PoS - Proceedings of Science
Volume 402 - The 22nd International Workshop on Neutrinos from Accelerators (NuFact2021) - All Sessions
Latest oscillation results from T2K
J. Lagoda* and  On behalf of the T2K collaboration
Full text: pdf
Published on: March 31, 2022
T2K is an accelerator-based neutrino experiment providing world-leading measurements of the parameters governing neutrino oscillation. T2K data enabled the first 3$\sigma$ exclusion for some intervals of the CP-violating phase $\delta_{CP}$ and precision measurements of the atmospheric parameters $\Delta m^{2}_{32}$, $\sin^2\theta_{23}$.

The experiment uses a beam of muon (anti)neutrinos produced at the Japan Particle Accelerator Research Centre (JPARC) and a series of detectors located at JPARC and in Kamioka, 295 km away, to measure oscillation from neutrino event rates and spectra. The T2K beam will be upgraded with increased power in 2022 and, combined with an upgrade of the ND280 near detector, will usher in a new important physics period for T2K.

During the shutdown, T2K collaboration is working on an updated oscillation analysis to improve the control of systematic uncertainties. A new beam tuning has been developed, based on an improved NA61/SHINE measurement on a copy of the T2K target and including a refined modeling of the beam line materials. New selections have been developed at ND280, with proton and photon tagging, and at Super-Kamiokande, where pion tagging has been extended to muon neutrino samples. After reviewing the latest measurements of oscillation parameters, the status of such new analysis developments and the plan to deploy the beam and ND280 upgrade is presented.
DOI: https://doi.org/10.22323/1.402.0054
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