Search for dark matter particles in W${}^{+}$W${}^{-}$ events with transverse momentum imbalance in proton-proton collisions at $\sqrt{s}$ = 13 TeV

Abstract

A search for dark matter particles is performed using events with a pair of W bosons and large missing transverse momentum. Candidate events are selected by requiring one or two leptons ($\ell =$ electrons or muons). The analysis is based on proton-proton collision data collected at a center-of-mass energy of 13 TeV by the CMS experiment at the LHC and corresponding to an integrated luminosity of 138 fb${}^{-1}$. No significant excess over the expected standard model background is observed in the $\ell \nu$qq and 2$\ell$2$\nu$ final states of the W${}^{+}$W${}^{-}$ boson pair. Limits are set on dark matter production in the context of a simplified dark Higgs model, with a dark Higgs boson mass above the W${}^{+}$W${}^{-}$ mass threshold. The dark matter phase space is probed in the mass range 100-300 GeV, extending the scope of previous searches. Current exclusion limits are improved in the range of dark Higgs masses from 160 to 250 GeV, for a dark matter mass of 200 GeV.

Replaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/EXO-21-012 (CMS Public Pages)

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