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24 April 2024

» arxiv » 1104.0344

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First direct observation of muon antineutrino disappearance
MINOS collaboration ; P. Adamson ; C. Andreopoulos ; D. J. Auty ; D. S. Ayres ; C. Backhouse ; G. Barr ; M. Bishai ; A. Blake ; G. J. Bock ; D. J. Boehnlein ; D. Bogert ; S. Cavanaugh ; D. Cherdack ; S. Childress ; B. C. Choudhary ; J. A. B. Coelho ; S. J. Coleman ; L. Corwin ; D. Cronin-Hennessy ; I. Z. Danko ; J. K. de Jong ; N. E. Devenish ; M. V. Diwan ; M. Dorman ; 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 ; N. Grant ; K. Grzelak ; A. Habig ; D. Harris ; J. Hartnell ; R. Hatcher ; A. Himmel ; A. Holin ; X. Huang ; J. Hylen ; J. Ilic ; 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 ; G. Lefeuvre ; J. Ling ; P. J. Litchfield ; L. Loiacono ; P. Lucas ; W. A. Mann ; M. L. Marshak ; N. Mayer ; A. M. McGowan ; R. Mehdiyev ; J. R. Meier ; M. D. Messier ; W. H. Miller ; S. R. Mishra ; J. Mitchell ; C. D. Moore ; J. Morfín ; L. Mualem ; S. Mufson ; J. Musser ; D. Naples ; J. K. Nelson ; H. B. Newman ; R. J. Nichol ; T. C. Nicholls ; J. A. Nowak ; J. P. Ochoa-Ricoux ; W. P. Oliver ; M. Orchanian ; R. Ospanov ; J. Paley ; R. B. Patterson ; G. Pawloski ; G. F. Pearce ; D. A. Petyt ; S. Phan-Budd ; R. K. Plunkett ; X. Qiu ; J. Ratchford ; T. M. Raufer ; B. Rebel ; P. A. Rodrigues ; C. Rosenfeld ; H. A. Rubin ; M. C. Sanchez ; J. Schneps ; P. Schreiner ; P. Shanahan ; A. Sousa ; P. Stamoulis ; M. Strait ; N. Tagg ; R. L. Talaga ; E. Tetteh-Lartey ; J. Thomas ; M. A. Thomson ; G. Tinti ; R. Toner ; G. Tzanakos ; J. Urheim ; P. Vahle ; B. Viren ; A. Weber ; R. C. Webb ; C. White ; L. Whitehead ; S. G. Wojcicki ; T. Yang ; R. Zwaska ;
Date:	3 Apr 2011
Abstract:	This letter reports the first direct observation of muon antineutrino disappearance. The MINOS experiment has taken data with an accelerator beam optimized for muon antineutrino production, accumulating an exposure of $1.71 imes 10^{20}$ protons on target. In the Far Detector, 97 charged current muon antineutrino events are observed. The no-oscillation hypothesis predicts 156 events and is excluded at $6.3sigma$. The best fit to oscillation yields $Delta ar{m}^{2}=(3.36^{+0.46}_{-0.40} rm{(stat.)}pm0.06 rm{(syst.)}) imes 10^{-3},eV^{2}$, $sin^{2}(2ar{ heta})=0.86^{+0.11}_{-0.12} rm{(stat.)}pm0.01 rm{(syst.)}$. The probability that the underlying muon neutrino and muon antineutrino parameters are identical is 2.0%.
Source:	arXiv, 1104.0344
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