This Letter presents the first study of $W^{\pm }W^{\pm }jj$, same-electric-charge diboson production in association with two jets, using 20.3 fb$^{-1}$ of proton-proton collision data at $\sqrt{s}=8$ TeV recorded by the ATLAS detector at the Large Hadron Collider. Events with two reconstructed same-charge leptons ( $ e^{\pm }e^{\pm }, e^{\pm }\mu ^{\pm }$, and $\mu ^{\pm }\mu ^{\pm } $ ) and two or more jets are analyzed. Production cross sections are measured in two fiducial regions, with different sensitivities to the electroweak and strong production mechanisms. First evidence for $W^{\pm }W^{\pm }jj$ production and electroweak-only $W^{\pm }W^{\pm }jj$ production is observed with a significance of 4.5 and 3.6 standard deviations, respectively. The measured production cross sections are in agreement with standard model predictions. Limits at 95% confidence level are set on anomalous quartic gauge couplings.
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wydział: instytut / zakład / katedra:
Wydział Fizyki, Astronomii i Informatyki Stosowanej : Instytut Fizyki im. Mariana Smoluchowskiego