  Axion Like Particles (ALPs) belong to a well motivated class of particles
which are part of a more complete UV theory. In this work, we initiate and
present the inclusion of such ALPs or the conventional axions in the Heavy
Hadron Chiral Perturbation Theory (HHChiPT) in a model independent effective
lagrangian way. Such a framework is well suited for studying heavy to heavy
quark flavour preserving transitions. For light ALPs, the limits on the ALP
couplings (or their combinations) turn out to be independent of ALP mass.
Radiative and leptonic decays of heavy vector mesons to corresponding heavy
pseudoscalar mesons will be able to provide some of the most stringent
constraints on ALPs, particularly the diagonal couplings.
