NOνAplus T2K: The race for the neutrino mass hierarchy

Abstract

The determination of the ordering of the neutrino masses (the hierarchy) is probably a crucial prerequisite to understand the origin of lepton masses and mixings and to establish their relationship to the analogous properties in the quark sector. Here, we follow an alternative strategy to the usual neutrino-antineutrino comparison in long baseline neutrino oscillation experiments: we exploit the combination of the neutrino-only data from the NOνA and the T2K experiments by performing these two off-axis experiments at different distances but at the same E /L, where E is the mean neutrino energy and L is the baseline. This would require a minor adjustment to the proposed off-axis angle for one or both of the proposed experiments.

Atmospheric neutrinos in ice and measurement of neutrino oscillation parameters

“…Note that our choice of 2 dof statistics is rather conservative as explained in the Appendix of Ref. [22]. The three plots correspond to three different reference values of θ 23 : 45 • , 43 • and 41 • , all within the 1 sigma presently allowed region.…”

Beta Beams

“…Consensus exists that even a global fit of T2K plus NOνA plus reactors will not be able to provide firm results (3σ or better) for leptonic CP violation (30) or sign( m 2 31 ) (30,31), no matter what the value of θ 13 is. A further generation of long-baseline neutrino experiments will be needed to address this important search.…”

CombiningCPT-conjugate neutrino channels at Fermilab

“…Notice that the ellipses overlap for a significant fraction of values of the CP-phase δ for every allowed value of sin 2 2θ 13 . This makes the determination of sign(∆m Following the line of thought developed by Minakata, Nunokawa and Parke [19], we exploited in a previous work [29,30] the neutrino data only from two experiments at different distances and at different off-axis locations, such that the E /L is the same for the two experiments (see also Refs. [31,32,33,34,35]).…”