Recent highlights of inclusive single boson and multiboson measurements with the ATLAS detector

GUSTAVO OTERO Y GARZÓN, EN REPRESENTACIÓN DE LA COLABORACIÓN ATLAS

Congreso; HP2 - High Precision for Hard Processes; 2016

Measurements of the Drell­Yan production of W and Z/gamma* bosons at the LHC provide a benchmark of our understanding of perturbative QCD and probe the proton structure in a unique way. The measurements are compared to state­of­the­art calculations at NNLO in QCD and NLO EWK. New 7 TeV measurements are performed for W and Z/gamma* bosons integrated and as a function of  lepton rapidity and boson mass. Unprecedented precision is reached and strong constraints on parton distribution functions are found. First precise inclusive measurements of W and Z production at 13 TeV are presented. The collaboration has also performed a measurement of  ratios of the cross sections for the production of single Z bosons and top­quark pairs at various center­of­mass energies which exploit differences in the range of the probed parton momenta. The 8 TeV dataset has been used to perform a series of complementary precision measurements of Z/gamma* production. This includes studies of angular distributions at the Z peak, the transverse momentum spectrum with dilepton masses from 12 to 150 GeV and finally double­differential cross sections in the di­lepton mass range up to the TeV scale. Measurements of the cross sections of the production of multiple electroweak gauge bosons constitute stringent tests of the electroweak sector of the Standard Model and  provide a model­independent means  to search for new physics at the TeV scale. We present recent measurements of inclusive and differential cross sections for  WW, WZ, ZZ, and Z+photon  at cms energies of 8 TeV and 13 TeV. Large next­to­next­to­leading order QCD corrections were recently calculated and are confronted with the measurements.