Abstract
Abstract We compare the physics potential of two representative options for a Super-Beam in Europe, studying the achievable precision at 1σ with which the CP violation phase (δ) could be measured, as well as the mass hierarchy and CP violation discovery potentials. The first setup corresponds to a high energy beam aiming from CERN to a 100 kt liquid argon detector placed at the Pyhäsalmi mine (2300 km), one of the LAGUNA candidate sites. The second setup corresponds to a much lower energy beam, aiming from CERN to a 500 kt water Čerenkov detector placed at the Gran Sasso underground laboratory (730 km). This second option is also studied for a baseline of 650 km, corresponding to the LAGUNA candidate sites of Umbria and the Canfranc underground laboratory. All results are presented also for scenarios with statistics lowered by factors of 2, 4, 8 and 16 to study the possible reductions of flux, detector mass or running time allowed by the large value of θ 13 recently measured.
Highlights
Background ktwater Cerenkov (WC); L = 730 km NνNνkt liquid argon (LAr); L = 2300 km and antineutrinos rather asymmetric at the LAr detector, negatively affecting its sensitivity to CP violation (CPV)
The left panel shows the results for a true normal hierarchy (NH), while the right panel shows the results for inverted hierarchy (IH)
The opposite is true for a water Cerenkov (WC) detector placed at a shorter baseline
Summary
Nνkt LAr; L = 2300 km and antineutrinos rather asymmetric at the LAr detector, negatively affecting its sensitivity to CPV. This unbalance is much less pronounced in the IH case. The left panel shows ∆δ, defined as 1/2 of the 1σ allowed region in the measurement of the CP violating phase δ. We plot this as a function of the true value of δ since this dependence is quite strong for this observable When reducing the statistics the deterioration of the Pyhasalmi setup in this measurement is faster than for the shorter baseline option, as shown by the more widely spaced lines
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