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Search for an invisibly decaying Higgs boson or dark matter candidates produced in association with a Z boson in pp collisions at √s=13 TeV with the ATLAS detector

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  • ATLAS Collaboration
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<mark>Journal publication date</mark>10/01/2018
<mark>Journal</mark>Physics Letters B
Volume776
Number of pages20
Pages (from-to)318-337
StatePublished
Original languageEnglish

Abstract

A search for an invisibly decaying Higgs boson or dark matter candidates produced in association with a leptonically decaying Z boson in proton–proton collisions at √s=13 TeV is presented. This search uses 36.1 fb−1 of data collected by the ATLAS experiment at the Large Hadron Collider. No significant deviation from the expectation of the Standard Model backgrounds is observed. Assuming the Standard Model ZH production cross-section, an observed (expected) upper limit of 67% (39%) at the 95% confidence level is set on the branching ratio of invisible decays of the Higgs boson with mass mH=125 GeV. The corresponding limits on the production cross-section of the ZH process with the invisible Higgs boson decays are also presented. Furthermore, exclusion limits on the dark matter candidate and mediator masses are reported in the framework of simplified dark matter models.

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Open Access funded by SCOAP³ - Sponsoring Consortium for Open Access Publishing in Particle Physics Under a Creative Commons license