927 research outputs found
Two Composite Higgs Doublets: Is it the Low Energy Limit of a Natural Strong Electroweak Symmetry Breaking Sector ?
In this paper, we construct an effective model that describes the electroweak
symmetry breaking sector by means of composite Higgs-like scalars, following
the ideas of Minimal Walking Technicolor (MWT). We argue that, because of the
general failure of Extended Technicolor (ETC) to explain the mass of the top
quark, it is necessary to introduce two composite Higgs bosons: one of them
originated by a MWT-ETC sector and the other one produced by a Topcolor sector.
We focus on the phenomenological differences between the light composite Higgs
present in our model and the fundamental Higgs boson predicted by the Standard
Model and their production at the LHC. We show that in this scheme the main
production channel of the lighter Higgs boson are the associated production
with a gauge boson and fusion but not the gluon-gluon fusion channel which
is substantially suppressed.Comment: Version accepted in Modern Physics Letters
Constraining Spin-One Color-Octet Resonances Using CDF and ATLAS Data
In this paper, we study the production of spin-one color-octet resonances
(colorons) at hadron colliders in a model independent way. We use dijets data
measured by CDF (at \sqrt{s}=1.96 TeV and L=1.13 TeV and L=315 1/nb) collaborations at the Tevatron and the LHC
respetively to impose limits on the coupling of colorons to fermions. We show
that CDF data still produce the more stringent limits on the coloron coupling
constant.Comment: Version accepted for publication in EPJC. Two paragraphs expanded and
new references adde
Associate Higgs and Gauge Boson Production at Hadron Colliders in a Model with Vector Resonances
Motivated by new models of dynamical electroweak symmetry breaking that
predict a light composite higgs boson, we build an effective lagrangian which
describes the Standard Model (with a light Higgs) and vector resonances. We
compute the cross section for the associate production of a higgs and a gauge
boson. For some values of model parameters we find that the cross section is
significantly enhanced with respect to the Standard Model. This enhancement is
similar at the LHC and the Tevatron for the same range of resonance mass
Axigluon Phenomenology using ATLAS dijet data
In recent years, there has been a renewed interest on axigluons as part of a
possible extension of strong interactions at high energies. In this work, we
use recent ATLAS measurements of the dijet spectrum in order to set limits on
the axigluon mass and coupling to quarks. We pay special attention to the
methodology used to extract the resonant contribution from theoretical
simulations. Finally, we present some predictions for the next LHC run at
TeV
Ultrasonic transducer with Gaussian radial pressure distribution
An ultrasonic transducer that produces an output that is a symmetrical function comprises a piezoelectric crystal with several concentric ring electrodes on one side of the crystal. A resistor network applies different amplitudes of an ac source to each of the several electrodes. A plot of the different amplitudes from the outermost electrode to the innermost electrode is the first half of a Gaussian function. Consequently, the output of the crystal from the side opposite the electrodes has a Gaussian profile
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