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Credits

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. Morf\'in, 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


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First direct observation of muon antineutrino disappearance.
6 april 2011

This letter reports the first direct observation of muon antineutrino
disappearance...

 

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 $6.3\sigma$. The best fit to oscillation yields
$\Delta
\bar{m}^{2}=(3.36^{+0.46}_{-0.40}\trm{(stat.)}\pm0.06\trm{(syst.)})\times
10^{-3}\,\eV^{2}$,
$\sin^{2}(2\bar{\theta})=0.86^{+0.11}_{-0.12}\trm{(stat.)}\pm0.01\trm{(syst.)}$.
The probability that the underlying muon neutrino and muon antineutrino
parameters are identical is 2.0%.
\\ ( http://arxiv.org/abs/1104.0344 ,  29kb)

 


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