1,022 research outputs found
NLO correction to Higgs boson parameters in the 1/N expansion
We present the result of a calculation of the next-to-leading correction to
the Higgs propagator in the 1/N expansion, where the Higgs sector is treated as
an O(N) symmetric sigma-model. The results are compared with two-loop
perturbation theory. The existing discrepancy between the lowest order of the
1/N expansion and perturbation theory is dramatically reduced by including the
NLO in 1/N. We find a maximum effective Higgs mass of 930-980 GeV. We give an
approximate relation between Higgs width and mass, which can be used for
phenomenological purposes.Comment: 5 pages LaTex, 1 eps figure included. To appear in Phys.Lett.
Bounds on the nonminimal coupling of the Higgs Boson to gravity
We derive the first bound on the value of the Higgs boson nonminimal coupling to the Ricci scalar. We show that the recent discovery of the Higgs boson at the Large Hadron Collider at CERN implies that the nonminimal coupling is smaller than 2.6×10^15
Density-metric unimodular gravity:vacuum spherical symmetry
We analyze an alternative theory of gravity characterized by metrics that are
tensor density of rank(0,2)and weight-1/2.The metric compatibility condition is
supposed to hold. The simplest expression for the action of gravitational field
is used.Taking the metric and trace of connections as dynamical variables,the
field equations in the absence of matter and other kinds of sources are
derived.The solutions of these equations are obtained for the case of vacuum
static spherical symmetric spacetime.The null geodesics and advance of
perihelion of ellipes are discussed.We confirm a subclass of solutions is
regular for r>0 and there is no event horizon while it is singular at r=0.Comment: 15 pages,no,figures,typos corrected,new section added,published
versio
Principal response curves technique for the analysis of multivariate biomonitoring time series
Although chemical and biological monitoring is often used to evaluate the quality of surface waters for regulatory purposes and/or to evaluate environmental status and trends, the resulting biological and chemical data sets are large and difficult to evaluate. Multivariate techniques have long been used to analyse complex data sets. This paper discusses the methods currently in use and introduces the principal response curves method, which overcomes the problem of cluttered graphical results representation that is a great drawback of most conventional methods. To illustrate this, two example data sets are analysed using two ordination techniques, principal component analysis and principal response curves. Whereas PCA results in a difficult-to-interpret diagram, principal response curves related methods are able to show changes in community composition in a diagram that is easy to read. The principal response curves method is used to show trends over time with an internal reference (overall mean or reference year) or external reference (e.g. preferred water quality or reference site). Advantages and disadvantages of both methods are discussed and illustrate
A flat space-time model of the Universe
We propose a model of the Universe based on Minkowski flat space-time metric.
In this model the space-time does not evolve. Instead the matter evolves such
that all the mass parameters increase with time. We construct a model based on
unimodular gravity to show how this can be accomplished within the framework of
flat space-time. We show that the model predicts the Hubble law if the masses
increase with time. Furthermore we show that it fits the high z supernova data
in a manner almost identical to the standard Big Bang model. Furthermore we
show that at early times the Universe is dominated by radiative energy density.
The phenomenon of recombination also arises in our model and hence predicts the
existence of CMBR. However a major difference with the standard Big Bang is
that the radiative temperature and energy density does not evolve in our model.
Furthermore we argue that the basic motivation for inflation is absent in our
model.Comment: 11 pages, no figures, changes in presentatio
Resonance in Strong WW Rescattering in Massive SU(2) Gauge Theory
We investigate the effects of WW rescattering through strong anomalous
four-vector boson couplings. In the I=1, J=1 channel, we find a resonance with
a mass of approximately 200 GeV and a width of less than 12 GeV. In an
application to pion physics we find a small correction to the KSRF relation.Comment: 21 pages, extended discussion, some minor change
Phantom field fluctuation induced Higgs effect
Symmetry breaking solutions are investigated in the limit for
the ground state of a system consisting of a Lorentz-scalar, N component
``phantom'' field and an O(N) singlet. The most general form of O(N) x Z_2
invariant quartic interaction is considered. The non-perturbatively
renormalised solution demonstrates the possibility for Z_2 symmetry breaking
induced by phantom fluctuations. It becomes also evident that the strength of
the ``internal'' dynamics of the N-component field tunes away the ratio of the
Higgs condensate and the Higgs mass from its perturbative (nearly tree-level)
expression.Comment: 9 pages, uses elsart.cls, version to appear in Phys. Lett.
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