Abstract
Recent measurement of a moderately large value of theta13 signifies an important breakthrough in establishing the standard three flavor oscillation picture of neutrinos. It has provided an opportunity to explore the sub-dominant three flavor effects in present and future long-baseline experiments. In this paper, we perform a comparative study of the physics reach of two future superbeam facilities, LBNE and LBNO in their first phases of run, to resolve the issues of neutrino mass hierarchy, octant of theta23, and leptonic CP violation. We also find that the sensitivity of these future facilities can be improved significantly by adding the projected data from T2K and NOvA. Stand-alone LBNO setup with a 10 kt detector has a mass hierarchy discovery reach of more than 7 sigma, for the lowest allowed value of sin^2theta23(true) = 0.34. This result is valid for any choice of true deltaCP and hierarchy. LBNE10, in combination with T2K and NOvA, can achieve 3 sigma hierarchy discrimination for any choice of deltaCP, sin^2theta23, and hierarchy. The same combination can provide a 3 sigma octant resolution for sin^2theta23(true) leq 0.44 or for sin^2theta23(true) geq 0.58 for all values of deltaCP(true). LBNO can give similar results with 10 kt detector mass. In their first phases, both LBNE10 and LBNO with 20 kt detector can establish leptonic CP violation for around 50% values of true deltaCP at 2 sigma confidence level. In case of LBNE10, CP coverage at 3 sigma can be enhanced from 3% to 43% by combining T2K and NOvA data, assuming sin^2theta23(true) = 0.5. For LBNO setup, CP violation discovery at 3 sigma is possible for 46% values of true deltaCP if we add the data from T2K and NOvA.
Highlights
Mass eigenvalues of mi ≤ 0.23 eV at 95% C.L. [10]
It is conjectured that the matter anti-matter asymmetry of the universe arose via leptogenesis [17], which requires the existence of CP violation in the leptonic sector
We explore the capabilities of future superbeam experiments with liquid argon detectors, Long-Baseline Neutrino Experiment (LBNE) [32,33,34,35,36] and Long-Baseline Neutrino Oscillation Experiment (LBNO) [37,38,39,40,41] towards resolving these unknowns
Summary
In Japan, the Tokai-to-Kamioka (T2K) experiment [23, 24] started taking data in 2010. The main goal of these experiments is to detect the electron neutrino appearance events in a νμ beam using the classic off-axis beam technique [50] that delivers a beam with a narrow peak in the energy spectrum. The position of this peak is tuned to be close to the expected oscillation maximum. It has been shown in reference [30] that equal runs in neutrino and anti-neutrino modes in T2K experiments are vital to settle the octant ambiguity of θ23 for all values of δCP. We use all these new features, the details of which are given in [29, 53]
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