Results: Oscillations

Measurement of neutrino and antineutrino oscillations by the T2K experiment, including a new additional sample of electron neutrino interactions in the far detector

September 13, 2017

This data release pertains to this paper and includes results from both the frequentist and the Bayesian analyses presented there.

Both the tar files include a README document as well as several ROOT files with the results for different oscillation parameters.

For the frequentist analysis (T2K_VALOR_Data_release), each ROOT file contains the best fit point, the 68% and 90% CL contours, the χ2 = –2 Δln(ℒ) and Δχ2 map.

For the Bayesian analysis (jointfit2016_mach3.tar), each ROOT file contains the best fit point (in 2D and 4D modes), the 68% and 90% credible intervals, the 68% and 90% contours and the posterior probability density.

Measurement of Muon Antineutrino Oscillations with an Accelerator-Produced Off-Axis Beam

May 12, 2016

This data release pertains to this paper.

The tar file for this data release includes a README document in PDF format, and a ROOT file.
The ROOT file contains the best-fit points in the sin223)-Δm2 space, the 2D χ2 surface, 68% and 90% 2D confidence level contours, and 1D χ2 surfaces for both sin223) and Δm2.
All results are given for both normal and inverted hierarchy.
Measurement of Muon Antineutrino Oscillations with an Accelerator-Produced Off-Axis Beam

νμ disappearance measurement results 2014

March 26, 2014

This data release pertains to this paper.
The tar file for this data release includes a README document in PDF format, a ROOT file, and a plain text table of the analysis results. The ROOT file contains the best-fit points for sin223) vs. Δm2, the 2D log likelihood surface, 68% and 90% 2D Feldman-Cousins contours, and 1D profiled likelihood in. All results sin223) vs. Δm2 are given for both normal and inverted hierarchy. The text file contains the same information in plain text format.
T2K νμ disappearance results 2014

νμ disappearance measurement results 2013

September 4, 2013

The files in the following archive file contain the results of the νμ disappearance measurement reported in this paper.

This tar file contains a ROOT file with the best fit, 68% and 90% confidence regions of the νμ disappearance fit, and the Δχ2 surface. The tar file also contains TXT files with the Δχ2 surfaces. A README.pdf is also provided with detailed information about the contents of the included files:
T2K νμ disappearance results 2013

νe appearance measurement results 2012

April 10, 2013

The files in the following archive file contain the results of the νe appearance measurement reported in this paper.

This tar file contains ROOT files with the best fit, 68% and 90% confidence interval curves of the νe appearance fit and the negative log likelihood distribution. A README.pdf file is also provided with detailed information about the contents of the included files:
T2K νe appearance results 2012

νe appearance (July 2012)

December 17, 2012

sin2(2θ13) = 0.094+0.053-0.040 (0.116+0.063-0.049) for δCP = 0, Δm223 = 2.4×10-3 eV2, θ23 = π/4 and normal (inverted) hierarchy.

Data set: 3.01×1020 p.o.t.

ICHEP 2012 presentation

sin2(2θ13)-δCP contour data [ROOT file],   (Readme)

νμ disappearance (July 2011)

December 17, 2012

2.1×10-3 < Δm223(eV2) < 3.1×10-3 and sin223 > 0.85 at 90% C.L.

Data set: 1.43×1020 p.o.t.

PRD85,031103(2012)

arXiv:1201.1386

νe appearance (June 2011)

December 17, 2012

0.03(0.04) < sin213 < 0.28(0.34) for δCP=0 and a normal (inverted) hierarchy at 90% C.L.

Data set: 1.43×1020 p.o.t.

PRL107,041801(2011)

arXiv:1106.2822