First direct observation of muon antineutrino disappearance
Creators: name: MINOS Collaboration
name: Adamson, P.
name: Andreopoulos, C.
name: Auty, D. J.
name: Ayres, D. S.
name: Backhouse, C.
name: Barr, G.
name: Bishai, M.
name: Blake, A.
name: Bock, G. J.
name: Boehnlein, D. J.
name: Bogert, D.
name: Cavanaugh, S.
name: Cherdack, D.
name: Childress, S.
name: Choudhary, B. C.
name: Coelho, J. A. B.
name: Coleman, S. J.
name: Corwin, L.
name: Cronin-Hennessy, D.
name: Danko, I. Z.
name: de Jong, J. K.
name: Devenish, N. E.
name: Diwan, M. V.
name: Dorman, M.
name: Escobar, C. O.
name: Evans, J. J.
name: Falk, E.
name: Feldman, G. J.
name: Frohne, M. V.
name: Gallagher, H. R.
name: Gomes, R. A.
name: Goodman, M. C.
name: Gouffon, P.
name: Graf, N.
name: Gran, R.
name: Grant, N.
name: Grzelak, K.
name: Habig, A.
name: Harris, D.
name: Hartnell, J.
name: Hatcher, R.
name: Himmel, A.
name: Holin, A.
name: Howcroft, C.
name: Huang, X.
name: Hylen, J.
name: Ilic, J.
name: Irwin, G. M.
name: Isvan, Z.
name: Jaffe, D. E.
name: James, C.
name: Jensen, D.
name: Kafka, T.
name: Kasahara, S. M. S.
name: Koizumi, G.
name: Kopp, S.
name: Kordosky, M.
name: Kreymer, A.
name: Lang, K.
name: Lefeuvre, G.
name: Ling, J.
name: Litchfield, P. J.
name: Loiacono, L.
name: Lucas, P.
name: Mann, W. A.
name: Marshak, M. L.
name: Mayer, N.
name: McGowan, A. M.
name: Mehdiyev, R.
name: Meier, J. R.
name: Messier, M. D.
name: Miller, W. H.
name: Mishra, S. R.
name: Mitchell, J.
name: Moore, C. D.
name: Morfín, J.
name: Mualem, L.
name: Mufson, S.
name: Musser, J.
name: Naples, D.
name: Nelson, J. K.
name: Newman, H. B.
name: Nichol, R. J.
name: Nicholls, T. C.
name: Nowak, J. A.
name: Ochoa-Ricoux, J. P.
name: Oliver, W. P.
name: Orchanian, M.
name: Ospanov, R.
name: Paley, J.
name: Patterson, R. B.
name: Pawloski, G.
name: Pearce, G. F.
name: Petyt, D. A.
name: Phan-Budd, S.
name: Plunkett, R. K.
name: Qiu, X.
name: Ratchford, J.
name: Raufer, T. M.
name: Rebel, B.
name: Rodrigues, P. A.
name: Rosenfeld, C.
name: Rubin, H. A.
name: Sanchez, M. C.
name: Schneps, J.
name: Schreiner, P.
name: Shanahan, P.
name: Sousa, A.
name: Stamoulis, P.
name: Strait, M.
name: Tagg, N.
name: Talaga, R. L.
name: Tetteh-Lartey, E.
name: Thomas, J.
name: Thomson, M. A.
name: Tinti, G.
name: Toner, R.
name: Tzanakos, G.
name: Urheim, J.
name: Vahle, P.
name: Viren, B.
name: Weber, A.
name: Webb, R. C.
name: White, C.
name: Whitehead, L.
name: Wojcicki, S. G.
name: Yang, T.
name: Zwaska, R.
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: 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 $1.71\times 10^{20}$ 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 $6.3σ$. The best fit to oscillation yields $Δ\bar{m}^{2}=(3.36^{+0.46}_{-0.40}\textrm{(stat.)}\pm0.06\textrm{(syst.)})\times 10^{-3}\,\eV^{2}$, $\sin^{2}(2\barθ)=0.86^{+0.11}_{-0.12}\textrm{(stat.)}\pm0.01\textrm{(syst.)}$. The MINOS muon neutrino and muon antineutrino measurements are consistent at the 2.0% confidence level, assuming identical underlying oscillation parameters.
description: Six pages, four figures. This version published by Physical Review Letters