Speaker
Prof.
Daniele Fargion
(ROMA1)
Description
A MINOS result (MINOS Collaboration 2010) 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 (MINOS Collaboration 2012) reduced the neutrino anti-neutrino 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 Atmospheric muon neutrino spectra and anisotropy in Deep Core at ten-tens GeV (yet unpublished) may test the muon-tau conversion but they can hardly reveal such last tiny MINOS CPT asymmetry.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-DeepCore 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 appearance. We propose a beam of muon neutrino and antineutrino through the Earth to test their disappearance or (for any CPT violation) the partial muon neutrino appearance at the longest distances Such a tuned detection experiment may lead also to a clear and strong signature of tau or anti-tau generation (even within its neutral current noise background events): nearly one anti tau or two tau a day, even within a mini OPERA-like test whose tunnel and whose flux is just one percent the corresponding OPERA experiment.
Primary author
Prof.
Daniele Fargion
(ROMA1)
