5,149 research outputs found
Inverse type II seesaw mechanism and its signature at the LHC and ILC
The advent of the LHC, and the proposal of building future colliders as the
ILC, both programmed to explore new physics at the TeV scale, justifies the
recent interest in studying all kind of seesaw mechanisms whose signature lies
on such energy scale. The natural candidate for this kind of seesaw mechanism
is the inverse one. The conventional inverse seesaw mechanism is implemented in
an arrangement involving six new heavy neutrinos in addition to the three
standard ones. In this paper we develop the inverse seesaw mechanism based on
Higgs triplet model and probe its signature at the LHC and ILC. We argue that
the conjoint analysis of the LHC together with the ILC may confirm the
mechanism and, perhaps, infer the hierarchy of the neutrino masses.Comment: 24 pages, 22 figure
Identificação do comportamento bovino a partir dos dados de aceleração do animal e monitoramento da luminosidade do ambiente.
Sazonalidade na produtividade e sobrevivência de minicepas de Eucalyptus benthamii x Eucalyptus dunnii.
Resumo
The speed of sound and isentropic compressibility of liquid difluoromethane (HFC32) fromT=(248 to 343) K and pressures up to 65 MPa
This work reports experimental data on the speed of sound in liquid difluoromethane
ŽHFC32, or R32. from T s Ž248 to 343. K and pressures up to 65 MPa. The results were
obtained using a newly-built apparatus, calibrated with toluene over the whole experimental
region, and show good agreement with two available data sets. The uncertainties are "0.01 K
in the temperature, "0.025 MPa in the pressure up to 35 MPa, and "0.2 MPa above this
value. The final uncertainty on the speed of sound is estimated to be "0.2 per cent. The data
were fitted using a simple analytical equation and the results are discussed. The isentropic
compressibility was calculated over the Ž p, T. surface where the reported speed of sound
values and the corresponding literature densities overlap.info:eu-repo/semantics/publishedVersio
The speed of sound, and derived thermodynamic properties of liquid trifluoromethane (HFC23) fromT=(258 to 303)K at pressures up to 65MPa
This work reports experimental data of the speed of sound in liquid trifluoromethane
(HFC23, or R23) from T = (258 to 303) K at pressures up to 65 MPa, measured with
a pulse-echo method adapted from Papadakis(1) and Guedes et al.(2) The results are fitted
to a rational approximant and compared with literature data.(3) Derived thermodynamic
properties such as the isentropic compressibility κs, the isothermal compressibility κT , the
cubic expansion coefficient αp, and the specific heat capacity at constant pressure cp are
calculated by combining the present experimental data with the density values published by
other authors.(4–11) The estimated properties are compared, where possible, with literature
data.info:eu-repo/semantics/publishedVersio
Sterile neutrino dark matter, CDMS-II and a light Higgs boson
We add a singlet right handed neutrino plus a charged and a neutral singlet
scalars to the standard model. This extension includes a discrete symmetry such
that we obtain a heavy sterile neutrino which couples only to the electron and
the new scalars. In this sense the singlet neutrino does not mix with ordinary
ones and thus has no effect on Big Bang Nucleosynthesis. However, such sterile
neutrino can be in equilibrium with electroweak particles in the early Universe
due to its couplings to electrons and also because the Higgs boson mixes with
the singlet scalars. We obtain that the sterile neutrino constitutes a dark
matter candidate and analyze its direct detection in the light of current
experiments. Our results show that if such a sterile neutrino is realized in
nature, and CDMS-II experiment confirms its positive signal, dark matter
demands a rather light Higgs boson with new Physics at some 500 GeV scale.Comment: 16 pages, 13 figures, uses axodraw.st
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