equations have traveling wave solutions which explicitly exhibit GS [@Munier:2003vc]. An effective theory relevant for the small Bjorken $x$ region is so called Color Glass Condensate (CGC) [@MLV]. For the purpose of present work the details of the saturation are not of primary importance; it is the very existence of the saturation scale which plays the crucial role.

For processes with an external scale ($Q^{2}$ in DIS or $p_{\mathrm{T}}^{2}$ of an observed particle produced in hadron-hadron scattering) larger than a typical non-perturbative energy scale $\Lambda^{2}$ being of the order of a couple of hundreds MeV, and smaller than, say, 10 GeV where perturbative QCD can be applied, observables like photon-proton cross-section or charged particle multiplicity depend only upon the ratio of this scale to $Q^{2}_{\mathrm{s}}$ called scaling variable $\tau$. This property is referred to as geometrical scaling [@Stasto:2000er]. However, in a situation where two (or more) external energy scales are present, there exist more than one such ratios, what implies violation or at least modification of GS. Indeed, as we have shown in Ref. [@Praszalowicz:2013uu], particle production in forward rapidity region provides a *bona fide* example of GS violation. Another possible case of interest are spectra of identified particles where 