QUOTING:
https://aeon.co/essays/how-physics-at-the-roots-of-reality-point-to-a-grand-unified-theory?
With the discovery of the Higgs boson in 2012, every elementary particle predicted by the Standard Model of physics has now been found.
Yet the field is far from ‘done’. Among the continuing work, physicists are still looking for a grand unified theory that explains the forces that operate at the subatomic level – a common understanding that accounts for the disparate phenomena we observe among the particles we have in hand.