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26 April 2024

» arxiv » 1208.2915

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Measurements of atmospheric neutrinos and antineutrinos in the MINOS Far Detector
MINOS Collaboration ; 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. Evans ; E. 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 ;
Date:	14 Aug 2012
Abstract:	This paper reports measurements of atmospheric neutrino and antineutrino interactions in the MINOS Far Detector, based on 2553 live-days (37.9 kton-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 $ u_{mu}$ and $ar{ u}_{mu}$ interactions, and 701 contained-vertex showers, composed mainly of charged-current $ u_{e}$ and $ar{ u}_{e}$ 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 $ u_{mu}$ and $ar{ u}_{mu}$ events. The observed ratio of $ar{ u}_{mu}$ to $ u_{mu}$ events is compared with the Monte Carlo simulation, giving a double ratio of $R^{data}_{ar{ u}/ u}/R^{MC}_{ar{ u}/ u} = 1.03 pm 0.08 (stat.) pm 0.08 (syst.)$. The $ u_{mu}$ and $ar{ u}_{mu}$ 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 $\|Delta m^{2}\| = (1.9 pm 0.4) imes 10^{-3} eV^{2}$ and $sin^{2} 2 heta > 0.86$. The fit is extended to incorporate separate $ u_{mu}$ and $ar{ u}_{mu}$ oscillation parameters, returning 90% confidence limits of $\|Delta m^{2}\|-\|Delta ar{m}^{2}\| = 0.6^{+2.4}_{-0.8} imes 10^{-3} eV^{2}$ on the difference between the squared-mass splittings for neutrinos and antineutrinos.
Source:	arXiv, 1208.2915
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