Wednesday, January 21, 2015

particle physics - Why do fermions come in generations, but not bosons?


Why does the $1/2$ spin of fundamental fermions (electrons, quarks, and neutrinos) split them into three variants that differ only in mass, while the integer spins of massless fundamental bosons (e.g. photons and gluons) causes no such splitting?


If the bosons had mass, would they also split into three generations?




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