  A specific value of light front variable $\zeta_c(p_T,m)$ of the inclusively
produced hadrons in a relativistic nuclear collision is constructed as a
polynomial in transverse momentum $p_T$ of the particle within the UrQMD
transport model. It is shown that those particles with the absolute value of
their light front variable $\zeta$ greater than the corresponding
$\zeta_c(p_T,m)$ follow a Fermi-Dirac or Bose-Einstein distribution depending
upon the spin of the particle.
