Where we are on $\theta_{13}$: addendum to "Global neutrino data and recent reactor fluxes: status of three-flavour oscillation parameters"

TL;DR

This paper updates the status of the neutrino mixing angle θ13 by incorporating recent T2K and MINOS results, showing a combined significance of about 3σ for θ13 > 0, with implications for neutrino mass ordering.

Contribution

It provides a combined analysis of recent long-baseline neutrino experiment data to refine the measurement of θ13 and its significance in the context of global neutrino oscillation data.

Findings

Significance for θ13 > 0 is about 3σ.

Best fit sin^2θ13 values are 0.013 for normal ordering and 0.016 for inverted ordering.

Results depend on reactor neutrino data analysis assumptions.

Abstract

In this addendum to arXiv:1103.0734 we consider the recent results from long-baseline $\nu_\mu\to\nu_e$ searches at the T2K and MINOS experiments and investigate their implications for the mixing angle $\theta_{13}$ and the leptonic Dirac CP phase $\delta$. By combining the $2.5\sigma$ indication for a non-zero value of $\theta_{13}$ coming from T2K data with global neutrino oscillation data we obtain a significance for $\theta_{13} > 0$ of about $3\sigma$ with best fit points $\sin^2\theta_{13} = 0.013(0.016)$ for normal (inverted) neutrino mass ordering. These results depend somewhat on assumptions concerning the analysis of reactor neutrino data.