Synergies and prospects for early resolution of the neutrino mass ordering

Cabrera, Anatael, Han, Yang, Obolensky, Michel, Cavalier, Fabien, Coelho, João, Navas-Nicolás, Diana, Nunokawa, Hiroshi, Simard, Laurent, Bian, Jianming, Nayak, Nitish, Asquith, Lily, Bezerra, Thiago J C, Hartnell, Jeff, Lasorak, Pierre and others, (2022) Synergies and prospects for early resolution of the neutrino mass ordering. Scientific Reports, 12. p. 5393. ISSN 2045-2322

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The measurement of neutrino mass ordering (MO) is a fundamental element for the understanding of leptonic flavour sector of the Standard Model of Particle Physics. Its determination relies on the precise measurement of Δm312 and Δm322 using either neutrino vacuum oscillations, such as the ones studied by medium baseline reactor experiments, or matter effect modified oscillations such as those manifesting in long-baseline neutrino beams (LBνB) or atmospheric neutrino experiments. Despite existing MO indication today, a fully resolved MO measurement (≥ 5 σ) is most likely to await for the next generation of neutrino experiments: JUNO, whose stand-alone sensitivity is ∼ 3 σ, or LBνB experiments (DUNE and Hyper-Kamiokande). Upcoming atmospheric neutrino experiments are also expected to provide precious information. In this work, we study the possible context for the earliest full MO resolution. A firm resolution is possible even before 2028, exploiting mainly vacuum oscillation, upon the combination of JUNO and the current generation of LBνB experiments (NOvA and T2K). This opportunity is possible thanks to a powerful synergy boosting the overall sensitivity where the sub-percent precision of Δm322 by LBνB experiments is found to be the leading order term for the MO earliest discovery. We also found that the comparison between matter and vacuum driven oscillation results enables unique discovery potential for physics beyond the Standard Model.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
SWORD Depositor: Mx Elements Account
Depositing User: Mx Elements Account
Date Deposited: 14 Jul 2022 13:39
Last Modified: 14 Jul 2022 13:45

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