Article

# Sliding singlet mechanism reexamined

Physical Review D (Impact Factor: 4.69). 01/2003; 68(5). DOI: 10.1103/PhysRevD.68.055001

Source: arXiv

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**ABSTRACT:**The grand unified theories are theoretically well motivated, but they typically have less direct indications on the low energy physics and it is not easy to test them. Here, we discuss a scenario of them which naturally solves the so-called doublet-triplet splitting problem and, at the same time, generally predicts characteristic collider phenomenology. Then, we may get a hint on the breaking of the grand unified symmetry at the on-going and next-generation collider experiments.04/2013; -
##### Article: Embedding Flipped SU(5) into SO(10)

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**ABSTRACT:**We embed the flipped SU(5) models into the SO(10) models. After the SO(10) gauge symmetry is broken down to the flipped SU(5) \times U(1)_X gauge symmetry, we can split the five/one-plets and ten-plets in the spinor \mathbf{16} and \mathbf{\bar{16}} Higgs fields via the stable sliding singlet mechanism. As in the flipped SU(5) models, these ten-plet Higgs fields can break the flipped SU(5) gauge symmetry down to the Standard Model gauge symmetry. The doublet-triplet splitting problem can be solved naturally by the missing partner mechanism, and the Higgsino-exchange mediated proton decay can be suppressed elegantly. Moreover, we show that there exists one pair of the light Higgs doublets for the electroweak gauge symmetry breaking. Because there exist two pairs of additional vector-like particles with similar intermediate-scale masses, the SU(5) and U(1)_X gauge couplings can be unified at the GUT scale which is reasonably (about one or two orders) higher than the SU(2)_L \times SU(3)_C unification scale. Furthermore, we briefly discuss the simplest SO(10) model with flipped SU(5) embedding, and point out that it can not work without fine-tuning. Comment: RevTex4, 28 pages, 3 figures, typos correctedJournal of High Energy Physics 06/2006; · 5.62 Impact Factor -
##### Article: CP Asymmetries of B --> ø KS and B -->eta' KS in SUSY GUT Model with Non-Universal Sfermion Masses

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**ABSTRACT:**We analyze CP asymmetries of B to phi K_S and B to eta' K_S in a supersymmetric grand unified theory in which only the third generation sfermions contained in 10 (Q, U^c, E^c) of SU(5) can have a different mass from the others. One of the advantages of this nonuniversal mass model is that the first two generation sfermion masses can be large whereas both (left and right handed) stops are light so as to stabilize the weak scale. Therefore, we studied a minimal supersymmetric standard model parameter region in which a fine tuning in Higgs sector is relaxed owing to light masses of stops, gluino and higgsinos. In such a parameter region, the chargino contribution is as important as the gluino one. We show that the CP asymmetries of B to phi K_S and B to eta' K_S can deviate from their standard model predicted values by O(0.1) because of constructive interference between gluino and chargino contributions.Progress of Theoretical Physics 01/2009; 121:49-72. · 2.48 Impact Factor

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