53 research outputs found
Contextualizing the Higgs at the LHC
Recent excesses across different search modes of the collaborations at the
LHC seem to indicate the presence of a Higgs-like scalar particle at 125 GeV.
Using the current data sets, we review and update analyses addressing the
extent to which this state is compatible with the Standard Model, and provide
two contextual answers for how it might instead fit into alternative scenarios
with enlarged electroweak symmetry breaking sectors.Comment: Contribution to the proceedings of PLHC 2012, Vancouver, BC, June
4-9, 201
Superconformal Technicolor
In supersymmetric theories with a strong conformal sector, soft supersymmetry
breaking at the TeV scale naturally gives rise to confinement and chiral
symmetry breaking at the same scale. We investigate models where such a sector
dynamically breaks electroweak symmetry. We consider two scenarios, one where
the strong dynamics induces vacuum expectation values for elementary Higgs
fields, and another where the strong dynamics is solely responsible for
electroweak symmetry breaking. In both cases there is no fine tuning required
to explain the absence of a Higgs boson below the LEP bound, solving the
supersymmetry naturalness problem. A good precision electroweak fit can be
obtained, and quark and lepton masses are generated without flavor-changing
neutral currents. Electroweak symmetry breaking may be dominated either by the
elementary Higgs bosons or by the strong dynamics. In addition to standard
superymmetry collider signals, these models predict production of multiple
heavy standard model particles (t, W, Z, and b) from decays of resonances in
the strong sector.Comment: 4 pages; v2: minor changes, references adde
Early Higgs Hints for Non-Minimal Supersymmetry
We discuss the role that Higgs coupling measurements can play in
differentiating supersymmetric extensions of the Standard Model. Fitting
current LHC data to the Higgs couplings, we find that the likelihood fit shows
a preference in the direction of suppressed (enhanced) bottom (top) quark
couplings. In the minimal supersymmetric Standard Model, we demonstrate that
for tan beta > 1, there is tension in achieving such fermion couplings due to
the structure of the Higgs quartic couplings. In anticipation of interpreting
supersymmetric models with future data, we determine a single straightforward
condition required to access the region of coupling space preferred by current
data.Comment: 6 pages, 3 figures; v3: updated fits to include post-discovery data,
references and discussion modified accordingl
Goldstone Gauginos
Models of supersymmetry with Dirac gauginos provide an attractive scenario
for physics beyond the standard model. The "supersoft" radiative corrections
and suppressed SUSY production at colliders provide for more natural theories
and an understanding of why no new states have been seen. Unfortunately, these
models are handicapped by a tachyon which is naturally present in existing
models of Dirac gauginos. We argue that this tachyon is absent, with the
phenomenological successes of the model preserved, if the right handed gaugino
is a (pseudo-)Goldstone field of a spontaneously broken anomalous flavor
symmetry.Comment: 5 pages, 1 figure. v2: minor changes to text, references added and
update
Models of Goldstone Gauginos
Models with Dirac gauginos provide appealing scenarios for physics beyond the
standard model. They have smaller radiative corrections to the Higgs mass, a
suppression of certain SUSY production processes, and ameliorated flavor
constraints. Unfortunately, they also generally have tachyons, the solutions to
which typically spoil these positive features. The recently proposed "Goldstone
Gaugino" mechanism provides a simple solution that eliminates these tachyonic
states. We provide details on this mechanism and explore models for its origin.
In particular, we find SUSY QCD models that realize this idea simply, and
discuss scenarios for unification.Comment: 33 pages, 4 figure
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