Tsallis statistics approach to the transverse momentum distributions in   p-p collisions
  Transverse momentum distributions of negatively charged pions produced in p-p interactions at beam momenta 20, 31, 40, 80 and 158 GeV/c are studied using the Tsallis distribution as a parametrization. Results are compared with higher energies data and changes of parameters with energy are determined. Different Tsallis-like distributions are compared. 
Maciej Rybczynski and Zbigniew Wlodarczyk
hep-ph nucl-th