Hierarchy independent sensitivity to leptonic δ_CP with atmospheric neutrinos

Abstract

The Dirac leptonic CP phase δ_CP is one of the crucial unknown parameters in neutrino oscillation physics. In this paper we explore the possibility of using low energy atmospheric neutrino events to probe δ_CP . We show that at sub GeV energies, when the events are binned as a function of the energy and direction of the final state leptons, a consistent distinction between various true δ_CP values is obtained. We also show that at these energies there is no sensitivity to the mass ordering/hierarchy, so that δ_CP can be measured without hierarchy ambiguity. In addition a preliminary \c{hi}^2 analysis of the sensitivity to δ_CP using atmospheric neutrinos assuming a generic detector with perfect separation between charged current ν_μ , \bar{ν}_μ , ν_e and \bar{ν}_e events is given.

18 pages, 9 figures, revised to include contrast between low and high energy atmospheric neutrino information and expanded

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Cited by in corpus (2)

• Probing the sensitivity to leptonic ${\delta }_{CP}$ in presence of invisible decay of ${\nu }_3$ using atmospheric neutrinos
• Analytical description of CP violation in oscillations of atmospheric neutrinos traversing the Earth