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" ... There are all sorts of particles that have previously been discovered that are analogous to this. The rho mesons, for example, have a mass of ~775 MeV/c², decaying into pions (with the same quark-antiquark composition but less than 20% the mass) after about 10-23 seconds. The delta baryons are all made exclusively of up and down quarks but with a mass of 1232 MeV/c²: about 300 MeV/c² heavier than protons and neutrons, which they decay into after about 10-23 seconds. ... "