15 . Grand Unified Theories


In spite of all the successes of the Standard Model [SM], it is unlikely to be the final theory. It leaves many unanswered questions. Why the local gauge interactions SU(3) C × SU(2) L × U(1) Y , and why 3 families of quarks and leptons? Moreover, why does one family consist of the states [Q, u c , d c ; L, e c, where Q = (u, d), and L = (ν, e) are SU(2) L… (More)


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