70 research outputs found
Parameter in the Vector Condensate Model of Electroweak Interactions
In the standard model of electroweak interactions the Higgs doublet is
replaced by a doublet of vector bosons and the gauge symmetry is broken
dynamically. This generates masses for the gauge bosons and fermions, as well
as it fixes the interactions in the model. The model has a low momentum scale.
In this note we show that the model survives the test of the
parameter, and to each momentum scale chooses a possible range of
vector boson masses.Comment: 3 pages, 2 figs, Te
Resonance Production of Three Neutral Supersymmetric Higgs Bosons at LHC
Multiple production of Higgs particles is essential to study Higgs
self-couplings at future high-energy colliders. In this paper we calculated the
resonance contributions to the production of three lightest neutral
supersymmetric Higgs bosons in gluon fusion at LHC. The cross sections due to
trilinear Higgs couplings is sizeable but the measurement of the quartic
coupling hhhH(h) seems to be impossible.Comment: 8 pages, 3 figure
Testing the Vector Condensate Model of Electroweak Interactions at High Energy Hadron Colliders
In the vector condensate model a doublet of vector fields plays the role of
the Higgs doublet of standard model and the gauge symmetry is broken
dynamically. This results in a theory surviving the test of radiative
corrections provided the new charged and neutral vector particles B have masses
of at least several hundred GeV's. In this note we show that while at the
Tevatron the heavy B-particle production is too low, at LHC the yield is large
and, for instance, the inclusive cross section of pairs is 51.5
(15.3) fb at TeV, GeV.Comment: 7 pages, plain latex, 2 latex figures include
Fermion Condensate Model of Electroweak Interactions
A new dynamical symmetry breaking model of electroweak interactions is
proposed based on interacting fermions. Two fermions of different SU_{L}(2)
representations form a symmetry breaking condensate and generate the lepton and
quark masses. The weak gauge bosons get their usual standard model masses from
a gauge invariant Lagrangian of a doublet scalar field composed of the new
fermion fields. The new fermion fields become massive by condensation. It is
shown that the new charged fermions are produced at the next linear colliders
in large number. The model is a low energy one which cannot be renormalized
perturbatively. For the parameters of the model unitarity constraints are
presented.Comment: 8 pages, 1 figur
S and T Parameters in the Fermion Condensate Model
We calculate the oblique electroweak corrections and confront them with the
experiments in a composite Higgs version of the standard model. A vector-like
weak doublet and a singlet fermion are added to the standard model without
elementary Higgs. Due to quartic coupling there is a mixing between the
components of the new fields triggering electroweak symmetry breaking. The
Peskin-Takeuchi S and T electroweak parameters are presented. The new sector of
vector-like fermions is slightly constrained, T gives an upper bound on the
mixing angle of the new fermions, which is already constrained by
self-consistent gap-equations. S gives no constraints on the masses. This
extension can give a positive contribution to T, allowing for a heavy Higgs
boson in electroweak precision tests of the Standard Model.Comment: 14 pages, 5 figure
A hybrid MBE-based growth method for large-area synthesis of stacked hexagonal boron nitride/graphene heterostructures
Van der Waals heterostructures combining hexagonal boron nitride (h-BN) and graphene offer many potential advantages, but remain difficult to produce as continuous films over large areas. In particular, the growth of h-BN on graphene has proven to be challenging due to the inertness of the graphene surface. Here we exploit a scalable molecular beam epitaxy based method to allow both the h-BN and graphene to form in a stacked heterostructure in the favorable growth environment provided by a Ni(111) substrate. This involves first saturating a Ni film on MgO(111) with C, growing h-BN on the exposed metal surface, and precipitating the C back to the h-BN/Ni interface to form graphene. The resulting laterally continuous heterostructure is composed of a top layer of few-layer thick h-BN on an intermediate few-layer thick graphene, lying on top of Ni/MgO(111). Examinations by synchrotron-based grazing incidence diffraction, X-ray photoemission spectroscopy, and UV-Raman spectroscopy reveal that while the h-BN is relaxed, the lattice constant of graphene is significantly reduced, likely due to nitrogen doping. These results illustrate a different pathway for the production of h-BN/graphene heterostructures, and open a new perspective for the large-area preparation of heterosystems combining graphene and other 2D or 3D materials
- …