CP violation and mass hierarchy at medium baselines in the large theta(13) era

Abstract

The large value of theta(13) recently measured by rector and accelerator experiments opens unprecedented opportunities for precision oscillation physics. In this paper, we reconsider the physics reach of medium baseline superbeams. For theta(13) ~ 9 degree we show that facilities at medium baselines -- i.e. L ~ O(1000 km) -- remain optimal for the study of CP violation in the leptonic sector, although their ultimate precision strongly depends on experimental systematics. This is demonstrated in particular for facilities of practical interest in Europe: a CERN to Gran Sasso and CERN to Phyasalmi nu_mu beam based on the present SPS and on new high power 50 GeV proton driver. Due to the large value of theta(13), spectral information can be employed at medium baselines to resolve the sign ambiguity and determine the neutrino mass hierarchy. However, longer baselines, where matter effects dominate the nu_mu->nu_e transition, can achieve much stronger sensitivity to sign(Delta m^2) even at moderate exposures.

14 pages, 14 figures, version to appear in EPJC

References in corpus (13)

• Observation of electron-antineutrino disappearance at Daya Bay
• Indication of Electron Neutrino Appearance from an Accelerator-produced Off-axis Muon Neutrino Beam
• Global analysis of neutrino masses, mixings and phases: entering the era of leptonic CP violation searches
• New features in the simulation of neutrino oscillation experiments with GLoBES 3.0
• NOvA Proposal to Build a 30 Kiloton Off-Axis Detector to Study Neutrino Oscillations in the Fermilab NuMI Beamline
• Underground Neutrino Detectors for Particle and Astroparticle Science: the Giant Liquid Argon Charge Imaging ExpeRiment (GLACIER)
• Systematic uncertainties in long-baseline neutrino oscillations for large ${\theta }_{13}$
• On the impact of systematical uncertainties for the CP violation measurement in superbeam experiments
• A new, very massive modular Liquid Argon Imaging Chamber to detect low energy off-axis neutrinos from the CNGS beam. (Project MODULAr)
• Which long-baseline neutrino experiments are preferable?
• Precision physics with a wide band super neutrino beam
• A comparative study of long-baseline superbeams within LAGUNA for large ${\theta }_{13}$
• Optimization of neutrino beams for underground sites in Europe

Cited by in corpus (5)

• Neutrino Mass and Mixing with Discrete Symmetry
• Quantifying the sensitivity of oscillation experiments to the neutrino mass ordering
• A novel technique for the measurement of the electron neutrino cross section
• On the Bayesian approach to neutrino mass ordering
• A Novel Approach to Study Atmospheric Neutrino Oscillation