1,659 research outputs found
Abelian Flavour Symmetries in Supersymmetric Models
We propose a theory of flavour based on abelian horizontal gauge symmetries
and modular invariances. We construct explicit supergravity models where the
scale of the horizontal symmetry breaking is fixed by the Green-Schwarz
mechanism for anomaly cancellation. The supersymmetric spectrum is obtained in
terms of the charges which are determined by the Yukawa matrices.Comment: 30 pages, LaTeX, no figure
Exactly Solvable (0,2) Supersymmetric String Vacua With GUT Gauge Groups
We present a construction of modular invariant partition functions for
heterotic (0,2) supersymmetric classical string vacua. This generalization of
Gepner's construction yields GUT gauge groups E_6, SO(10), SU(5) and SU(3) x
SU(2) x U(1)^r, respectively. By calculating the massless spectrum of some of
these models we find strong indications that they correspond to (0,2) string
vacua discussed recently in the context of CYM/LG phases.Comment: PlainTeX, 23 pages, no figures, final version to appear in Nucl.
Phys. B, some minor corrections, complete list of changes at the top of the
TeX fil
More about discrete symmetries in compactified string theories
We discuss discrete symmetries in several string compactification schemes.
The same constraints on the light spectra as for Gepner models \cite{rosss} are
found in various cases for non- symmetries. The analogous constraints for
symmetries are also established.Therefore it seems natural to conjecture
that they always apply.Comment: 10 pages, OUTP-93-15
Exotic Top Partners and Little Higgs
Little Higgs models often give rise to top partners beyond the minimal ones
necessary for the cancellation of quadratic divergences. We review how this
occurs and discuss the phenomenology of these exotic states. We emphasize the
possible importance of new pseudo-Nambu-Goldstone bosons in top partner decays.
Indeed, cascade decays of exotic top partners may be the best way to discover
these new bosons. We illustrate these points with a new Little Higgs
construction based on an SO(10)/SO(5)^2 coset structure, which fills a gap in
the model building literature. These observations motivate new search
strategies for top partners at the LHC, including for final states with b-jets
and a large multiplicity of electroweak bosons.Comment: 27 pages, 2 figures, 4 tables; v3: JHEP revision -- updated to
include discussion of naturalness and section 2.1 expande
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