Superstring Inspired Models and the Top Quark Mass
نویسندگان
چکیده
منابع مشابه
Top Quark Mass Prediction in Superstring Derived Standard–like Models
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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Four simple but realistic patterns of quark mass matrices are derived from orbifold models of superstring theory in the absence of gauge symmetries. Two of them correspond to the Ramond-Roberts-Ross types, which have five texture zeros in up and down quark sectors. The other two, with four texture zeros, preserve the structural parallelism between up and down sectors. The phenomenological conse...
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We consider top-anti-top production near threshold in e+e− collisions, resumming Coulomb-enhanced corrections at next-to-next-to-leading order (NNLO). We also sum potentially large logarithms of the small top quark velocity at the next-toleading logarithmic level using the renormalization group. The NNLO correction to the cross section is large, and it leads to a significant modification of the...
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We give a general prescription for deriving quark and lepton mass matrices with “texture” zeros in the framework of superstring inspired SO(10) models. The key to our approach is a new way to naturally implement the doublet–triplet splitting which enables us to obtain symmetric quark and lepton mass matrices which have different structures in the up and the down quark sectors. We illustrate our...
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ژورنال
عنوان ژورنال: Progress of Theoretical Physics
سال: 1988
ISSN: 0033-068X,1347-4081
DOI: 10.1143/ptp.79.502