학술논문
First direct observation of muon antineutrino disappearance
Document Type
Working Paper
Author
MINOS collaboration; Adamson, P.; Andreopoulos, C.; Auty, D. J.; Ayres, D. S.; Backhouse, C.; Barr, G.; Bishai, M.; Blake, A.; Bock, G. J.; Boehnlein, D. J.; Bogert, D.; Cavanaugh, S.; Cherdack, D.; Childress, S.; Choudhary, B. C.; Coelho, J. A. B.; Coleman, S. J.; Corwin, L.; Cronin-Hennessy, D.; Danko, I. Z.; de Jong, J. K.; Devenish, N. E.; Diwan, M. V.; Dorman, M.; Escobar, C. O.; Evans, J. J.; Falk, E.; Feldman, G. J.; Frohne, M. V.; Gallagher, H. R.; Gomes, R. A.; Goodman, M. C.; Gouffon, P.; Graf, N.; Gran, R.; Grant, N.; Grzelak, K.; Habig, A.; Harris, D.; Hartnell, J.; Hatcher, R.; Himmel, A.; Holin, A.; Howcroft, C.; Huang, X.; Hylen, J.; Ilic, J.; Irwin, G. M.; Isvan, Z.; Jaffe, D. E.; James, C.; Jensen, D.; Kafka, T.; Kasahara, S. M. S.; Koizumi, G.; Kopp, S.; Kordosky, M.; Kreymer, A.; Lang, K.; Lefeuvre, G.; Ling, J.; Litchfield, P. J.; Loiacono, L.; Lucas, P.; Mann, W. A.; Marshak, M. L.; Mayer, N.; McGowan, A. M.; Mehdiyev, R.; Meier, J. R.; Messier, M. D.; Miller, W. H.; Mishra, S. R.; Mitchell, J.; Moore, C. D.; Morfín, J.; Mualem, L.; Mufson, S.; Musser, J.; Naples, D.; Nelson, J. K.; Newman, H. B.; Nichol, R. J.; Nicholls, T. C.; Nowak, J. A.; Ochoa-Ricoux, J. P.; Oliver, W. P.; Orchanian, M.; Ospanov, R.; Paley, J.; Patterson, R. B.; Pawloski, G.; Pearce, G. F.; Petyt, D. A.; Phan-Budd, S.; Plunkett, R. K.; Qiu, X.; Ratchford, J.; Raufer, T. M.; Rebel, B.; Rodrigues, P. A.; Rosenfeld, C.; Rubin, H. A.; Sanchez, M. C.; Schneps, J.; Schreiner, P.; Shanahan, P.; Sousa, A.; Stamoulis, P.; Strait, M.; Tagg, N.; Talaga, R. L.; Tetteh-Lartey, E.; Thomas, J.; Thomson, M. A.; Tinti, G.; Toner, R.; Tzanakos, G.; Urheim, J.; Vahle, P.; Viren, B.; Weber, A.; Webb, R. C.; White, C.; Whitehead, L.; Wojcicki, S. G.; Yang, T.; Zwaska, R.
Source
Phys.Rev.Lett.107:021801,2011
Subject
Language
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 $1.71\times 10^{20}$ 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 $\Delta \bar{m}^{2}=(3.36^{+0.46}_{-0.40}\textrm{(stat.)}\pm0.06\textrm{(syst.)})\times 10^{-3}\,\eV^{2}$, $\sin^{2}(2\bar{\theta})=0.86^{+0.11}_{-0.12}\textrm{(stat.)}\pm0.01\textrm{(syst.)}$. The MINOS muon neutrino and muon antineutrino measurements are consistent at the 2.0% confidence level, assuming identical underlying oscillation parameters.
Comment: Six pages, four figures. This version published by Physical Review Letters
Comment: Six pages, four figures. This version published by Physical Review Letters