150 research outputs found
Testing Technicolor with Scalars at the First Muon Collider
An interesting class of models of dynamical electroweak symmetry breaking
allows only the third generation fermions to acquire dynamical masses, such
that the masses of the first two generations should be given by coupling to a
nonstandard ``Higgs'' doublet. The scalars in this case have large couplings to
the second generation, so that they are copiously produced at a muon collider.
We analyze the potential for discovery of the neutral scalars in the
-channel, and we show that at resonance there will be observed in excess of
events per year.Comment: 8 pages, latex, aipproc.st
Unscrambling New Models for Higher-Energy Physics
There is strong evidence that new physical degrees of freedom and new
phenomena exist and may be revealed in future collider experiments. The best
hints of what this new physics might be are provided by electroweak symmetry
breaking. I briefly review certain theories for physics beyond the standard
model, including the top-quark seesaw model and universal extra dimensions. A
common feature of these models is the presence of vector-like quarks at the TeV
scale. Then I discuss the role of a linear collider in disentangling
this new physics.Comment: 10 pages, LaTeX, uses aipproc.cls and aipproc.sty. Plenary talk given
at the 5th International Linear Collider Workshop, Fermilab, Oct. 24-28, 200
Negative contributions to S in an effective field theory
We show that an effective field theory that includes non-standard couplings
between the electroweak gauge bosons and the top and bottom quarks may yield
negative contributions to both the S and T oblique radiative electroweak
parameters. We find that that such an effective field theory provides a better
fit to data than the standard model (the chi-squared per degree of freedom is
half as large). We examine in some detail an illustrative model where the
exchange of heavy scalars produces the correct type of non-standard couplings.Comment: 12 pages, 1 fig., LaTeX, typos corrected, improved referencin
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