Measurement and interpretation of same-sign $W$ boson pair production in association with two jets in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector

Abstract

This paper presents the measurement of fiducial and differential cross sections for both the inclusive and electroweak production of a same-sign $W$-boson pair in association with two jets ($W^{\pm }{W}^{\pm }jj$) using 139 fb${}^{-1}$ of proton-proton collision data recorded at a centre-of-mass energy of $\sqrt{s}=13$ TeV by the ATLAS detector at the Large Hadron Collider. The analysis is performed by selecting two same-charge leptons, electron or muon, and at least two jets with large invariant mass and a large rapidity difference. The measured fiducial cross sections for electroweak and inclusive $W^{\pm }{W}^{\pm }jj$ production are $2.92\pm 0.22\text{(stat.)}\pm 0.19\text{(syst.)}$ fb and $3.38\pm 0.22\text{(stat.)}\pm 0.19\text{(syst.)}$ fb, respectively, in agreement with Standard Model predictions. The measurements are used to constrain anomalous quartic gauge couplings by extracting 95% confidence level intervals on dimension-8 operators. A search for doubly charged Higgs bosons $H^{\pm \pm }$ that are produced in vector-boson fusion processes and decay into a same-sign $W$ boson pair is performed. The largest deviation from the Standard Model occurs for an $H^{\pm \pm }$ mass near 450 GeV, with a global significance of 2.5 standard deviations.

arXiv comment57 pages in total, author list starting page 42, 12 figures, 8 tables, published in JHEP. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2018-32/

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• Positively Identifying HEFT or SMEFT
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• Doubly charged Higgs boson at same-sign lepton colliders
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• Exotic Decays and Collider Signatures of pNGB Scalars in the $SU(5)/SO(5)$ Composite Higgs Model
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