When physicists say "baryonic matter" that's more or less just shorthand for "atomic matter". Atoms are made up of protons, neutrons, and electrons. Between th

When physicists say "baryonic matter" that's more or less just shorthand for "atomic matter". Atoms are made up of protons, neutrons, and electrons. Between the 3 types of particles the mass of the protons and neutrons outweighs that of the electrons by about 3 orders of magnitude, almost all of the mass is in the nuclear particles. And those particles are baryons, they are, in fact, the lightest baryons, each made up of 3 quarks. Only the proton and anti-proton baryons are stable in isolation, but in nuclei protons plus neutrons can be stable together and anti-protons plus anti-neutrons can also be stable together.