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At hadron colliders, top quarks are dominantly produced in pairs($t\bar{t}$), a production mechanism that was discovered more than twenty yearsago at the Tevatron in Fermilab. Although the \ttbar process has alreadyentered the domain of "precision" physics, especially with the advent of themulti-TeV energies at the CERN LHC, there still remains room for dedicatedexperimental measurements of the top quark in the "gap" of energies betweenTevatron and LHC. Hence, in the study presented here the total inclusive crosssection for pair production at a center-of-mass energy of 5.02 TeV is measuredhaving utilized a low-pileup proton-proton (pp) collision dataset whoserecorded luminosity by CMS amounts to 26 pb$^{-1}$. This work, has consideredonly leptonic W decays, the latter characterized by the presence of anenergetic opposite-sign lepton pair plus missing energy. The currentmeasurement can be used for stronger constraints to the poorly known gluondistribution inside the proton at large longitudinal parton momentum fraction,while it paves the way for the very first observation of this elementaryparticle in nucleus-nucleus collisions.

Measurement of the top quark pair production cross section at $\sqrt{s} = 5.02$ TeV in the dilepton channel with the CMS detector