Systematic study of identified particle spectra with radial flow at RHIC and LHC in Tsallis non-extensive statistics

The particle spectrum in high energy experiments can reveal the information of particle production mechanism. It is now a common practice to use the Tsallis distribution to fit the invariant transverse momentum spectra of various particle species at high energy and in a very broad range of the transverse momenta. In reference, the Tsallis distribution is expanded in Taylor series in power of (q-1), where q is the Tsallis parameter and an analytic result is provided in presence of collective flow. We perform the fitting for the data taken at RHIC and LHC energies for Au+Au √S_NN=200 GeV, Pb+Pb √S_NN =2.76 TeV and p+p systems for both energies with this modified function. Then by extracting the fitting parameters like volume, temperature, radial flow and q-parameter, we present a comparative study of these parameters with particle mass