Étude de la section efficace Drell-Yan à faible impulsion transverse du boson Z dans les interactions proton-proton au LHC à $\sqrt{s}$ = 8 TeV

The study concern the Drell-Yan dierential cross section following the transverse momentum, for weak value in comparison of the Z boson mass. For the theory, the Collins-Soper-Sterman formalism is introduced, wich divide in two parts, perturbative and non-perturbative due to the resummation of small transverse momentum gluons. The perturbative part is calculable and the non-perturbatie is universal and must be measured. This present work look for this universality and the understanding of it through the 2012 data range of the CMS detector, the Monte-Carlo simulations and ResBos. The dierential cross section is measured with the small values of transverse momentum. Observing the position of the maximum of the dierential corss section following the invariant mass of the hard process, a growing evolution is observed.