Search for heavy resonances decaying into $WW$ in the $e\nu \mu \nu$ final state in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector

Abstract

A search for neutral heavy resonances is performed in the $WW\to e\nu \mu \nu$ decay channel using $pp$ collision data corresponding to an integrated luminosity of 36.1 fb${}^{-1}$, collected at a centre-of-mass energy of 13 TeV by the ATLAS detector at the Large Hadron Collider. No evidence of such heavy resonances is found. In the search for production via the quark--antiquark annihilation or gluon--gluon fusion process, upper limits on ${\sigma }_X\times B(X\to WW)$ as a function of the resonance mass are obtained in the mass range between 200 GeV and up to 5 TeV for various benchmark models: a Higgs-like scalar in different width scenarios, a two-Higgs-doublet model, a heavy vector triplet model, and a warped extra dimensions model. In the vector-boson fusion process, constraints are also obtained on these resonances, as well as on a Higgs boson in the Georgi--Machacek model and a heavy tensor particle coupling only to gauge bosons.

50 pages in total, author list starting page 34, 12 figures, 7 tables, published version, all figures including auxiliary figures are available at: https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2016-31

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