Probing new physics scenarios in accelerator and reactor neutrino experiments

TL;DR

This paper combines data from Daya Bay and T2K experiments to constrain new physics models affecting neutrino oscillations, including large extra dimensions and non-standard interactions, providing bounds on their parameters.

Contribution

It presents the first combined analysis of reactor and accelerator neutrino data to constrain models with large extra dimensions and non-standard interactions affecting neutrino oscillations.

Findings

Limits on the size of extra dimensions: R 0f0f 0.17 0f 0f 0f m at 20f C.L.

NSI parameters constrained to .001 to .01 range.

Combined data improves bounds on new physics parameters.

Abstract

We perform a detailed combined fit to the $\overline \nu_e \rightarrow \overline \nu_e$ disappearence data of the Daya Bay experiment and the appearance $\nu_{\mu} \rightarrow \nu_{e}$ and disappearance $\nu_{\mu} \rightarrow \nu_{\mu}$ 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 $R\lesssim 0.17$ $\mu {\rm m}$ 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.