523 research outputs found
Going Beyond the Minimal Composite Higgs Model
If electroweak symmetry breaking arises via strong dynamics, electroweak
precision tests and flavour physics experiments suggest that the minimal model
should closely resemble the Standard Model at the LHC. I describe two
directions going beyond the minimal model that result in radically different
physics at the LHC. One direction extends the Higgs sector and the other
involves composite leptoquark states.Comment: 5 pp.; contribution to the proceedings of Moriond 2010: EW
Interactions and Unified Theorie
Anomaly Holography
We consider, in the effective field theory context, anomalies of gauge field
theories on a slice of a five-dimensional, Anti-de Sitter geometry and their
four-dimensional, holographic duals. A consistent effective field theory
description can always be found, notwithstanding the presence of the anomalies
and without modifying the degrees of freedom of the theory. If anomalies do not
vanish, the d=4 theory contains additional pseudoscalar states, which are
either present in the low-energy theory as physical, light states, or are eaten
by (would-be massless) gauge bosons. We show that the pseudoscalars ensure that
global anomalies of the four-dimensional dual satisfy the 't Hooft matching
condition and comment on the relevance for warped models of electroweak
symmetry breaking.Comment: 26 pages, references adde
Improved Higgs Naturalness with Supersymmetry
We present a supersymmetric model of electroweak symmetry-breaking exhibiting
improved naturalness, wherein the stop mass can be pushed beyond the reach of
the Large Hadron Collider without unnatural fine tuning. This implies that
supersymmetry may still solve the hierarchy problem, even if it eludes
detection at the LHC.Comment: 4 pp., to appear in Proceedings of SUSY06, the 14th International
Conference on Supersymmetry and the Unification of Fundamental Interactions,
UC Irvine, California, 12-17 June 200
Superpotentials for Gauge and Conformal Supergravity Backgrounds
Effective superpotentials obtained by integrating out matter in super
Yang-Mills and conformal supergravity backgrounds in N=1 SUSY theories are
considered. The pure gauge and supergravity contributions (generalizing
Veneziano-Yankielowicz terms) are derived by considering the case with matter
fields in the fundamental representation of the gauge group. These
contributions represent quantum corrections to the tree-level Yang-Mills and
conformal supergravity actions. The classical equations of motion following
from the conformal supergravity action require the background to be
(super)conformally flat. This condition is unchanged by quantum corrections to
the effective superpotential, irrespective of the matter content of the theory.Comment: 12 pages, no figure
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