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Neutrino mass ordering: Circumventing the challenges using synergy between T2HK and JUNO

Choubey, Sandhya; Ghosh, Manojit; Raikwal, Deepak (2022) Neutrino mass ordering: Circumventing the challenges using synergy between T2HK and JUNO. Physical Review D, 106 (11). ISSN 2470-0010

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One of the major open problems of neutrino physics is MO (mass ordering). We discuss the prospects of measuring MO with two under-construction experiments T2HK and JUNO. JUNO alone is expected to measure MO with greater than $3\sigma$ significance as long as certain experimental challenges are met. In particular, JUNO needs better than 3\% energy resolution for MO measurement. On the other hand, T2HK has rather poor prospects at measuring the MO, especially for certain ranges of the CP violating parameter $\delta_{;\rm CP};$, posing a major drawback for T2HK. In this article we show that the synergy between JUNO and T2HK will bring two-fold advantage. Firstly, the synergy between the two experiments helps us determine the MO at a very high significance. With the baseline set-up of the two experiments, we have a greater than $9\sigma$ determination of the MO for all values of $\delta_{;\rm CP};$. Secondly, the synergy also allows us to relax the constraints on the two experiments. We show that JUNO, could perform extremely well even for energy resolution of 5\%, while for T2HK the MO problem with ``bad" values of $\delta_{;\rm CP};$ goes away. The MO sensitivity for the combined analysis is expected to be greater than $6\sigma$ for all values of $\delta_{;\rm CP};$ and with just 5\% energy resolution for JUNO.

Item Type: Article
Uncontrolled Keywords: Neutrino Oscillation
Subjects: NATURAL SCIENCES > Physics
Divisions: Center of Excellence for Advanced Materials and Sensing Devices
Depositing User: Sofija Konjević
Date Deposited: 03 Apr 2023 11:10
DOI: 10.1103/physrevd.106.115013

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