2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/194439The capabilities of the CMS experiment to study the low-x parton structure and QCD evolution in the proton and the nucleus at LHC energies are presented through four different measurements, to be carried out in Pb-Pb at sqrt(s_NN) = 5.5 TeV: (i) the charged hadron rapidity density $dN_{ch}/dη$ and (ii) the ultraperipheral (photo)production of Upsilon; and in p-p at sqrt(s) = 14 TeV: (iii) inclusive forward jets and (iv) Mueller-Navelet dijets (separated by $Deltaη\gtrsim$ 8).Quark Matter'06 Proceedings. To appear in J.Phys.GHigh Energy Physics - ExperimentNuclear ExperimentNuclear Theorytext