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Terrestrial matter effects on reactor antineutrino oscillations at JUNO or RENO-50: how small is small?
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We have carefully examined, in both analytical and numerical ways, how small the terrestrial matter effects can be in a given medium-baseline reactor antineutrino oscillation experiment like JUNO or RENO-50. Taking the ongoing JUNO experiment for example, we show that the inclusion of terrestrial matter effects may reduce the sensitivity of the neutrino mass ordering measurement by \Delta \chi^2_{\rm MO} \simeq 0.6, and a neglect of such effects may shift the best-fit values of the flavor mixing angle \theta_{12} and the neutrino mass-squared difference \Delta_{21} by about 1\sigma to 2\sigma in the future data analysis. In addition, a preliminary estimate indicates that a 2\sigma sensitivity of establishing the terrestrial matter effects can be achieved for about 10 years of data taking at JUNO with the help of a proper near detector implementation.
Forward citations
Cited by 2 Pith papers
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Towards a detection of reactor $\overline{\nu}^{}_e \to \overline{\nu}^{}_\mu$ and $\overline{\nu}^{}_e \to \overline{\nu}^{}_\tau$ oscillations with possible CP violation
A proof-of-concept study shows that elastic antineutrino-electron scattering at JUNO could in principle detect reactor appearance and probe CP violation, but the CP signal is tiny.
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Enhancing the sensitivity to neutrino oscillation parameters using synergy between T2K, NO$\nu$A and JUNO
Simulated JUNO data can break the NOvA hierarchy–CP degeneracy, and whether the T2K–NOvA tension persists depends on the true mass ordering: it disappears if the ordering is inverted and survives if normal.
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