Charming ALPs

A bstract Axion-like particles (ALPs) are ubiquitous in models of new physics explaining some the most pressing puzzles Standard Model. However, until relatively recently, little attention has been paid to its interplay with flavour. In this work, we study detail phenomenology ALPs that exclusively interact up-type quarks at tree-level, which arise well-motivated ultra-violet completions such as QCD-like dark sectors or Froggatt-Nielsen type Our is performed low-energy effective theory highlight key features these scenarios a model independent way. We derive all existing constraints on and demonstrate how upcoming experiments fixed-target facilities LHC can probe regions parameter space currently not excluded by cosmological astrophysical bounds. also emphasize future measurement unavailable meson decay D → π + invisible could complement searches.