The 2+2 and 3+1 Four-Family Neutrino Mixing at the Neutrino Factory

Abstract

We upgrade the study of the physical reach of a Neutrino Factory in the Four Family Neutrino Mixing scenario taking into account the latest LSND results that points out how the 3+1 scheme cannot be completely ruled out within the present experimental data (although the 2+2 scheme is still the preferred choice when four neutrinos are considered). A detailed comparison of the physical reach of the $\nu$-factory in the two schemes is given, with similar results for the sensitivity to the mixing angles. Huge CP-violating effects can be observed in both schemes with a near, O(10) Km, detector of O(10) Kton size in the ${\nu }_{\mu }\to {\nu }_{\tau }$ channel. A smaller detector of 1 Kton size can still observe very large effects in this channel.

arXiv comment38 Latex2e pages, 21 figures using epsfig, minor changes

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