The mono-Higgs plus missing energy signature sets 95% CL bounds on the ALP-Higgs coupling CaH/Lambda^2 and the sterile neutrino-Higgs coupling lambda3/M*, but these bounds are weaker than existing limits from invisible Higgs decays.
We set the ALP-gauge boson couplings to unity, i.e., Cγγ = CGG = 1 and Cf = 0
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Unveiling the Invisible: ALPs and Sterile Neutrinos at the LHC and HL-LHC
The mono-Higgs plus missing energy signature sets 95% CL bounds on the ALP-Higgs coupling CaH/Lambda^2 and the sterile neutrino-Higgs coupling lambda3/M*, but these bounds are weaker than existing limits from invisible Higgs decays.