Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-09-29
Phys.Rev. D69 (2004) 095006
Physics
High Energy Physics
High Energy Physics - Phenomenology
5 pages, Revtex4, 1 EPS figure. To appear in PRD: Minor changes. Appendix dropped
Scientific paper
10.1103/PhysRevD.69.095006
Triplet-mediated proton decay in Grand Unified Theories (GUTs) is usually suppressed by arranging a large triplet mass. Here we explore instead a mechanism for suppressing the couplings of the triplets to the first and second generations compared to the Yukawa couplings, so that the triplets' mass can be below the GUT scale. This mechanism is based on a ``triplet symmetry'' in the context of product-group GUTs. We study two possibilities. One, which requires the top Yukawa to arise from a non-renormalizable operator at the GUT scale, is that all triplet couplings to matter are negligible, so that the triplets can be at the weak scale. The second is that some triplet couplings, and in particular $T t b$ and $T \bar{t} \bar{l}$, are equal to the corresponding Yukawa couplings. This would give a distinct signature of grand unification if the triplets were sufficiently light. However, we derive a model-independent bound on the triplet mass in this case, which is at least 10$^6$GeV. Finally, we construct a GUT model based on Yukawa splitting, with the triplets at 10$^{14}$GeV, as required for coupling unification to work.
Rakshit Subhendu
Raz Guy
Roy Sourov
Shadmi Yael
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