BSM (or
Beyond the Standard Model) problems are the set of problems that do not find their resolution in the framework of the Standard Model of the elementary particle physics. Among these problems one the phenomenon of
neutrino oscillations, the nature of
dark matter and
dark energy; the particle(s) resposible for
inflation; the mechanism of generation of generation of the
baryon asymmetry of the Universe.
It is customary to add to this list a number of
fine-tunning problems, most notable
gauge hierarchy problem (but also CP problem, cosmological constant problem)