2025/06/06 by The T2K Collaboration, Abe, K., Abe, S. +401 · 3 citations
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex)
paper · doi:10.48550/arxiv.2506.05889
T2K has made improved measurements of three-flavor neutrino mixing with 19.7(16.3)× 1020 protons on target in (anti-)neutrino-enhanced beam modes. A new sample of muon-neutrino events with tagged pions has been added at the far detector, increasing the neutrino-enhanced muon-neutrino sample size by 42.5%. In addition, new samples have been added at the near detector, and significant improvements have been made to the flux and neutrino interaction modeling. T2K data continues to prefer the normal mass ordering and upper octant of sin2θ23 with a near-maximal value of the charge-parity violating phase with best-fit values in the normal ordering of δ\scriptscriptstyleCP=-2.18\substack+1.22 -0.47, sin2θ23=0.559\substack+0.018 -0.078 and Δm232=(+2.506\substack+0.039 -0.052)× 10-3 eV2.