An incremental approach to unravel the neutrino mass hierarchy and CP violation with a long-baseline superbeam for large theta(13)
Agarwalla, Sanjib K.
- Journal Article
Rights / licenseCreative Commons Attribution 4.0 International
Recent data from long-baseline neutrino oscillation experiments have provided new information on θ 13, hinting that 0.01<∼sin2 2θ13<∼0.1 at 2 σ confidence level. In the near future, further confirmation of this result with high significance will have a crucial impact on the optimization of the future long-baseline neutrino oscillation experiments designed to probe the neutrino mass ordering and leptonic CP violation. In this context, we expound in detail the physics reach of an experimental setup where neutrinos produced in a conventional wide-band beam facility at CERN are observed in a proposed Giant Liquid Argon detector at the Pyhasalmi mine, at a distance of 2290 km. Due to the strong matter effects and the high detection efficiency at both the first and second oscillation maxima, this particular setup would have unprecedented sensitivity to the neutrino mass ordering and leptonic CP violation in the light of the emerging hints of large θ 13. With a 10 to 20 kt ‘pilot’ detector and just a few years of neutrino beam running, the neutrino mass hierarchy could be determined, irrespective of the true values of δ CP and the mass hierarchy, at 3 σ (5 σ) confidence level if sin2 2θ 13(true) = 0.05 (0.1). With the same exposure, we start to have 3 σ sensitivity to CP violation if sin2 2θ 13(true) > 0.05, in particular testing maximally CP-violating scenarios at a high confidence level. After optimizing the neutrino and anti-neutrino running fractions, we study the performance of the setup as a function of the exposure, identifying three milestones to have roughly 30%, 50% and 70% coverage in δ C P (true) for 3 σ CP violation discovery. For comparison, we also study the CERN to Slanic baseline of 1540 km. This work nicely demonstrates that an incremental program, staged in terms of the exposure, can achieve the desired physics goals within a realistically feasible timescale, and produce significant new results at each stage. Show more
Journal / seriesJournal of High Energy Physics
Pages / Article No.
SubjectNeutrino Physics; CP violation
Organisational unit03503 - Rubbia, André / Rubbia, André
MoreShow all metadata