Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1997-10-28
Phys.Lett. B418 (1998) 141-144
Physics
High Energy Physics
High Energy Physics - Phenomenology
6 pages, LateX
Scientific paper
10.1016/S0370-2693(97)01416-0
The hypercharges of the fermions are not uniquely determined in SO(10) grand unification, but rather depend upon which linear combination of the two U(1) subgroups of SO(10) > SU(3) X SU(2) X U(1) X U(1) remains unbroken. We show that, in general, a given hypercharge assignment can be obtained only with very high-dimensional Higgs representations. The observation that the standard model is obtained with low-dimensional Higgs representations can therefore be regarded as further evidence for SO(10) grand unification. This evidence is independent of the fact that SO(10) > SU(5).
Lykken Joseph
Montroy Thomas
Willenbrock Scott
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