118 research outputs found
Two Universal Extra Dimensions
We review the main results of the study of the Standard model propagating in
two universal extra dimensions. Gauge bosons give rise to heavy spin-1 and
spin-0 particles. The latter constitute the lightest Kaluza-Klein (KK) particle
in the level (1,0). The level (1,1) can be s-channel produced. The main signals
at the Tevatron and the LHC will be several resonances.Comment: 4 pages, 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
Theories with Extra Dimensions
We review some aspects of theories with compact extra dimensions. We consider
the motivation and the theoretical basis of Large, Universal and Warped Extra
Dimensions. We focus on those aspects that are potentially relevant in the
phenomenology at colliders.Comment: 10 pages, 9 figures, Presented at The 15th International Conference
on Hadron Collider Physics, East Lansing, MI, June 14-18 200
Constraints on Semileptonic Form-factors from Dispersive Sum Rules
I briefly discuss the derivation of dispersive sum rules constraining
semileptonic form-factors. I outline the use of these constraints in the
context of charmless semileptonic decays and suggest how, in combination with
other theoretical and experimental information, they may reduce the
uncertainties in the extraction of .Comment: 6 pages, 1 ps figure included. Uses sprocl.sty. Talk presented at the
2nd Conference on B Physics and CP Violation, Honolulu, Hawaii, March 24-27
199
New Solutions to the Hierarchy Problem
After summarizing the status of the Standard Model, we focus on the Hierarchy
Problem and why we believe this strongly suggests the need for new physics at
the TeV scale. We then concentrate on theories with extra dimensions and their
possible manifestations at this scale.Comment: Presented at the First Latin American Workshop on High Energy
Physics, Porto Alegre, December 3-5 200
Theoretical Issues in Rare K, D and B Decays
I discuss some theoretical aspects of rare , and decays focusing
mainly on their potential as tests of the one loop structure of the standard
model. I concentrate on flavor changing neutral current processes and compare
our ability to extract short distance physics in the three cases. Finally, I
give some examples of the sensitivity of these decays to extensions of the
standard model.Comment: 12 pages, 4 figures. Talk presented at the Workshop on Heavy Quarks
at Fixed Target, Fermilab, Batavia IL, October 10-12, 199
Fermion Resonances in Quiver Theories with a pNGB Higgs
Hierarchical quiver models can be used to build theories of electroweak
symmetry breaking and natural models of flavor with a pseudo--Nambu-Goldstone
boson (pNGB) Higgs. They are cousins of similar models in extra-dimensional
theories in anti--de Sitter backgrounds, and can be obtained from them by
coarse deconstruction. We consider the fermion excitations in these models,
focusing on the quark sector and studying its generic features and
phenomenology. We show that, unlike in the continuum case, the spectrum is
strongly flavor dependent. To study the phenomenology of the quark excitations
we compute their couplings to the Higgs sector and the gauge excitations which
determine both their single-production and their decays. We show how the
generic features of quiver theories with a pNGB Higgs translate, through the
spectrum of quark excitations and their couplings, into a distinct
phenomenology at the LHC.Comment: 21 pages, 11 figure
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