${\theta }_{13}$, $\delta$ and the neutrino mass hierarchy at a $\gamma =350$ double baseline Li/B $\beta$-Beam

Abstract

We consider a $\beta$-Beam facility where ${}^8$Li and ${}^8$B ions are accelerated at $\gamma =350$, accumulated in a 10 Km storage ring and let decay, so as to produce intense ${\bar{\nu }}_e$ and ${\nu }_e$ beams. These beams illuminate two iron detectors located at $L\simeq 2000$ Km and $L\simeq 7000$ Km, respectively. The physics potential of this setup is analysed in full detail as a function of the flux. We find that, for the highest flux ($10\times 10^{18}$ ion decays per year per baseline), the sensitivity to ${\theta }_{13}$ reaches ${\sin }^{2}2{\theta }_{13}\ge 2\times 10^{-4}$; the sign of the atmospheric mass difference can be identified, regardless of the true hierarchy, for ${\sin }^{2}2{\theta }_{13}\ge 4\times 10^{-4}$; and, CP-violation can be discovered in 70% of the $\delta$-parameter space for ${\sin }^{2}2{\theta }_{13}\ge 10^{-3}$, having some sensitivity to CP-violation down to ${\sin }^{2}2{\theta }_{13}\ge 10^{-4}$ for $|\delta |\sim 90^{\circ }$.

35 pages, 20 figures. Minor changes, matches the published version

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