Quark number scaling of hadronic pT spectra and constituent quark degree of freedom in p-Pb collisions at sNN=5.02 TeV

We show that the experimental data of transverse momentum (pT) spectra of identified hadrons released recently by ALICE collaboration for p-Pb collisions at sNN=5.02 TeV exhibit a distinct universal behavior - the quark number scaling. We further show that the scaling is a direct consequence of quark (re-)combination mechanism of hadronization and can be regarded as a strong indication of the existence of the underlying source with constituent quark degree of freedom for the production of hadrons in p-Pb collisions at such high energies. We make also predictions for production of other hadrons.