Abstract
The ultimate goal of future neutrino facilities is the determination of CP violation in neutrino oscillations. Besides |U(e3)|≠0, this will require precision experiments with a very intense neutrino source and energy control. With this objective in mind, the creation of monochromatic neutrino beams from the electron capture decay of boosted ions by the SPS of CERN has been proposed. We discuss the capabilities of such a facility as a function of the energy of the boost and the baseline for the detector. We compare the physics potential for two different configurations: (I) γ=90 and γ=195 (maximum achievable at present SPS) to Frejus; (II) γ=195 and γ=440 (maximum achievable at upgraded SPS) to Canfranc. We conclude that the SPS upgrade to 1000 GeV is important to reach a better sensitivity to CP violation iff it is accompanied by a longer baseline.
Highlights
The simulations of the physics output for an EC neutrino beam at different energies indicate: 1) The principle of energy dependence to separate out the CP-even and CP-odd contributions to the neutrino oscillation probability works
2) The upgrade to higher energy in the SPS boost (Ep = 1000 GeV) helps to have a better sensitivity to CP violation, which is the main objective of the generation neutrino oscillation experiments, iff accompanied by a longer baseline
Like the phase-shifts in interference phenomena, the presence of δ is easier to observe when the energy of the neutrino beams enters into the region of the second oscillation
Summary
In an electron capture facility the neutrino energy is dictated by the chosen boost of the ion source and the neutrino beam luminosity is concentrated at a single known energy which may be chosen at will for the values in which the sensitivity for the (θ13, δ) parameters is higher. The above discussion proves that the study of neutrino oscillations in terms of neutrino energy will be able to separate out the CP phase δ from the mixing parameters.
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