Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-11-30
Phys.Lett. B621 (2005) 276-287
Physics
High Energy Physics
High Energy Physics - Phenomenology
16 pages, 14 eps figures
Scientific paper
10.1016/j.physletb.2005.06.072
In this letter we present the study of the eightfold degeneracy in the $(\theta_{13},\delta)$ measurement including both appearance and disappearance channels. We analyse, for definiteness, the case of a standard low-$\gamma$ $\beta$-Beam and a 4 MWatt SPL Super-Beam facility, both aiming at a UNO-like Mton water Cerenkov detector located at the Frejus laboratory, $L = 130$ km. In the $\beta$-Beam case, the \nue disappearance channel does not improve the $(\theta_{13},\delta)$ measurement when a realistic (i.e. $\ge$ 2%) systematic error is included. In the Super-Beam case, the \numu disappearance channel could, instead, be quite useful in reducing the impact of the eightfold degeneracy in the $(\theta_{13},\delta)$ measurement, especially once the error on the atmospheric mass difference is fully taken into account in the fit.
Donini Andrea
Fernandez-Martinez Enrique
Rigolin Stefano
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