TeV) kaons (blue triangles: “right” for $W_{2}
=2.76$ TeV, “left” for $W_{2}=0.9$ TeV) and protons (back circles for $W_{2}
=2.76$ TeV and black squares $W_{2}=0.9$ TeV) for different values of the exponent $\lambda$ a) $\lambda=0$, b) $\lambda=0.2$, c) $\lambda=0.27$ and d) $\lambda=0.3$.[]{data-label="fig:rpT"}](Alice_RpT_030.pdf "fig:")

In order to asses the quality of GS we shall apply the *method of ratios* used previously in Refs. [@Praszalowicz:2011rm; @Praszalowicz:2013uu] in the context of hadron scattering and in Refs. [@Praszalowicz:2012zh] for DIS. Hypothesis of GS means that particle spectra measured at different energies $W$ are equal when expressed in terms of scaling variable $\tau$ (\[taupdef\]) – (\[taumtpdef\]) or (\[taumdef\]). Therefore for each particle species $\alpha$ we have $$\left.  \frac{1}{p_{\text{T}}}\frac{d^{2}N_{\alpha}}{dy dp_{\text{T}}}\right\vert
_{\left\vert y\right\vert <y_{0}}=\frac{1}{Q_{0}^{2}}F_{\alpha}(\tau
)\label{GS}%$$ where $F_{\alpha}(\tau)$ is energy independent function of scaling variable $\tau$ which, however, may depend on particle species $\alpha$. Here $y_{0}$ is the rapidity cut (assumed to be small) which we shall omit in the following. Therefore, if hypothesis of GS is true, we expect that the ratios of multiplicity distributions at two different energies $W_{1}$ and $W_{2}$ (denoted hereafter as $R_{W_{1}/W_{2}}$) should be equal to unity if expressed in terms of scaling variable $\tau$. For the purpose of the present analysis we 