Towards the light front variables for high energy production processes

Scale invariant presentation of inclusive spectra in terms of light front variables is proposed. The variables introduced go over to the well-known scaling variables \(x_F = 2 p_z /\sqrt s\) and \(x_T =2 p_T / \sqrt s\) in the high \(p_z\) and high \(P_T\) limits respectively. Some surface is found in the phase space of produced \(\pi^\pm\)-mesons in the inclusive reaction \(\bar pp \to \pi^\pm X\) at 22.4 GeV/c, which separates two groups of particles with significantly different characteristics. In one of these regions a naive statistical model seems to be in a good agreement with data, whereas it fails in the second region.