Scientific Results

Published Results

The Public Materials Page provides downloadable PDF files of plots and diagrams from recent results, formatted as presentation slides. These files are released by MINOS for public use by non-MINOS scientists. All have been presented at recent conferences and represent published or soon-to-be published results.

Highlights from Recent Results

Plots and brief explanatory text for recent MINOS results. All plots shown here are available as downloadable PDFs on the Public Materials page. Click on the plot image for a full-page version.

COMBINED ANALYSIS OF νμ DISAPPEARANCE AND νe APPEARANCE USING BEAM AND ATMOSPHERIC DATA (August 2013)
MINOS has performed a combined analysis of νμ disappearance and νe appearance using its complete set of accelerator and atmospheric neutrino data. The analysis uses a full three-flavour framework, with the oscillation parameters Δm232, θ23, θ13 and δCP varied in the fit. The analysis also incorporates an external constraint of sin2θ13=0.0242±0.0025, based on an average of reactor neutrino measurements. The left panels of this figure show the 2D confidence levels on Δm232 and θ23 for the normal and inverted hierarchy. The contours are calculated relative to the overall best fit point of Δm232=-2.41x10-3 eV2 and sin2θ23=0.41, which is indicated by the star. The right panels show the corresponding 1D log-likelihood profiles as a function of Δm232 and θ23. The single-parameter confidence limits are: Δm232=[2.28-2.46]x10-3 eV2 (68% C.L.) and sin2θ23=[0.35-0.65] (90% C.L.) for the normal hierarchy; and Δm232=[2.32-2.53]x10-3 eV2 (68% C.L.) and sin2θ23=[0.34-0.67] (90% C.L.) for the inverted hierarchy. The 2D contours are available here as a ROOT file. More details on the analysis can be found in arXiv:hep-ex/1403.0867


νμ DISAPPEARANCE - OSCILLATION MEASUREMENT USING BEAM AND ATMOSPHERIC DATA (May 2013)
This figure shows the 90% confidence level contours for the neutrino oscillation parameters obtained by MINOS and other experiments. The MINOS analysis uses all νμ and νμ charged current interactions, assuming identical oscillation parameters for neutrinos and antineutrinos. The black line shows the 90% CL contour obtained from a combined analysis of the MINOS beam and atmospheric neutrino data. The red line shows the analysis of MINOS beam data only. These results are compared to the the measurements from Super-Kamiokande (blue) and T2K (green). The best fit point for the MINOS combined analysis is Δm2=(2.41+0.09-0.10 )x10-3 eV2, sin2(2Θ)=0.950+0.035-0.036, or sin2(2Θ) > 0.890 (90% CL). A tabular form of the likelihood surface from this analysis can be found here as a csv file, which lists sin2(2Θ), Δm2 and Δln(L) in three columns. The likelihood surface is also available here as a ROOT file. More details on this analysis can be found in arXiv:hep-ex/1304.6335 - published in Phys. Rev. Lett. 110, 2518011 (2013).


νμ DISAPPEARANCE - ANTINEUTRINO OSCILLATION MEASUREMENT USING BEAM AND ATMOSPHERIC DATA (May 2013)
This figure shows the 90% confidence level contours for the antineutrino oscillation parameters. The black line shows the 90% CL contour obtained from the combined analysis of all the MINOS beam and atmospheric neutrino data, allowing the neutrino and antineutrino oscillation parameters to float independently. Also shown are the MINOS antineutrino measurements using beam data only (red) and atmospheric data only (blue), as well as the Super-Kamiokande antineutrino measurement (dashed). The best fit antineutrino oscillation parameters obtained by the MINOS combined analysis are Δm2=(2.50+0.23-0.25 )x10-3 eV2, sin2(2Θ)=0.97+0.03-0.08, or sin2(2Θ) > 0.83 (90% CL). More details on this analysis can be found in arXiv:hep-ex/1304.6335 - published in Phys. Rev. Lett. 110, 2518011 (2013).


νμ DISAPPEARANCE - OBSERVED SPECTRA OF BEAM AND ATMOSPHERIC NEUTRINOS (May 2013)
This figure shows the observed distributions of muon neutrino and muon antineutrino charged-current interactions in the MINOS Far Detector. The top row of graphs shows the energy spectra for MINOS beam data, the bottom row shows the L/E distributions for MINOS atmospheric data. In each case, the black line shows the prediction without oscillations; the red line shows the best fit to oscillations; and the black points show the observed data. This plot is available here as a ROOT file


νe APPEARANCE ANALYSIS - LIMITS and BOUNDS
νe events appearing at the Far Detector can be used as a measure of the θ13 mixing angle. The plots show the allowed ranges and best fits for 2sin2(2θ13)sin223) as a function of the CP-violating phase δ. The upper (lower) panel assumes the normal (inverted) neutrino mass hierarchy. (The value of δ and the mass hierarchy are fixed in the fit). This fit combines data taken in the neutrino-enhanced and antineutrino-enhanced beam modes. The contour is available here as a ROOT file along with a description of the contents.



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