142 research outputs found
Neutrinos: Fast & Curious
The Standard Model has been effective way beyond expectations in foreseeing
the result of almost all the experimental tests done up so far. In it,
neutrinos are massless. Nonetheless, in recent years we have collected solid
proofs indicating little but non zero masses for the neutrinos (when contrasted
with those of the charged leptons). These masses permit neutrinos to change
their flavor and oscillate, indeed a unique treat. In these lectures, I discuss
the properties and the amazing potential of neutrinos in and beyond the
Standard Model.Comment: 22 pages, contribution to the 2016 European School of High-Energy
Physics, Skeikampen, Norway , 15 - 28 June 2016, to appear as a CERN Yellow
Report. arXiv admin note: substantial text overlap with arXiv:1504.0703
Oscillations, Neutrino Masses and Scales of New Physics
We show that all the available experimental information involving neutrinos
can be accounted for within the framework of already existing models where
neutrinos have zero mass at tree level, but obtain a small Dirac mass by
radiative corrections.Comment: 10 pages, 3 postscript figures (eps
CP Violation with Three Oscillating Neutrino Flavours
We explore the prospects of observing leptonic CP violation in a neutrino
factory in the context of a scenario with three strongly oscillating neutrinos
able to account for the solar, the atmospheric and the LSND results. We address
also the problems related with the fake asymmetries induced by the experimental
device and by the presence of matter.Comment: 12 pages, 4 postscript figures (eps), to appear in Phys. Lett.
Homeotic Supersymmetry
It is commonly believed that unbroken supersymmetry (SUSY) implies that all
members of a supermultiplet have the same mass. We demonstrate that this is not
true, by exhibiting a simple counterexample. We employ the formalism of
homeotic fermions, in a simple model where CPT conjugate fermions have
different masses. This model can be supersymmetrized to a hypermultiplet of
fields which form a representation of the conventional N=2 SUSY algebra.
Nevertheless, CPT conjugate states in this hypermultiplet have different
masses. These surprising results do not violate either the CPT theorem nor the
Haag-Lopuszanski-Sohnius theorem.Comment: 4 pages, revte
Gravitational waves from first order phase transitions as a probe of an early matter domination era and its inverse problem
We investigate the gravitational wave background from a first order phase
transition in a matter-dominated universe, and show that it has a unique
feature from which important information about the properties of the phase
transition and thermal history of the universe can be easily extracted. Also,
we discuss the inverse problem of such a gravitational wave background in view
of the degeneracy among macroscopic parameters governing the signal.Comment: 12 pages, 6 figures, 1 tabl
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