Publications (4)0 Total impact
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ABSTRACT: The recent conjecture of possible equivalence between the string scale MS and the minimal supersymmetric standard model unification scale MU≈2.5×1016 GeV is considered in the context of string models. This conjecture suggests that the observable gauge group just below the string scale should be SU(3)C×SU(2)L×U(1)Y and that the SU(3)C×SU(2)L×U(1)Y-charged spectrum of the observable sector should consist solely of the MSSM spectrum. We demonstrate that string models can actually be constructed that possess these observable features. Two aspects generic to many classes of three family SU(3)C×SU(2)L×U(1)Y string models are both an extra local anomalous U(1)A and numerous (often fractionally charged) exotic particles beyond the MSSM. Thus, for these classes, the key to obtaining an MS=MU≈2.5×1016 GeV string model is the existence of F- and D-flat directions that near the string scale can simultaneously break the anomalous U(1) and give mass to all exotic SM-charged observable particles, decoupling them from the low energy spectrum. In this letter we show, in the context of free fermionic strings, that string models with flat directions possessing these features do exist. We present one such string derived model in which all such exotic observable states beyond the MSSM receive mass at the scale generated by the Fayet–Iliopoulos term. The associated F- and D-flat direction is proven flat to all orders of the superpotential.
Physics Letters B.
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S Kuhlman,
C E Adolphsen,
R Aiello,
M. Akemoto,
R. Alley,
R W Assmann,
Howard W Baer,
C Baltay,
Karl Leopold Freitag Bane,
B Barakat, [......],
M Woods,
J. Wudka,
J S Wurtele,
M Xie,
Y.T. Yan,
A D Yeremian,
K. Yokoya,
S S Yu,
A.A. Zholents,
Frank Zimmermann
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ABSTRACT: We present the current expectations for the design and physics program of an e+e- linear collider of center of mass energy 500 GeV -- 1 TeV. We review the experiments that would be carried out at this facility and demonstrate its key role in exploring physics beyond the Standard Model over the full range of theoretical possibilities. We then show the feasibility of constructing this machine, by reviewing the current status of linear collider technology and by presenting a precis of our `zeroth- order' design.
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ABSTRACT: Recently, we presented the first non-Abelian flat directions that produce from a heterotic string model solely the three-generation MSSM states as the massless spectrum in the observable sector of the low energy effective field theory. In this paper we continue to develop the systematic techniques for the analysis of non-renormalizable superpotential terms and non-Abelian flat direction in realistic string models. Some of our non-Abelian directions were F-flat to all finite orders in the superpotential. We study for the same string model the varying phenomenologies resulting from a large set of such all-order flat directions. We focus on the quark, charged lepton, and Higgs doublet mass matrices resulting for our phenomenologically superior non-Abelian flat direction. We review and apply a string-related method for generating large mass hierarchies between MSSM generations, first discussed in string-derived flipped SU(5) models, when all generational mass terms are of renormalizable or very low non-renormalizable order.
Nuclear Physics B.
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ABSTRACT: We present a systematic classification of field directions for the string-derived flipped SU(5) model that are D- and F-flat to all orders. Properties of the flipped SU(5) model with field values in these directions are compared to those associated with other flat directions that have been shown to be F-flat to specific finite orders in the superpotential. We discuss the phenomenological Higgs spectrum, and quark and charged-lepton mass textures.
Nuclear Physics B.
