Evidence for electroweak production of $W^{\pm}W^{\pm}jj$ in $pp$ collisions at $\sqrt{s}$ = 8 TeV with the ATLAS detector

This poster presents the first study of $W^{\pm}W^{\pm}jj$, same-electric-charge $W$ pair production in association with two hadronic jets, using 20.3 fb$^{−1}$ of proton-proton collision data at $\sqrt{s}$ = 8 TeV recorded by the ATLAS detector at the LHC. Events with two same-electric-charge leptons ($e^{\pm}e^{\pm}$, $e^{\pm}\mu^{\pm}$, and $\mu^{\pm}\mu^{\pm}$) and at least two jets are analyzed. Cross sections are measured in two fiducial regions for the inclusive and electroweak-only productions respectively. First evidence is observed with a significance of 4.5 standard deviations for the inclusive production and 3.6 standard deviations for the electroweak-only production. The measured cross sections are in agreement with Standard Model predictions. Limits are set on anomalous quartic gauge couplings at 95% C.L. .