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Published September 2013 | public
Book Section - Chapter

New Results on Electron Neutrino Appearance in MINOS

Abstract

Neutrino oscillation is now an established phenomenon, thanks to a variety of experiments [1, 2, 3, 4, 5, 6, 7] which have probed various apparent anomalies in expected neutrino spectra from the sun, atmosphere, nuclear reactors, and accelerator-based beams. The three weak eigenstates - v_e, v_μ, v_r - are related to the three mass eigenstates - v_1, v-2, v_3 - via the PMNS (for Pontecorvo, Maki, Nakagawa, and Sakata) matrix, a unitary mixing matrix U parametrized by three mixing angles - θ_(12), θ_(13), θ_(23) - and three CP-violating phases - δ, ɑ_1, ɑ_2 [8]. No hints exist yet as to the value of δ, and oscillation experiments are not sensitive to the latter two CP-violating phases, which are nonzero only if neutrinos are their own antiparticles (i.e., Majorana particles). So far, two of the mixing angles, θ_(12) and θ_(23), have been measured [1, 4, 6] and are large. The value of θ_(13), on the other hand, appears to be quite small. It was first significantly constrained by the CHOOZ experiment in 1999 [9]; the result is shown in Fig.1. These proceedings report the latest improvements on this constraint by the MINOS experiment and survey the future of research in this area.

Additional Information

© 2014 World Scientific Publishing Co. September 30, 2011. We thank the organizers of the 49th International School of Subnuclear Physics for the opportunity to present this work during the New Talents sessions of the School. These proceedings report work supported by the U.S. DOE; the U.K. STFC; the U.S. NSF; the State and University of Minnesota; the University of Athens, Greece; and Brazil's FAPESP, CNPq, and CAPES. We are grateful to the Minnesota Department of Natural Resources, the crew of the Soudan Underground Laboratory, and the staff of Fermilab for their contributions to this effort.

Additional details

Created:
September 27, 2023
Modified:
January 13, 2024