Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-03-09
Physics
High Energy Physics
High Energy Physics - Phenomenology
16 pages, 5 figures, based on a document submitted to the CERN SPC Panel on Future Neutrino Facilities (November 2009).
Scientific paper
The feasibility of a European next-generation very massive neutrino observatory in seven potential candidate sites located at distances from CERN ranging from 130 km to 2300 km, is being considered within the LAGUNA design study. The study is providing a coordinated technical design and assessment of the underground research infrastructure in the various sites, and its coherent cost estimation. It aims at a prioritization of the sites within summer 2010 and a start of operation around 2020. In addition to a rich non-accelerator based physics programme including the GUT-scale with proton decay searches, the detection of a next-generation neutrino superbeam tuned to measure the flavor-conversion oscillatory pattern (i.e. 1st and 2nd oscillation maxima) would allow to complete our understanding of the leptonic mixing matrix, in particular by determining the neutrino mass hierarchy and by studying CP-violation in the leptonic sector, thereby addressing the outstanding puzzle of the origin of the excess of matter over antimatter created in the very early stages of evolution of the Universe. We focus on a multi-MW-power neutrino superbeam (="hyperbeam") produced by high-intensity primary protons of energy 30$\div$50 GeV. We argue that this option is an effective way to establish long baseline neutrino physics in Europe with the high-stake prospects of measuring $\theta_{13}$ and addressing CP-violation in the leptonic sector.
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