138 research outputs found

    Neutrinos: Fast & Curious

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    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

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    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

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    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

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    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

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    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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