Generation mass hierarchy in superstring derived models
نویسندگان
چکیده
منابع مشابه
Generation Mass Hierarchy in Superstring Derived Models
I discuss the problem of generation mass hierarchy in the context of realistic superstring models which are constructed in the free fermionic formulation. These models correspond to models which are compactified on Z2 × Z2 orbifold. I suggest that the hierarchy among the generations results from horizontal symmetries, which arise from the compactification. In particular, I show that in a class ...
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A remarkable achievement of the realistic superstring standard–like models is the successful prediction of the top quark mass, assuming the Minimal Supersymmetric Standard Model spectrum below the string scale. Recently it was shown that string scale unification requires the existence of additional matter, in vector–like representations, at intermediate energy scales and that certain string mod...
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The ALEPH collaboration has recently reported a significant excess of fourjet events at the LEP 1.5 and LEP 2 experiments. While not yet confirmed by the other collaborations, i t was recently proposed that this excess may be explained by certain R-parity violating operators in supersymmetric models. R-parity violating operators introduce the danger of inducing rapid proton decay. I discuss how...
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ژورنال
عنوان ژورنال: Nuclear Physics B
سال: 1993
ISSN: 0550-3213
DOI: 10.1016/0550-3213(93)90273-r