Probing new physics scenarios in accelerator and reactor neutrino experiments

Abstract

We perform a detailed combined fit to the ${\overline{\nu }}_e\to {\overline{\nu }}_e$ disappearence data of the Daya Bay experiment and the appearance ${\nu }_{\mu }\to {\nu }_e$ and disappearance ${\nu }_{\mu }\to {\nu }_{\mu }$ data of the Tokai to Kamioka (T2K) one in the presence of two models of new physics affecting neutrino oscillations, namely a model where sterile neutrinos can propagate in a large compactified extra dimension and a model where non-standard interactions (NSI) affect the neutrino production and detection. We find that the Daya Bay $\oplus$ T2K data combination constrains the largest radius of the compactified extra dimensions to be $R\lesssim 0.17$ $\mu \mathrm{m}$ at 2$\sigma$ C.L. (for the inverted ordering of the neutrino mass spectrum) and the relevant NSI parameters in the range $\mathcal{O}(10^{-3})-\mathcal{O}(10^{-2})$, for particular choices of the charged parity violating phases.

arXiv comment18 pages, 10 figures, 4 tables; typos corrected; matches published version

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