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arXiv · 1708.05495

Decoherence, matter effect, neutrino hierarchy signature in long baseline experiments

João A. B. Coelho·W. Anthony Mann
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Abstract

Environmental decoherence of oscillating neutrinos of strength $\Gamma = (2.3 \pm 1.1) \times 10^{-23}$ GeV can explain how maximal $\theta_{23}$ mixing observed at 295 km by T2K appears to be non-maximal at longer baselines. As shown recently by R. Oliveira, the MSW matter effect for neutrinos is altered by decoherence: In normal (inverted) mass hierarchy, a resonant enhancement of $\nu_{\mu} (\bar{\nu}_{\mu}) \rightarrow \nu_{e} (\bar{\nu}_{e})$ occurs for $6 < E_{\nu} < 20$ GeV. Thus decoherence at the rated strength may be detectable as an excess of charged-current $\nu_{e}$ events in the full $\nu_{\mu}$ exposures of MINOS+ and OPERA.

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João A. B. Coelho, W. Anthony Mann. 2017-08-18. Decoherence, matter effect, neutrino hierarchy signature in long baseline experiments. https://doi.org/10.1103/physrevd.96.093009

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