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.
The Feynman diagrams relevant to this process pp → hN Nshares the same topology as the previous ALP process and thus sim- ilar to those in FIG 1
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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.