Speaker
Description
Precision measurements of the production cross-sections of Z bosons at LHC provide important tests of perturbative QCD and constrain the parton distribution functions for quarks within the proton. This talk will present an extraordinarily precise double-differential measurement of the Z boson in the full phase space of the decay leptons at a centre-of-mass energy of 8 TeV. The recoil of the Z-boson is sensitive to quark and gluon emissions and is used to determine the strong coupling constant in a novel approach using the Sudakov region. If available, a measurement of Drell-Yan production at high invariant mass using 13 TeV data will also be presented. The results are compared to state-of-the-art predictions in perturbative QCD, supplemented by resummation of logarithmically-enhanced contributions in the small transverse-momentum region of the lepton pairs.
