774 research outputs found

    Solar neutrino physics on the beginning of 2017

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    This writeup is a review of current hot topics on solar neutrinos. It is based on a talk at the conference "Neutrinos: the quest for a new physics scale", held at the CERN on March 2017, where the Organizers entrusted me with a discussion of the provocative question "whether solar neutrino physics is over". Rather than providing a straight (negative) answer, in view of an audience consisting mostly of colleagues working in theoretical particle physics, I deemed it more useful providing a description of what is the current activity of the physicists working in solar neutrinos, leaving the listener free of forming his/her own opinion apropos.Comment: LaTeX, 10 pages, 6 figures, 2 tables. Minor improvements, matches version published in "Nuclear Physics and Atomic Energy

    Joint analysis of Borexino and SNO solar neutrino data and reconstruction of the survival probability

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    Solar neutrino oscillations are supported by KamLAND's antineutrino measurements, but certain solar neutrino data - the observed shape of the 8{}^8B flux and the difference between day and night counting rates measured in Super-Kamiokande - do not fit well with the ensuing oscillation pattern. Interestingly, other solar neutrino data allow independent tests of the survival probability. Thanks to the new measurements of Borexino at low-energies along with the standard solar model and to the results of SNO at high-energies, four values of the neutrino survival probability are known. We build and study a likelihood based only on these solar neutrino data. The results agree well with the standard oscillation pattern and in particular with KamLAND findings. A related and straightforward procedure permits to reconstruct the survival probability of solar neutrinos and to assess its uncertainties, for all solar neutrino energies.Comment: LaTeX, 12 pages, 4 figures, 1 table. Minor improvements. Version accepted in "Nuclear Physics and Atomic Energy

    La Thuile 2014: Theoretical premises to neutrino round table

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    This talk, dedicated to the memory of G. Giacomelli, introduced the round table on neutrinos held in February 2014. The topics selected for the discussion are: 1) the neutrinoless double beta decay rate (interpretation in terms of light neutrinos, nuclear uncertainties); 2) the physics in the gigantic water Cherenkov detectors (proton decay, atmospheric neutrinos); 3) the study of neutrino oscillations (mass hierarchy and CP violation; other neutrino states); 4) the neutrino astronomy at low and high energies (solar, supernova, cosmic neutrinos). The importance of an active interplay between theory and experiment is highlighted.Comment: 14 pages, 7 figures. Minor revision of the tex

    Is a Coherent Picture of Massive Neutrinos Emerging?

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    The hypothesis that neutrinos are massive has a strong experimental support; however, the information we have is quite limited, and many possibilities are open. Theoretical considerations might help fill the gaps (or foresee regularities), as we illustrate with a specific example.Comment: 2 pages, ws-p9-75x6-50.cls file included. To appear in the "Proceedings of the 9th Marcel Grossmann Meeting", Rome, Jul 2000, Session AP5 (Experimental Status of Neutrino Mixing
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