354 research outputs found
On the Mass Eigenstate Purity of B^8 Solar Neutrinos
We give a brief report on our recent paper, hep-ph/0601198, in which we
calculate the nu_2 mass eigenstate purity of B^8 solar neutrinos as 91 +/- 2 %.Comment: 3 pages, 2 postscript figures, latex, AIP conference style. PANIC
2005 proceeding
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 Mass Matrix Textures: A Data-driven Approach
We analyze the neutrino mass matrix entries and their correlations in a
probabilistic fashion, constructing probability distribution functions using
the latest results from neutrino oscillation fits. Two cases are considered:
the standard three neutrino scenario as well as the inclusion of a new sterile
neutrino that potentially explains the reactor and gallium anomalies. We
discuss the current limits and future perspectives on the mass matrix elements
that can be useful for model building.Comment: 25 pages, 18 figure
Can New Colored Particles Illuminate the Higgs?
We analyze the behavior of Higgs to diphoton rate and Higgs gluon-gluon
production cross section in minimal extensions of the Standard Model comprising
new colored vector-like fermions that do not mix with the ordinary ones. We
compare these information with constraints coming from electroweak precision
measurements. We compute pair production cross sections for the lightest
fermion and discuss the LHC bounds. Finally, we study the phenomenology of
possible quarkonium states composed by these new colored fermions.Comment: 18 pages, 7 figures. v2: typos fixed, references added, small
improvements mad
Can the new resonance at LHC be a CP-Odd Higgs boson?
A plausible explanation of the recent experimental indication of a resonance
in the two-photon spectrum at LHC is that it corresponds to the CP-odd Higgs
boson. We explore such a possibility in a generic framework of the two Higgs
doublet models (2HDM), and combine GeV with the known ~GeV to show that the charged Higgs boson and the other CP-even
scalar masses become bounded from bellow and from above. We show that this
possibility is also consistent with the electroweak precision data and the low
energy observables, which we test in a few leptonic and semileptonic decay
modes.Comment: 16 pages, published versio
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