Z boson in pp collisions at s = 13 ? TeV with the ATLAS detector]]>

摘要

AbstractA search for an invisibly decaying Higgs boson or dark matter candidates produced in association with a leptonically decayingZboson in proton–proton collisions ats=13?TeVis presented. This search uses36.1?fb?1of 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 ModelZHproduction 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 massmH=125?GeV. The corresponding limits on the production cross-section of theZHprocess with the invisible Higgs boson decays are also presented. Furthermore, exclusion limits on the dark matter candidate and mediator masse