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ALP searches with Flavour and Collider observables Abstract: Pseudo Nambu Goldstone bosons or axionlike particles (ALPs) can be light remnants of a heavy new physics sector. The UV structure of this sector determines the coupling structure of the ALPs. Light ALPs are strongly constrained from beam-dump searches and astrophysical observables and ALPs with masses close to the electroweak scale can be discovered with resonance searches. I will discuss different techniques to discover ALPs in the intermediate mass range with a special focus on long-lived ALPs. Flavour observables can be particularly relevant in this mass region and I will discuss the RGE running of ALP couplings from the UV scale to the low energy scale to show how flavor violating couplings are generated.