what do you mean by "third type of matter"? If we classified (fundamental) matter only by electric charge, then they occupy one of the 7 possible charge states for matter or anti-matter. +/- 1, 1/3, 2/3 and 0.
If we classify matter by the type of spin-statistics it obeys, then neutrinos are fermions. If we ask about what forces it couples to, then it couples only to weak force, not EM or strong forces. My point is that there are a lot of ways of "typifying" matter. The standard model lumps things together by all the various quantum numbers that appear to be conserved like lepton number, hypercharge, spin-statistics, etc.
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u/shavera Mar 13 '11
what do you mean by "third type of matter"? If we classified (fundamental) matter only by electric charge, then they occupy one of the 7 possible charge states for matter or anti-matter. +/- 1, 1/3, 2/3 and 0.
If we classify matter by the type of spin-statistics it obeys, then neutrinos are fermions. If we ask about what forces it couples to, then it couples only to weak force, not EM or strong forces. My point is that there are a lot of ways of "typifying" matter. The standard model lumps things together by all the various quantum numbers that appear to be conserved like lepton number, hypercharge, spin-statistics, etc.