Invisible Higgs Boson Decays in Spontaneously Broken R-Parity
of the recent data on neutrino oscillations that indicate non-zero neutrino masses. We show that, despite the smallness of neutrino masses, the Higgs boson can decay mainly to the invisible Goldstone boson associated to the spontaneous breaking of lepton number.
The search for invisibly decaying Higgs bosons should be taken into account in the planning of future accelerators,
such as the Large Hadron Collider and the Next Linear Collider.
Probing neutrino mass with multilepton production at the Tevatron in the simplest R-parity violation model
Modelo con tripletes de Higgs y violación bilineal de paridad-Rque relaciona las propiedades de neutrinos con los experimentos de aceleradores
Directores: Martin Hirsch y J.W.F. Valle
Neutrino oscillations driven by dark energy
relating neutrino masses to the dark energy density in the universe. We
point out that the neutrino mass variation can lead to level crossing and
thus a cosmo MSW effect, having dramatic consequences for the flavor ratio
of astrophysical neutrinos and the composition of the relic neutrino
background.
Determining the yet unknown neutrino parameters from future oscillation experimen
ts
of these quantities suffer from the problem of so called parameter degeneracy which could lead up to 8 solutions which give exactly the same probabilities for neutrino
and anti-neutrino for a given energy and baseline. I will give an overview of this problem and discuss some possible way way to lift the degeneracy. I will address that the reactor oscillation experiment which aim to measure $\theta_{13}$ can help in lifting this degeneracy.
Phenomenological Aspects of Supernova Neutrinos
These occur at the end of a massive ($M \gtrsim 8 M_\odot$) star's lifetime, and implies an energy release of the order of $O(10^{53})~erg$.
From a particle physics point of view neutrinos turn out to be essential in such events. First they are thought to play
a key role during the explosion phase and in the posterior cooling and
deleptonization of the star. On the other hand they are
responsible to carry away around $99\%$ of the total energy emitted.
Therefore these neutrinos could be easily detected in the case of a
nearby supernova in
the existent or planned neutrino detectors, what could provide a lot
of information about both neutrino properties and the supernova itself.
In this talk we will give an overview on the phenomenology involving
these neutrinos.
We will review the main features of the neutrino spectra and their
propagation through the SN envelope, as well as the current
uncertainties related.
Then we will describe the expected signal
in the case of a future galactic SN, and its implications in the
determination of neutrino properties, like the
mixing parameters and the mass hierarchy.
Update on neutrino oscillations
including new solar and atmospheric fluxes
CP sensitive observables in chargino productionwith transverse $e^{\pm}$ beam polarization
at a linear collider with transverse beam polarization.
We investigate the influence of the CP phases on azimuthal asymmetries in this process with subsequent chargino two-body decays.
We show that triple product correlations involving the transverse beam polarization vanish if at least one subsequent chargino
decay is not observed. We derive this result within the Minimal Supersymmetric
Standard Model (MSSM) with complex parameters, however, it holds also in the general
MSSM with SUSY flavour violation.
Recent developments in thermal leptogenesis
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See also the IFIC - CSIC/UVEG seminar list
See also the IFIC - CSIC/UVEG seminar list