Testable Flipped SU(5) x U(1)(X) Models
Oct, 2006
24 pages
Published in:
- Nucl.Phys.B 772 (2007) 49-66
e-Print:
- hep-ph/0610054 [hep-ph]
Report number:
- ACT-07-06,
- MIFP-06-25,
- RUNHETC-06-24
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Abstract: (Elsevier)
The little hierarchy between the GUT scale and the string scale may give us some hints that can be tested at the LHC. To achieve string-scale gauge coupling unification, we introduce additional vector-like particles. We require that these vector-like particles be standard, form complete GUT multiplets, and have masses around the TeV scale or close to the string scale. Interestingly, only the flipped SU ( 5 ) × U ( 1 ) X models can work elegantly. We consider all possible sets of vector-like particles with masses around the TeV scale. And we introduce vector-like particles with masses close to the string scale which can mimic the string-scale threshold corrections. We emphasize that all of these vector-like particles can be obtained in the interesting flipped SU ( 5 ) × U ( 1 ) X string models from the four-dimensional free fermionic string construction. Assuming the low-energy supersymmetry, high-scale supersymmetry, and split supersymmetry, we show that the string-scale gauge coupling unification can indeed be achieved in the flipped SU ( 5 ) × U ( 1 ) X models. These models can be tested at the LHC by observing simple sets of vector-like particles at the TeV scale. Moreover, we discuss a simple flipped SU ( 5 ) × U ( 1 ) X model with string-scale gauge coupling unification and high-scale supersymmetry by introducing only one pair of the vector-like particles at the TeV scale, and we predict the corresponding Higgs boson masses. Also, we briefly comment on the string-scale gauge coupling unification in the model with low-energy supersymmetry by introducing only one pair of the vector-like particles at the intermediate scale. And we briefly comment on the mixings among the SM fermions and the corresponding extra vector-like particles.- 12.10.-g
- 11.25.Mj
- 12.10.Kt
- grand unified theory: SU(5) x U(1)
- supersymmetry: symmetry breaking
- coupling: gauge
- string model
- multiplet: vector
- Higgs particle: mass
- supersymmetry: split
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