4 research outputs found
On Lattice QCD with Many Flavors
We discuss the confining and chiral-symmetry breaking properties of QCD with
a large number of flavors . In a Monte Carlo simulation of QCD with staggered fermions, we find clear evidence of a first order bulk phase
transition which separates phases with broken and unbroken chiral symmetry.
This is consistent with extrapolations of earlier studies with smaller ,
and is also as expected from general arguments. Thus, even when the
perturbative renormalization group flow has a new infrared stable fixed point
near the origin, lattice artifacts induce chiral symmetry breaking, and
presumably confinement, at sufficiently strong coupling.Comment: 10 pages, LaTeX, figures part of the LaTeX fil
Selected Topics on Rare Kaon Processes - in the Standard Model and Supergravity -
Rare kaon processes appear to be particularly suitable to study the
extensions of the standard model, especially if the possibility for eventual
direct evidence becomes unlikely. In this review, we discuss processes that are
important as a test of either the standard model or supergravity. Moreover,
some of these are important even for both the standard model and for
supergravity. Particular attention is paid to the reduction of uncertainties in
the calculation, especially the ones coming from the confinement effects.
Recent approaches, such as chiral perturbation theory, the large
-expansion, QCD sum rules and lattice QCD, are discussed. This is found to
be the best strategy in view of the fact that supersymmetric effects are rather
tiny.Comment: 52 pages (14 figures available upon request), LaTex, LMU-TP 7/89,
RBI-TP 4/89, final version July 1992, to be published in Fortschritte der
Physi
Signatures of Higgs triplet representations at TeV e+ e- colliders
We investigate the potential of future TeV linear e^+e^- colliders to observe
singly-charged Higgs bosons () via the coupling , which
would signal the existence of exotic Higgs representations. In the context of a
Higgs-triplet model compatible with the electroweak oblique parameters, we
estimate the cross section for pro- ducing charged Higgs-triplet bosons that
couple predominantly to and bosons in 0.5--2 TeV- colliders.
The principal backgrounds are evaluated and the viability of the signal is
discussed and illustrated.Comment: LaTeX, 20 pages, 4 figure