Inspire record | arXiv:1906.03203 [hep-ex] | Phys. Rev. Lett. 123 (2019) 161801 | doi:10.1103/PhysRevLett.123.161801
This Letter presents the observation and measurement of electroweak production of a same-sign $W$ boson pair in association with two jets using 36.1 fb$^{-1}$ of proton-proton collision data recorded at a center-of-mass energy of $\sqrt{s}=13$ TeV by the ATLAS detector at the Large Hadron Collider. The analysis is performed in the detector fiducial phase-space region, defined by the presence of two same-sign leptons, electron or muon, and at least two jets with a large invariant mass and rapidity difference. A total of 122 candidate events are observed for a background expectation of $69 \pm 7$ events, corresponding to an observed signal significance of 6.5 standard deviations. The measured fiducial signal cross section is $\sigma^{\textrm {fid.}}=2.89^{+0.51}_{-0.48} \textrm{(stat.)}\ ^{+0.29}_{-0.28} \textrm{(syst.)}\textrm{ fb}$.
Inspire record | arXiv:1906.03203 [hep-ex] | Phys. Rev. Lett. 123 (2019) 161801 | doi:10.1103/PhysRevLett.123.161801
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