Enhancing the sensitivity to neutrino oscillation parameters using synergy between T2K, NO$ν$A and JUNO
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| Format: | Preprint |
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2025
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| _version_ | 1866911298813427712 |
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| author | Goswami, Srubabati Gupta, Aman Rahaman, Ushak Raut, Sushant K. |
| author_facet | Goswami, Srubabati Gupta, Aman Rahaman, Ushak Raut, Sushant K. |
| contents | We study the impact of combining the present NO$ν$A and T2K data with simulated data from the JUNO experiment on the determination of the leptonic CP phase and the neutrino mass hierarchy. The current NO$ν$A data exhibit a hierarchy--$δ_{\rm CP}$ degeneracy, admitting both normal hierarchy (NH) with $δ_{\rm CP} \in [0,180^\circ]$, and inverted hierarchy (IH) with $δ_{\rm CP} \in [180^\circ,360^\circ]$ solutions at comparable significance, while T2K prefers $δ_{\rm CP}\simeq 270^\circ$ for both hierarchies, leading to a $2σ$ tension between the two experiments for normal hierarchy. Using detailed GLoBES simulations, we show that future JUNO data with excellent hierarchy sensitivity, can lift the hierarchy--$δ_{\rm CP}$ degeneracy in NO$ν$A and strengthen the hierarchy reach of T2K in spite of having no $δ_{\rm CP}$ sensitivity. Allowing the hierarchy to be a free parameter in the fit, if the true ordering is IH, JUNO aligns the NO$ν$A and T2K allowed regions and resolves their present tension; if NH is true, the tension continues to persist. We also show that JUNO's precise measurement of $|Δ_{31}|$ leads to improved constraints on $\sin^2θ_{23}$ and $δ_{\rm CP}$ for normal mass hierarchy in NO$ν$A even though JUNO itself is insensitive to these parameters. Finally, updated solar parameter measurements from JUNO's first data release further enhance the combined precision. Our results demonstrate that JUNO plays a crucial synergistic role in the global neutrino oscillation programme, enabling a more robust determination of the mass ordering and improving the sensitivity to the CP phase when combined with long-baseline data. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2512_00172 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Enhancing the sensitivity to neutrino oscillation parameters using synergy between T2K, NO$ν$A and JUNO Goswami, Srubabati Gupta, Aman Rahaman, Ushak Raut, Sushant K. High Energy Physics - Phenomenology High Energy Physics - Experiment High Energy Physics - Theory We study the impact of combining the present NO$ν$A and T2K data with simulated data from the JUNO experiment on the determination of the leptonic CP phase and the neutrino mass hierarchy. The current NO$ν$A data exhibit a hierarchy--$δ_{\rm CP}$ degeneracy, admitting both normal hierarchy (NH) with $δ_{\rm CP} \in [0,180^\circ]$, and inverted hierarchy (IH) with $δ_{\rm CP} \in [180^\circ,360^\circ]$ solutions at comparable significance, while T2K prefers $δ_{\rm CP}\simeq 270^\circ$ for both hierarchies, leading to a $2σ$ tension between the two experiments for normal hierarchy. Using detailed GLoBES simulations, we show that future JUNO data with excellent hierarchy sensitivity, can lift the hierarchy--$δ_{\rm CP}$ degeneracy in NO$ν$A and strengthen the hierarchy reach of T2K in spite of having no $δ_{\rm CP}$ sensitivity. Allowing the hierarchy to be a free parameter in the fit, if the true ordering is IH, JUNO aligns the NO$ν$A and T2K allowed regions and resolves their present tension; if NH is true, the tension continues to persist. We also show that JUNO's precise measurement of $|Δ_{31}|$ leads to improved constraints on $\sin^2θ_{23}$ and $δ_{\rm CP}$ for normal mass hierarchy in NO$ν$A even though JUNO itself is insensitive to these parameters. Finally, updated solar parameter measurements from JUNO's first data release further enhance the combined precision. Our results demonstrate that JUNO plays a crucial synergistic role in the global neutrino oscillation programme, enabling a more robust determination of the mass ordering and improving the sensitivity to the CP phase when combined with long-baseline data. |
| title | Enhancing the sensitivity to neutrino oscillation parameters using synergy between T2K, NO$ν$A and JUNO |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment High Energy Physics - Theory |
| url | https://arxiv.org/abs/2512.00172 |