Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-10-10
JHEP 0812:095,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
17 figures
Scientific paper
10.1088/1126-6708/2008/12/095
We consider a supersymmetric Grand Unified Theory (GUT) based on the gauge group SO(10) suggested by Aulakh et al., which features two--step intermediate symmetry breaking, $SO(10) \to SU(4)_C \times SU(2)_L \times SU(2)_R \to SU(3)_C \times U(1)_{B-L} \times SU(2)_L \times SU(2)_R \to SU(3)_C \times SU(2)_L \times U(1)_Y$. {\bf $45, 54, 126+\overline{126}$} dimensional representations of Higgs superfields are employed to achieve this symmetry breaking chain. We also introduce a second, very heavy, pair of Higgs doublets, which modifies the Yukawa couplings of matter fields relative to minimal SO(10) predictions. We analyze the differences in the low energy phenomenology compared to that of mSUGRA, assuming universal soft breaking scalar masses, gaugino masses and trilinear couplings at the GUT scale. We find that thermal neutralino Dark Matter remains viable in this scenario, although for small and moderate values of $\tan\beta$ the allowed region is even more highly constrained than in mSUGRA, and depends strongly on the the light neutrino masses.
Drees Manuel
Kim Ju Min
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