On spectral temperatures of negative pions produced in d 12 C, 4 He 12 C, and 12 C 12 C collisions at 4.2 A GeV/ c

The experimental transverse momentum distributions of negative pions produced in d 12C, 4He12C, and 12C12C collisions at 4.2 A GeV/c were analyzed in the framework of Hagedorn Thermodynamic Model. The spectral temperatures of π − mesons as well as their relative contributions to the total multiplicity of π − mesons were extracted from fitting the p t spectra by two-temperature Hagedorn function. The results were compared systematically with the earlier results obtained from analysis of non-invariant center-of-mass energy spectra of negative pions produced in the analyzed collisions.