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We study the interactions of Axion-Like Particles (ALPs) with the StandardModel particles, aiming to probe their phenomenology via non-resonant searchesat the LHC. These interactions are mediated by higher dimensional effectiveoperators within two possible frameworks of linearly and non-linearly realisedelectroweak symmetry breaking. We consider the ALPs to be light enough to beproduced on-shell and exploit their derivative couplings with the SM Higgsboson and the gauge bosons. We will use the high momentum transfer processes,namely $hZ, Z\gamma, WW$ and $WW\gamma$ production from $pp$ collisions. Wederive upper limits on the gauge-invariant interactions of ALPs with theelectroweak bosons and/or Higgs boson that contribute to these processes, fromthe re-interpretation of the latest Run 2 available LHC data. The constraintswe obtain are strong for ALP masses below 100 GeV. These allowed effectiveinteractions in the ALP parameter space yield better significance at HL-LHC andthus, offer promising avenues for subsequent studies. Furthermore, we augmentour cut-based analysis with gradient-boosted decision trees, which improve thestatistical significance distinctly across these interaction channels. Webriefly compare the results with the complementary probe of these couplings viadirect production of ALPs in association with the Higgs boson or a vectorboson.

Probing the Interactions of Axion-Like Particles with Electroweak Bosons and the Higgs Boson in the High Energy Regime at LHC