How two neutrino superbeam experiments do better than one

Abstract

We examine the use of two superbeam neutrino oscillation experiments with baselines $\lsim 1000$ km to resolve parameter degeneracies inherent in the three-neutrino analysis of such experiments. We find that with appropriate choices of neutrino energies and baselines two experiments with different baselines can provide a much better determination of the neutrino mass ordering than a single experiment alone. Two baselines are especially beneficial when the mass scale for solar neutrino oscillations $\delta m_{\mathrm{sol}}^2$ is $\gsim 5\times10^{-5}$ eV${}^2$. We also examine CP violation sensitivity and the resolution of other parameter degeneracies. We find that the combined data of superbeam experiments with baselines of 295 and 900 km can provide sensitivity to both the neutrino mass ordering and CP violation for ${\sin }^{2}2{\theta }_{13}$ down to 0.03 for $|\delta m_{\mathrm{atm}}^2|\simeq 3\times 10^{-3}$ eV${}^2$. It would be highly advantageous to have a 10% determination of $|\delta m_{\mathrm{atm}}^2|$ before the beam energies and baselines are finalized, although if $|\delta m_{\mathrm{atm}}^2|$ is not that well known, the neutrino energies and baselines can be chosen to give fairly good sensitivity for a range of $|\delta m_{\mathrm{atm}}^2|$.

18 pages, 6 PS figures, added references and revised discussion

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