Eur. Phys. J. C 22, 179-196 (2001)
The 2+2 and 3+1 four-family neutrino mixing at the neutrino factoryA. Donini1 and D. Meloni2
1 I.N.F.N., Sezione di Roma I and Dip. Fisica, Università di Roma "La Sapienza", P.le A. Moro 2, 00185 Rome, Italy
2 Dip. Fisica, Università di Roma "La Sapienza" and I.N.F.N., Sezione di Roma I, P.le A. Moro 2, 00185 Rome, Italy
(Received: 18 July 2001 / Published online: 21 September 2001 - © Springer-Verlag / Società Italiana di Fisica 2001 )
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, which point 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 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 channel. A smaller detector of 1 kton size can still observe very large effects in this channel.
© Società Italiana di Fisica, Springer-Verlag 2001