Speaker
Mr
Luke Southwell
(Lancaster University)
Description
The main irreducible background in the T2K electron-neutrino appearance
analysis is the nu_e contamination in the nu_{mu}
beam. In order to quantify this background, a selection of nu_e
charged-current (CC) interactions in the near detector
(ND280) Tracker region was developed by combining the particle
identification abilities of the time projection chambers and
electromagnetic calorimeters. We measured a data/Monte Carlo ratio of 1.01 +- 0.10 for the
electron-neutrino component of the beam providing an important confirmation of
our predictions of the expected backgrounds to the oscillation analyses. In 2014 the T2K experiment
will reverse the polarity of the magnetic horns and begin running with
an anti-neutrino beam for the first time. Differences in the oscillation
probabilities between neutrinos and anti-neutrinos may provide insight
into charge-parity violation in the leptonic sector. The current ND280
Tracker nu_e CC selection has been used as a
starting point for the anti-nu_e CC selection.
The additional challenges and selection criteria of the anti-nu_e
selection will be presented.
Primary author
Mr
Luke Southwell
(Lancaster University)