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First Direct Observation of Muon Antineutrino Disappearance

Adamson, P. and Himmel, A. and Howcroft, C. and Mualem, L. and Newman, H. B. and Ochoa-Ricoux, J. P. and Orchanian, M. and Patterson, R. B. (2011) First Direct Observation of Muon Antineutrino Disappearance. Physical Review Letters, 107 (1). Art. No. 021801. ISSN 0031-9007.

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This Letter reports the first direct observation of muon antineutrino disappearance. The MINOS experiment has taken data with an accelerator beam optimized for ν̅ _μ production, accumulating an exposure of 1.71×10^(20) protons on target. In the Far Detector, 97 charged current ν̅ _μ events are observed. The no-oscillation hypothesis predicts 156 events and is excluded at 6.3σ. The best fit to oscillation yields |Δm̅ 2|= [3.36=_(-0.40)^(+0.46)(stat)±0.06(syst)]x10^(-3)eV^2,sin^2(2θ̅)=0.86 _(-0.12)^(+0.11)(stat)±0.01(syst). The MINOS ν̅ _μ and ν̅ _μ measurements are consistent at the 2.0% confidence level, assuming identical underlying oscillation parameters.

Item Type:Article
Related URLs:
URLURL TypeDescription
Newman, H. B.0000-0003-0964-1480
Patterson, R. B.0000-0002-5787-9517
Additional Information:© 2011 American Physical Society. Received 2 April 2011; published 5 July 2011. This work was supported by the U.S. DOE; the United Kingdom STFC; the U.S. NSF; the State and University of Minnesota; the University of Athens, Greece; and Brazil’s FAPESP and CNPq. We are grateful to the Minnesota Department of Natural Resources, the crew of the Soudan Underground Laboratory, and the personnel of Fermilab for their contributions to this effort.
Funding AgencyGrant Number
Department of Energy (DOE)UNSPECIFIED
Science and Technology Facilities Council (STFC)UNSPECIFIED
University of MinnesotaUNSPECIFIED
University of AthensUNSPECIFIED
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)UNSPECIFIED
State of MinnesotaUNSPECIFIED
Fundação de Amparo à Pesquisa do Estado de Sao Paulo (FAPESP)UNSPECIFIED
Issue or Number:1
Classification Code:PACS: 14.60.Pq, 11.30.Er, 14.60.St
Record Number:CaltechAUTHORS:20110722-135827537
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:24510
Deposited By: Ruth Sustaita
Deposited On:22 Jul 2011 21:43
Last Modified:03 Oct 2019 02:57

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