Measurements of atmospheric neutrinos and antineutrinos in the MINOS far detector

P. Adamson, C. Backhouse, G. Barr, M. Bishai, A. S T Blake, G. J. Bock, D. J. Boehnlein, D. Bogert, S. V. Cao, J. D. Chapman, S. Childress, J. A B Coelho, L. Corwin, D. Cronin-Hennessy, I. Z. Danko, J. K. De Jong, N. E. Devenish, M. V. Diwan, C. O. Escobar, J. J. EvansE. Falk, G. J. Feldman, M. V. Frohne, H. R. Gallagher, R. A. Gomes, M. C. Goodman, P. Gouffon, N. Graf, R. Gran, K. Grzelak, A. Habig, J. Hartnell, R. Hatcher, A. Himmel, A. Holin, J. Hylen, G. M. Irwin, Z. Isvan, D. E. Jaffe, C. James, D. Jensen, T. Kafka, S. M S Kasahara, G. Koizumi, S. Kopp, M. Kordosky, A. Kreymer, K. Lang, J. Ling, P. J. Litchfield, L. Loiacono, P. Lucas, W. A. Mann, M. L. Marshak, M. Mathis, N. Mayer, M. M. Medeiros, R. Mehdiyev, J. R. Meier, M. D. Messier, W. H. Miller, S. R. Mishra, J. Mitchell, C. D. Moore, L. Mualem, S. Mufson, J. Musser, D. Naples, J. K. Nelson, H. B. Newman, R. J. Nichol, J. A. Nowak, W. P. Oliver, M. Orchanian, R. B. Pahlka, J. Paley, R. B. Patterson, G. Pawloski, S. Phan-Budd, R. K. Plunkett, X. Qiu, A. Radovic, J. Ratchford, B. Rebel, C. Rosenfeld, H. A. Rubin, M. C. Sanchez, J. Schneps, A. Schreckenberger, P. Schreiner, R. Sharma, A. Sousa, B. Speakman, M. Strait, N. Tagg, R. L. Talaga, J. Thomas, M. A. Thomson, R. Toner, D. Torretta, G. Tzanakos, J. Urheim, P. Vahle, B. Viren, J. J. Walding, A. Weber, R. C. Webb, C. White, L. Whitehead, S. G. Wojcicki, K. Zhang, R. Zwaska

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Abstract

This paper reports measurements of atmospheric neutrino and antineutrino interactions in the MINOS Far Detector, based on 2553 live-days (37.9kton-years) of data. A total of 2072 candidate events are observed. These are separated into 905 contained-vertex muons and 466 neutrino-induced rock-muons, both produced by charged-current ν μ and ν ̄μ interactions, and 701 contained-vertex showers, composed mainly of charged-current ν e and ν ̄e interactions and neutral-current interactions. The curvature of muon tracks in the magnetic field of the MINOS Far Detector is used to select separate samples of ν μ and ν ̄μ events. The observed ratio of ν ̄μ to ν μ events is compared with the MonteCarlo (MC) simulation, giving a double ratio of Rν̄/νdata/ Rν̄/νMC=1.03±0.08(stat)±0.08(syst). The ν μ and ν ̄μ data are separated into bins of L/E resolution, based on the reconstructed energy and direction of each event, and a maximum likelihood fit to the observed L/E distributions is used to determine the atmospheric neutrino oscillation parameters. This fit returns 90% confidence limits of |Δm2|=(1.9±0.4)×10 -3eV2 and sin22θ>0.86. The fit is extended to incorporate separate ν μ and ν ̄μ oscillation parameters, returning 90% confidence limits of |Δm2|-|Δm ̄2|=0.6- 0.8+2.4×10 -3eV2 on the difference between the squared-mass splittings for neutrinos and antineutrinos.

Original languageEnglish (US)
Article number052007
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume86
Issue number5
DOIs
StatePublished - Sep 17 2012

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