4,289 research outputs found
Tensor interactions and decays
We study the effects of charged tensor weak currents on the
strangeness-changing decays of the lepton. First, we use the available
information on the form factors to obtain BR when the system is produced
in an antisymmetric tensor configuration. Then, we propose a mechanism for the
direct production of the in decays. Using the current
upper limit on this decay we set a bound on the symmetric tensor interactions.Comment: 13 pages, Late
Solvability of the Dirichlet, Neumann and the regularity problems for parabolic equations with H\"older continuous coefficients
We establish the -solvability of Dirichlet, Neumann and regularity
problems for divergence-form heat (or diffusion) equations with
H\"older-continuous diffusion coefficients, on bounded Lipschitz domains in
. This is achieved through the demonstration of invertibility of
the relevant layer-potentials which is in turn based on Fredholm theory and a
new systematic approach which yields suitable parabolic Rellich-type estimates
Transference of local to global maximal estimates for dispersive partial differential equations
In this paper we give an elementary proof for transference of local to global
maximal estimates for dispersive PDEs. This is done by transferring local
estimates for certain oscillatory integrals with rough phase functions, to the
corresponding global estimates. The elementary feature of our approach is that
it entirely avoids the use of the wave packet techniques which are quite common
in this context, and instead is based on scalings and classical oscillatory
integral estimates.Comment: 10 page
One-Loop Electroweak Corrections to the Muon Anomalous Magnetic Moment Using the Pinch Technique
The definition of the physical properties of particles in perturbative gauge
theories must satisfy gauge invariance as a requisite. The Pinch Technique
provides a framework to define the electromagnetic form factors and the
electromagnetic static properties of fundamental particles in a consistent and
gauge-invariant form. We apply a simple prescription derived in this formalism
to check the calculation of the gauge-invariant one-loop bosonic electroweak
corrections to the muon anomalous magnetic moment.Comment: 6 pages and 1 eps figur
Modeling non-thermal emission from stellar bow shocks
Runaway O- and early B-type stars passing throughout the interstellar medium
at supersonic velocities and characterized by strong stellar winds may produce
bow shocks that can serve as particle acceleration sites. Previous theoretical
models predict the production of high energy photons by non-thermal radiative
processes, but their efficiency is still debated. We aim to test and explain
the possibility of emission from the bow shocks formed by runaway stars
traveling through the interstellar medium by using previous theoretical models.
We apply our model to AE Aurigae, the first reported star with an X-ray
detected bow shock, to BD+43 3654, in which the observations failed in
detecting high energy emission, and to the transition phase of a supergiant
star in the late stages of its life.From our analysis, we confirm that the
X-ray emission from the bow shock produced by AE Aurigae can be explained by
inverse Compton processes involving the infrared photons of the heated dust. We
also predict low high energy flux emission from the bow shock produced by BD+43
3654, and the possibility of high energy emission from the bow shock formed by
a supergiant star during the transition phase from blue to red supergiant.Bow
shock formed by different type of runaway stars are revealed as a new possible
source of high energy photons in our neighbourhood
Determination of the Higgs boson mass by the cancellation of ultraviolet divergencies in the Theory
We assume the vanishing of the quadratic divergences in the electroweak theory. Using the top mass value reported
recently by the CDF Collaboration , we predict the
mass of the Higgs boson to be . If we assume the
vanishing of both quadratic and logarithmic divergencies of the top self-mass,
we predict and Comment: Latex file, 4 page
Tensor mesons produced in tau lepton decays
Light tensor mesons (T = a_2, f_2 and K_2^*) can be produced in decays of tau
leptons. In this paper we compute the branching ratios of tau --> T pi nu
decays by assuming the dominance of intermediate virtual states to model the
form factors involved in the relevant hadronic matrix element. The exclusive
f_2(1270) pi^- decay mode turns out to have the largest branching ratio, of
O(10^-4) . Our results indicate that the contributions of tensor meson
intermediate states to the three-pseudoscalar channels of tau decays are rather
small.Comment: 10 pages, 1 figure. Version accepted for publication in PRD, some
typos are corrected and comments are added in section 4. Conclusions remain
unchange
An approach to emotion recognition in single-channel EEG signals: a mother child interaction
In this work, we perform a first approach to emotion recognition from EEG single channel signals extracted in four (4) mother-child dyads experiment in developmental psychology -- Single channel EEG signals are analyzed and processed using several window sizes by performing a statistical analysis over features in the time and frequency domains -- Finally, a neural network obtained an average accuracy rate of 99% of classification in two emotional states such as happiness and sadness20th Argentinean Bioengineering Society Congress, SABI 2015 (XX Congreso Argentino de BioingenierÃa y IX Jornadas de IngenierÃa ClÃnica)28–30 October 2015, San Nicolás de los Arroyos, Argentin
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