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Quick question: I just read in a PhD thesis that there are 48 fermions. I count 6 quarks + 3 leptons + 3 neutrinos times 2 for anti-particles = 24 fermions. Am I missing something?

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    $\begingroup$ Depends on how you count, but I guess they were counting the three colors of each quark as distinct particles. $\endgroup$
    – Javier
    Dec 9, 2015 at 1:07
  • $\begingroup$ Did the paper involve SUSY? $\endgroup$
    – user73352
    Dec 9, 2015 at 1:30
  • $\begingroup$ @Jake - This was a statement regarding the SM. I believe the extra 24 fermions is simply due to taking into account the quark color as mentioned by Javier. $\endgroup$
    – DaYu1729
    Dec 9, 2015 at 1:44

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Quarks come in 6 flavors and 3 colors, which gives us 18 unique quarks.Add 6 leptons to get total of 24 matter fermions.And double the number for antimatter to get total of 48 fermions in SM.

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