8 research outputs found
Gaugino-Assisted Anomaly Mediation
We present a model of supersymmetry breaking mediated through a small extra
dimension. Standard model matter multiplets and a supersymmetry-breaking (or
``hidden'') sector are confined to opposite four-dimensional boundaries while
gauge multiplets live in the bulk. The hidden sector does not contain a singlet
and the dominant contribution to gaugino masses is via anomaly-mediated
supersymmetry breaking. Scalar masses get contributions from both anomaly
mediation and a tiny hard breaking of supersymmetry by operators on the
hidden-sector boundary. These operators contribute to scalar masses at one loop
and in most of parameter space, their contribution dominates. Thus it is easy
to make all squared scalar masses positive. As no additional fields or
symmetries are required below the Planck scale, we consider this the simplest
working model of anomaly mediation. The gaugino spectrum is left untouched and
the phenomenology of the model is roughly similar to anomaly mediated
supersymmetry breaking with a universal scalar mass added. We identify the main
differences in the spectrum between this model and other approaches. We also
discuss mechanisms for generating the mu term and constraints on additional
bulk fields.Comment: LaTeX, 26 pages, 8 eps figure
Fermion Masses and Gauge Mediated Supersymmetry Breaking from a Single U(1)
We present a supersymmetric model of flavor. A single U(1) gauge group is
responsible for both generating the flavor spectrum and communicating
supersymmetry breaking to the visible sector. The problem of Flavor Changing
Neutral Currents is overcome, in part using an `Effective Supersymmetry'
spectrum among the squarks, with the first two generations very heavy. All
masses are generated dynamically and the theory is completely renormalizable.
The model contains a simple Froggatt-Nielsen sector and communicates
supersymmetry breaking via gauge mediation without requiring a separate
messenger sector. By forcing the theory to be consistent with SU(5) Grand
Unification, the model predicts a large tan beta and a massless up quark. While
respecting the experimental bounds on CP violation in the K-system, the model
leads to a large enhancement of CP violation in B-(B bar) mixing as well as in
B decay amplitudes.Comment: LaTeX, 25 pages, 8 figure
Supersymmetry Breaking through Transparent Extra Dimensions
We propose a new framework for mediating supersymmetry breaking through an
extra dimension. It predicts positive scalar masses and solves the
supersymmetric flavor problem. Supersymmetry breaks on a ``source'' brane that
is spatially separated from a parallel brane on which the standard model matter
fields and their superpartners live. The gauge and gaugino fields propagate in
the bulk, the latter receiving a supersymmetry breaking mass from direct
couplings to the source brane. Scalar masses are suppressed at the high scale
but are generated via the renormalization group. We briefly discuss the
spectrum and collider signals for a range of compactification scales.Comment: 20 page
Phenomenology of flavor-mediated supersymmetry breaking
The phenomenology of a new economical SUSY model that utilizes dynamical SUSY
breaking and gauge-mediation (GM) for the generation of the sparticle spectrum
and the hierarchy of fermion masses is discussed. Similarities between the
communication of SUSY breaking through a messenger sector, and the generation
of flavor using the Froggatt-Nielsen (FN) mechanism are exploited, leading to
the identification of vector-like messenger fields with FN fields, and the
messenger U(1) as a flavor symmetry. An immediate consequence is that the first
and second generation scalars acquire flavor-dependent masses, but do not
violate FCNC bounds since their mass scale, consistent with effective SUSY, is
of order 10 TeV. We define and advocate a minimal flavor-mediated model (MFMM),
recently introduced in the literature, that successfully accommodates the small
flavor-breaking parameters of the standard model using order one couplings and
ratios of flavon field vevs. The mediation of SUSY breaking occurs via two-loop
log-enhanced GM contributions, as well as several one-loop and two-loop
Yukawa-mediated contributions for which we provide analytical expressions. The
MFMM is parameterized by a small set of masses and couplings, with values
restricted by several model constraints and experimental data. The
next-to-lightest sparticle (NLSP) always has a decay length that is larger than
the scale of a detector, and is either the lightest stau or the lightest
neutralino. Similar to ordinary GM models, the best collider search strategies
are, respectively, inclusive production of at least one highly ionizing track,
or events with many taus plus missing energy. In addition, D^0 - \bar{D}^0
mixing is also a generic low energy signal. Finally, the dynamical generation
of the neutrino masses is briefly discussed.Comment: 54 pages, LaTeX, 8 figure