$\hat{I}{½}_{\hat{I}}¼$ disappearance at the SPL, T2K-I and the Neutrino Factory

Abstract

We study the $\hat{I}{½}_{\hat{I}}¼$ disappearance channel at T2K-phase I and the SPL and analyse the achievable reduction of present uncertainties in $\hat{I}{¸}_{23}$ and $\hat{I}”m_{23}^2$. We analyse the impact of discrete ambiguities in sign($\hat{I}”m^{2}23$) and sign($2\tan \hat{I}{¸}_{23}$). We show how the disappearance channel at the Neutrino Factory is complementary to the ``golden'' and ``silver'' appearance channels and can be used to reduce the eightfold-ambiguity problem in ($\hat{I}{¸}_{13}-\hat{I}´$).

2 pages, 3 epsfig; NUFACT'05, 21-26 June 2005, Frascati