Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-08-26
Phys.Lett.B696:227-231,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
14 pages, 1 figure, version published in PLB
Scientific paper
10.1016/j.physletb.2010.12.029
Lack of any information on the CP violating phase $\dcp$ weakens our ability to determine neutrino mass hierarchy. Magic baseline of 7500 km was proposed to overcome this problem. However, to obtain large enough fluxes, at this very long baseline, one needs new techniques of generating high intensity neutrino beams. In this letter, we highlight the {\it magical} properties of a 2540 km baseline. At such a baseline, using a narrow band neutrino superbeam whose flux peaks around the energy 3.5 GeV, we can determine neutrino mass hierarchy {\bf independent} of the CP phase. For $\sin^2 2 \theta_{13} \geq 0.05$, a very modest exposure of 10 Kiloton-years is sufficient to determine the hierarchy. For $0.02 \leq \sin^2 2 \theta_{13} \leq 0.05$, an exposure of about 100 Kiloton-years is needed.
Raut Sushant K.
Sankar Uma S.
Singh Ravi Shanker
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