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.
Highlights
The observation of the Higgs boson at the LHC [1,2] signified a success of the Standard Model (SM), and opened a unique opportunity to search for new physics
This Letter reports a search for an invisibly decaying Higgs boson with mH = 125 GeV or weakly interacting massive particles (WIMPs) produced in association with a Z boson using 36.1 fb−1 of data collected by the ATLAS detector in
This Letter presents a search for an invisibly decaying Higgs boson or WIMPs produced in association with a Z boson using
Summary
The observation of the Higgs boson at the LHC [1,2] signified a success of the Standard Model (SM), and opened a unique opportunity to search for new physics. Constraints on B H→inv can be inferred from the visible decay channels, and an upper limit of 34% was obtained using LHC Run-1 data [28]. This Letter reports a search for an invisibly decaying Higgs boson with mH = 125 GeV or WIMPs produced in association with a Z boson using 36.1 fb−1 of data collected by the ATLAS detector in. Exclusion limits on the WIMP mass (mχ ) and the mediator mass (mmed) can be set [16], which indicated that LHC searches can be more sensitive than direct searches to WIMP production in this particular model with an axial-vector mediator.
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