Beaming neutrino and antineutrinos across the Earth to disentangle neutrino mixing parameters

Abstract

A MINOS result seemed to hint a different anti-neutrino mass splitting and mixing angle with respect to the neutrino ones, offering a hint for a CPT violation in lepton sector. However more recent MINOS data reduced the neutrino-antineutrino differences leading to a narrow discrepancy almost compatible with no CPT violation, hard to be disentangled. Moreover last a few years of OPERA activity on tau appearance is still un-probed (one unique event). Both flavor muon-tau mixing, tau appearance and eventual CPT violation disentanglement need more tools to be enhanced. Atmospheric muon neutrino spectra and anisotropy in Deep Core at ten-tens GeV (yet unpublished) may test the muon-tau conversion but they can hardly reveal such last tiny MINOS CPT asymmetry. We show how the longest baseline neutrino oscillation available, crossing most of the Earth diameter, within an OPERA-like experiment from CERN (or FERMILAB) to ICECUBE-Deep Core neutrino detector at 21 GeV energy, may at best disentangle even last tiny CPT violation (within 6 sigma a year) while testing at highest rate tau-antitau appearance. We propose the muon neutrino disappearance or (for any CPT violation) the partial anti-muon appearance at the longest distances. Such a tuned detection experiment may lead to a clear and strong signature of tau or anti-tau generation (even within its neutral current noise background events): nearly one antitau or two tau a day. The tau appearance signal is above (or within) 10 sigma a year, even for 1% OPERA-like experiment. Peculiar configurations for theta_13 angle test and hierarchy neutrino mass test may also be addressed by a Deep Core-PINGU array detector observing electron neutrino shower at 6 GeV neutrino energy windows.

18 pages, 23 figures; 8 Figures had minor changes: Double Fig4-5, Fig 6-7-8-9; 3 Figures are New: Final accepted version in Ap J (2012) with an addendum of a Cabibbo photo-art composition

References in corpus (6)

• Measurement of the atmospheric neutrino energy spectrum from 100 GeV to 400 TeV with IceCube
• An improved measurement of muon antineutrino disappearance in MINOS
• Physics with a very long neutrino factory baseline
• Inconsistence of super-luminal Cern-Opera neutrino speed with observed SN1987A burst and neutrino mixing for any imaginary neutrino mass
• A 20 GeVs transparent neutrino astronomy from the North Pole?
• Ghost condensation and CPT violation in neutrino sector

Cited by in corpus (6)

• Neutrino mass hierarchy determination with IceCube-PINGU
• Determination of the neutrino mass ordering by combining PINGU and Daya Bay II
• Flavor revolution at ICECUBE horizons?
• Crossing muons in Icecube at highest energy: Cornerstone to neutrino astronomy
• Solving the missing GRB neutrino and GRB-SN puzzles
• Mass hierarchy and CP-phase sensitivity of ORCA using Fermilab Neutrino Beam