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Observation of Electroweak Production of a Same-Sign W Boson Pair in Association with Two Jets in pp Collisions at √s =13 TeV with the ATLAS Detector

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Article number161801
<mark>Journal publication date</mark>15/10/2019
<mark>Journal</mark>Physical review letters
Issue number16
Number of pages21
Publication StatusPublished
<mark>Original language</mark>English


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 √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±7 events, corresponding to an observed signal significance of 6.5 standard deviations. The measured fiducial signal cross section is σfid=2.89-0.48+0.51(stat)-0.28+0.29(syst) fb.