Measurement of neutrino oscillations with the MINOS detectors in the NuMI beam.xys

Auty, D J; Arms, K E; Andreopoulos, C; Adamson, P; Armstrong, R; Ayres, D S; Baller, B; Barnes, P D Jr; Barr, G; Peterson, E A; Petyt, D A; Pittam, R; Becker, B R; Plunkett, R K; Rahaman, A; Rameika, R A; Raufer, T M; Rebel, B; Reichenbacher, J; Cobb, J H; Rodrigues, P A; Rosenfeld, C; Rubin, H A; Ruddick, K; Belias, A; Ryabov, V A; Sanchez, M C; Saoulidou, N; Schneps, J; Schreiner, P; Coleman, S J; Seun, S-M; Shanahan, P; Smart, W; Smith, C; Sousa, A; Bernstein, R H; Speakman, B; Stamoulis, P

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This Letter reports new results from the MINOS experiment based on a two-year exposure to muon neutrinos from the Fermilab NuMI beam. Our data are consistent with quantum-mechanical oscillations of neutrino flavor with mass splitting |Deltam2| = (2.43+/-0.13) x 10(-3) eV2 (68% C.L.) and mixing angle sin2(2theta) > 0.90 (90% C.L.). Our data disfavor two alternative explanations for the disappearance of neutrinos in flight: namely, neutrino decays into lighter particles and quantum decoherence of neutrinos, at the 3.7 and 5.7 standard-deviation levels, respectively.

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