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- W2013132133 abstract "We look for the minimal particle content which is necessary to add to the standard model in order to have a complete unification of gauge couplings and gravity at the weakly coupled heterotic string scale. Using the current precision electroweak data, we find that the presence of a vector-like fermion at an intermediate scale and a non-standard hypercharge normalization are in general sufficient to achieve this goal at two-loop level. If one requires the extra matter scale to be below the TeV scale, then it is found that the addition of three vector-like fermion doublets with a mass around 700 GeV yields a perfect string-scale unification, provided that the affine levels are kY=13/3, k2=1 and k3=2, as in the SU(5) X SU(5) string-GUT. Furthermore, if supersymmetry is broken at the unification scale, the Higgs mass is predicted in the range 125 GeV - 170 GeV, depending on the precise values of the top quark mass and tan(beta) parameter." @default.
- W2013132133 created "2016-06-24" @default.
- W2013132133 creator A5046780826 @default.
- W2013132133 creator A5052484201 @default.
- W2013132133 date "2005-09-01" @default.
- W2013132133 modified "2023-09-25" @default.
- W2013132133 title "Minimal string-scale unification of gauge couplings" @default.
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- W2013132133 doi "https://doi.org/10.1016/j.physletb.2005.07.038" @default.
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