Precision measurements and searches with single and multiple gauge bosons with the ATLAS detector

The ATLAS collaboration has carried out a set of measurements at center-of-mass energies of 8 TeV and 13 TeV, which provide stringent tests of the electroweak sector of the Standard Model, specifically on single, di- and multi-boson production cross sections.This paper gives a review of the latest results on these topics from ATLAS. It covers the inclusive production measurement of single W and Z/γ * bosons and the measurement of the complete set of coefficients that describe the angular distributions of the decay leptons in Z events. Also it includes the review of the inclusive and differential cross sections measurements for the production of two heavy gauge bosons ( WW , WZ , ZZ ) in the leptonic channels, the production measurement of the Z boson in association with one or two photons and the search for the WZ production via vector-boson scattering. These measurements are compared to (N)NLO predictions of the Standard Model and provide model-independent constraints on the so-called «new physics», by setting the limits on the anomalous triple or quartic gauge-boson couplings.

Measurement of integrated, differential cross sections and different angular distributions -to prove validity of Standard Model at the TeV scale; -to compare with theory predictions of higher order QCD and QED effects; -to probe the proton structure; -to understand irreducible diboson backgrounds into Higgs and exotic analyses.
Extrapolation of self-coupling structure of gauge bosons -will improve our understanding of electroweak symmetry breaking and unitarity; -intersect with determination of Higgs couplings; -indicate "new physics" if anomalous triple/quartic gauge couplings are present.

More details:
Cross-section measurement in a nutshell  Inclusive W and Z @ 13 TeV Cross section ratios:  Some uncertainties are partially cancelled in ratios (lumi, lepton ID and trigger)  W + /W -: better agreement with CT14nnlo and MMHT14nnlo (precision: ~1%: just uncorrelated part of multijet bkg uncertainty)  W/Z: good agreement for all PDF sets (precision: ~2%: multijet bkg, JES, JER error).
-To improve PDFs -it needs higher precision.

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Precision increased up to comparisons with NNLO theory predictions.A lot of nice ATLAS SM results using Run1/Run2 data were currently produced.Two main goals of Standard Model (SM) measurements in ATLAS are: to test theory with high precision and to find signs of new physics.