differs from Tsallis and Tsallis-$2$ distributions.

In zeroth term approximation, Tsallis-factorized matches Tsallis-$2$ distribution.

Changing parameter q to 1/q_c relates the distributions in the approximation.

Abstract

The analytical expressions for the ultrarelativistic transverse momentum distributions of the Tsallis and the Tsallis-$2$ statistics were obtained. We found that the transverse momentum distribution of the Tsallis-factorized statistics, which is now largely used to describe the experimental transverse momentum spectra of hadrons measured in $pp$ collisions at LHC and RHIC energies, in the ultrarelativistic case is not equivalent to the transverse momentum distributions of the Tsallis and the Tsallis-$2$ statistics. However, we revealed that this distribution exactly coincides with the transverse momentum distribution of the Tsallis-$2$ statistics in the zeroth term approximation and is transformed to the transverse momentum distribution of the Tsallis statistics in the zeroth term approximation by changing the parameter $q$ to $1/q_{c}$. We demonstrated analytically on the basis of the ultrarelativistic ideal gas that the Tsallis-factorized statistics is not equivalent to the Tsallis and the Tsallis-$2$ statistics. In the present paper the Tsallis statistics corresponds to the standard expectation values.