Neutrino oscillations along the Earth to probe flavor parameters: a NeuWorld

TL;DR

This paper proposes a long-baseline neutrino experiment crossing Earth to improve measurements of neutrino oscillation parameters, test CPT violation, and detect tau neutrinos with high precision using existing detectors.

Contribution

It introduces a novel experimental setup (NeuWorld) utilizing Earth's diameter as a baseline to enhance neutrino oscillation studies and CPT violation tests.

Findings

Potential to detect nearly one anti-tau or two tau neutrinos per day.

Significant improvement in measuring neutrino oscillation parameters.

Ability to test CPT violation with high sensitivity.

Abstract

On 2010 MINOS experiment was showing an hint of possible different mass splitting and mixing angles for neutrinos and anti-neutrinos, suggesting a charge-parity-time (CPT) violation in the lepton sector; last year 2012 a second result from MINOS showed a reduced discrepancy between the two set of parameters, nearly compatible with no CPT violation. We proposed an experiment for more precise estimation of neutrino oscillation parameters being useful not only for a complete discrimination for CPT scenarios, but also for mass hierarchy and theta 13 determination, and mostly for the first oscillated detection of tau and antitau neutrinos. We show an experiment, (the longest baseline neutrino oscillation test available by crossing most of Earth diameter, a NeuWorld), that may improve the oscillation measurement and disentangle at best any hypothetical CPT violation while testing tau appearance at the same time of the muon disappearance correlated. The experiment use a neutrino beam crossing the Earth, within an OPERA-like experiment from CERN (or Fermilab), in the direction of the IceCube DeepCore detector at the South Pole. Such a tuned beaming and its detection may lead to a strong signature of neutrino muon-tau mixing (nearly one anti tau or two tau a day, with 10 sigma in a year), even for an one per-cent OPERA-like NeuWorld experiment.