Abstract
These proceedings are presenting an overview of the diboson and multiboson production cross-section results obtained by the ATLAS collaboration using proton-proton collisions at the LHC at CERN. The note is focused on the latest measurements of $ZZ$, $W^±Z$, $W^+W^-$ production at $\sqrt{s}$=13 TeV, of $W^+W^-$ and $W^±Z$ production in the semileptonic final state at 8 TeV and of triboson production at 8 TeV. Constraints on anomalous triple and quartic gauge boson couplings obtained from these measurements are briefly discussed as well. At present the measured cross sections are found to be in agreement with the Standard Model predictions within the estimated uncertainties.
Highlights
The measurements of the electroweak gauge bosons production provide a powerful test of the Standard Model (SM) Electroweak (EW) theory at the TeV scale and a precision test of highorder calculations in quantum chromodynamics (QCD)
The diboson results presented in these proceedings include ZZ, W±Z, W+W– production at 13 TeV, W+W– and W±Z production in the semileptonic final state at 8 TeV and triboson production at 8 TeV, and are based on the proton-proton collision data collected by the ATLAS detector [1] at the LHC collider [2]
The qq →WW production cross section is known to O(αs2) (NNLO), the non-resonant gg sub-process is known to O(αs3), and the resonant gg→ H → WW cross section is calculated to O(αs5) taking into account the H → WW branching fraction
Summary
The measurements of the electroweak gauge bosons production provide a powerful test of the Standard Model (SM) Electroweak (EW) theory at the TeV scale and a precision test of highorder calculations in quantum chromodynamics (QCD). These measurements help to test directly the gauge boson self-interactions. The differential cross section measurements allow to perform model-independent new physics search. Those processes are backgrounds to other analyses, for example Higgs boson studies, and should be carefully investigated. The diboson results presented in these proceedings include ZZ, W±Z, W+W– production at 13 TeV, W+W– and W±Z production in the semileptonic final state at 8 TeV and triboson production at 8 TeV, and are based on the proton-proton collision data collected by the ATLAS detector [1] at the LHC collider [2]
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