Measurement of the tt?Z and tt?W production cross sections in multilepton final states using 3.2 fb -1 of pp collisions at s = 13 TeV with the ATLAS detector
英文:
Measurement of the tt?Z and tt?W production cross sections in multilepton final states using 3.2 fb -1 of pp collisions at s = 13 TeV with the ATLAS detector
A measurement of the $t\bar{t}Z$ and $t\bar{t}W$ production cross sections in final states with either two same-charge muons, or three or four leptons (electrons or muons) is presented. The analysis uses a data sample of proton?proton collisions at $\sqrt{s} = 13$ TeV recorded with the ATLAS detector at the Large Hadron Collider in 2015, corresponding to a total integrated luminosity of 3.2?fb$^{-1}$ . The inclusive cross sections are extracted using likelihood fits to signal and control regions, resulting in $\sigma _{t\bar{t}Z} = 0.9 \pm 0.3$ ?pb and $\sigma _{t\bar{t}W} = 1.5 \pm 0.8$ ?pb, in agreement with the Standard Model
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