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We study the LHC phenomenology of an Axion Like Particle (ALP) that couplesonly derivatively with the top quark at tree level. We inspect the radiativelyinduced couplings with the SM fermions and (gauge) bosons and the associatedproduction and decay mechanisms of the ALP. We focus on the most challengingmass window that remains open for a top-philic ALP, i.e., the range betweentens and hundreds of GeV. Not only ALP production processes but also virtualALP contributions to final states with top quarks are considered in detail. Weshow how searches through resonant production, such as ALP production inassociation with a $t\bar t$ pair, are complementary to precision measurementsof $t \bar t$ and $t\bar t t \bar t$ final states, the latter being competitiveor even more powerful for a top-philic ALP in this mass window. Finally, weexplore the scenario where the top-philic ALP acts as a mediator to adark-matter sector, resulting in missing energy signatures at the LHC. We findthat the LHC constraints from $t \bar t$, $t\bar t t \bar t$ and ALP + jetproduction, together with those from $t \bar t$ + ALP production, can alreadyexclude a large fraction of the parameter space leading to the correct relicabundance.

Top-philic ALP phenomenology at the LHC: the elusive mass-window