394 research outputs found
Constraining the absolute neutrino mass scale and Majorana CP violating phases by future neutrinoless double beta decay experiments
Assuming that neutrinos are Majorana particles, in a three generation
framework, current and future neutrino oscillation experiments can determine
six out of the nine parameters which fully describe the structure of the
neutrino mass matrix. We try to clarify the interplay among the remaining
parameters, the absolute neutrino mass scale and two CP violating Majorana
phases, and how they can be accessed by future neutrinoless double beta
() decay experiments, for the normal as well as for the
inverted order of the neutrino mass spectrum. Assuming the oscillation
parameters to be in the range presently allowed by atmospheric, solar, reactor
and accelerator neutrino experiments, we quantitatively estimate the bounds on
, the lightest neutrino mass, that can be infered if the next generation
decay experiments can probe the effective Majorana mass
() down to
1 meV. In this context we conclude that in the case neutrinos are
Majorana particles: (a) if m_0 \gsim 300 meV, {\em i.e.}, within the range
directly attainable by future laboratory experiments as well as astrophysical
observations, then m_{ee} \gsim 30 meV must be observed;
(b) if meV, results from future decay
experiments combined with stringent bounds on the neutrino oscillation
parameters, specially the solar ones, will place much stronger limits on the
allowed values of than these direct experiments.Comment: 26 pages, 11 encapsulated postscript figures. A new figure and minor
changes are included. To be published in Phys. Rev.
Neutrino Discovery Limit of Dark Matter Direct Detection Experiments in the Presence of Non-Standard Interactions
The detection of coherent neutrino-nucleus scattering by the COHERENT
collaboration has set on quantitative grounds the existence of an irreducible
neutrino background in direct detection searches of Weakly Interacting Massive
Dark Matter candidates. This background leads to an ultimate discovery limit
for these experiments: a minimum Dark Matter interaction cross section below
which events produced by the coherent neutrino scattering will mimic the Dark
Matter signal, the so-called \emph{neutrino floor}. In this work we study the
modification of such neutrino floor induced by non-standard neutrino
interactions within their presently allowed values by the global analysis of
oscillation and COHERENT data. By using the full likelihood information of such
global analysis we consistently account for the correlated effects of
non-standard neutrino interactions both in the neutrino propagation in matter
and in its interaction in the detector. We quantify their impact on the
neutrino floor for five future experiments: DARWIN (Xe), ARGO (Ar), Super-CDMS
HV (Ge and Si) and CRESST phase III (CaWO). Quantitatively, we find that
non-standard neutrino interactions allowed at the level can result in
an increase of the neutrino floor of up to a factor with respect to
the Standard Model expectations and impact the expected sensitivities of the
ARGO, CRESST phase III and DARWIN experiments.Comment: 21 pages, 4 figures. Matches version published in the JHEP. Corrected
exposure and results for CRESST phase II
Comment on decay puzzle
We analize the current data on -lepton decays and show that they are
consistent with the Standard ModelComment: 5 pages, 1 figure (available from de authors), Latex, preprint
IFT-P.022/9
Benefits of Vine Leaf on Different Biological Systems
For centuries, the therapeutic benefits of grapes and other byproducts have been empirically used for medical purposes such as bleeding, pain, inflammation, nausea, diarrhea, gastroenteritis, or skin diseases. Moderated intake of the red wine improves parameters as blood lipids, endothelial dysfunction, platelet aggregation, and other risk factors for cardiovascular disease. However, few studies have been explored the potential benefits from vine byproducts. Vine leaves, a waste product from the vine, are also rich source of polyphenols and other therapeutic compounds. In this chapter, we explored the therapeutic properties from vine leaf in different biological systems
Constraints on singlet right-handed neutrinos coming from the -width
We study the constraints on masses and mixing angles imposed by the measured
invisible width, in a model in which a singlet right-handed neutrino
mixes with all the Standard Model neutrinos.Comment: Revtex, 7 pages, two figures available from the authors, preprint
IFT-P.040/92 IFUSP/P-1023/9
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