Dr. Roger Wendell (ICRR)
Antineutrino Results from T2K
The Tokai-to-Kamioka (T2K) long-baseline neutrino experiment made the first discovery of electron neutrino appearance in a beam of primarily muon neutrinos in 2013. Based on this discovery it is now possible to probe neutrino CP violation by comparing the oscillations of neutrinos and antineutrinos using this appearance channel.

In order to realize such a measurement T2K has been accumulating data from an antineutrino-enhanced beam since 2014. Since the electron antineutrino appearance probability depends heavily on on the muon antineutrino disappearance probability, measurements of the latter represent not only the first step towards a CP violation measurement but also provide a means of testing CPT symmetry when compared to similar measurements done with the neutrino enhanced beam.

This presentation will discuss the first physics results from T2K's antineutrino beam running, focusing on measurements of muon antineutrino disappearance.