49 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
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
On the Quantum Chromodynamics of a Massive Vector Field in the Adjoint Representation
In this paper, we explore the possibility of constructing the quantum
chromodynamics of a massive color-octet vector field without introducing higher
structures like extended gauge symmetries, extra dimensions or scalar fields.
We show that gauge invariance is not enough to constraint the couplings.
Nevertheless the requirement of unitarity fixes the values of the coupling
constants, which otherwise would be arbitrary. Additionally, it opens a new
discrete symmetry which makes the coloron stable and avoid its resonant
production at a collider. On the other hand, a judicious definition of the
gauge fixing terms modifies the propagator of the massive field making it
well-behaved in the ultra-violet limit. The relation between our model and the
more general approach based on extended gauge symmetries is also discussed.Comment: Subsection 2.1 rewritten in order to make it more pedagogical. This
version match the text accepted in IJMP
Limits on a Strong Electroweak Sector from e^+ e^- -> 2gamma + missing E at LEP2
We study the process in the context
of a strong electroweak symmetry breaking model, which can be a source of
events with two photons and missing energy at LEP2. We investigate bounds on
the model assuming that no deviation is observed from the Standard Model within
a given experimental error.Comment: 7 pages, Latex, one figur
Personal Space at Parkland College
Through three observations of social cues of students in a community college lounge area, the author concludes that personal space is not mutually exclusive with rudeness. Rather, allowing others their personal space is a way of showing respect