2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/182803In the extra dimension models of ADD and RS we study the dependence of the various parton distribution functions on observable of Drell-Yan process to NLO in QCD at LHC and Tevatron energies. Uncertainties at LHC due to factorisation scales in going from leading to next-to-leading order in QCD for the various distributions get reduced by about 2.75 times for a $μ_F$ range $0.5 ~Q < μ_F < 1.5 ~Q$. Further uncertainties arising from the error on experimental data are estimated using the MRST parton distribution functions.27 pages, 11 figures, the version to appear in European Physical Journal CHigh Energy Physics - PhenomenologyHigh Energy Physics - Experimenttext