# Neutrino 2018 - XXVIII International Conference on Neutrino Physics and Astrophysics

4-9 June 2018
Heidelberg
Europe/Berlin timezone
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# Contribution Poster accelerator

Poster (participating in poster prize competition)

# Updated Results for the Search for $\bar{\nu}_{\mu} \rightarrow \bar{\nu}_{e}$ Oscillations from T2K in the 3-flavour Framework

## Speakers

• Mr. Francis BENCH

## Authorship annotation

For the T2K collaboration, on behalf of the VALOR group

## Session and Location

Wednesday Session, Poster Wall #68 (Auditorium Gallery Right)

## Abstract content

I report the results of a search for $\bar{\nu}{\mu} \rightarrow \bar{\nu}{e}$ oscillations at the T2K experiment in a 3-flavour framework using an exposure of $1.49 \times 10^{21}$ Protons On Target (POT) in $\nu$ mode and $1.12 \times 10^{21}$ POT in $\bar{\nu}$ mode, an increase of $50\%$ in the $\bar{\nu}$ exposure compared to results reported in 2016.

Results are reported for a joint analysis where candidate events are selected from the e-like events observed in $\bar{\nu}$ running mode, while four other far detector event samples are used with near-detector data to constrain the values of the oscillation and systematic parameters, including the mass-hierarchy, giving the best possible constraint on $\bar{\nu}{e}$ appearance. Two hypotheses are tested, a) no $\bar{\nu}{e}$ appearance and b) $\bar{\nu}_{e}$ appearance according to the current best knowledge of the PMNS matrix, where both rate-only and rate+shape analyses are performed, producing p-values for each hypothesis.

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