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Title: First direct observation of muon antineutrino disappearance

Abstract

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

Authors:
 [1]
  1. et al.
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
Contributing Org.:
MINOS Collaboration
OSTI Identifier:
1011164
Alternate Identifier(s):
OSTI ID: 1099728
Report Number(s):
FERMILAB-PUB-11-163-PPD
Journal ID: ISSN 0031-9007 ; arXiv eprint number arXiv:1104.0344; TRN: US1102130
Grant/Contract Number:  
AC02-07CH11359
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 107; Journal Issue: 2; Journal ID: ISSN 0031-9007 
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ACCELERATORS; CHARGED CURRENTS; HYPOTHESIS; MUON ANTINEUTRINOS; OSCILLATIONS; PRODUCTION; PROTONS; Experiment-HEP

Citation Formats

Adamson, P. First direct observation of muon antineutrino disappearance. United States: N. p., 2011. Web. doi:10.1103/PhysRevLett.107.021801.
Adamson, P. First direct observation of muon antineutrino disappearance. United States. doi:10.1103/PhysRevLett.107.021801.
Adamson, P. Tue . "First direct observation of muon antineutrino disappearance". United States. doi:10.1103/PhysRevLett.107.021801. https://www.osti.gov/servlets/purl/1011164.
@article{osti_1011164,
title = {First direct observation of muon antineutrino disappearance},
author = {Adamson, P.},
abstractNote = {This letter reports the first direct observation of muon antineutrino disappearance. The MINOS experiment has taken data with an accelerator beam optimized for ν¯μ production, accumulating an exposure of 1.71 x 1020 protons on target. In the Far Detector, 97 charged current ν¯μ events are observed. The no-oscillation hypothesis predicts 156 events and is excluded at 6.3σ. The best fit to oscillation yields |Δm¯2| = (3.36-0.40 +0.46(stat.) ± 0.06(syst.)) x 10-3 eV2, sin2(2 θ¯) = 0.86-0.12+0.11 (stat.) ± 0.01(syst.). The MINOS νμ and ν¯μ measurements are consistent at the 2.0% confidence level, assuming identical underlying oscillation parameters.},
doi = {10.1103/PhysRevLett.107.021801},
journal = {Physical Review Letters},
number = 2,
volume = 107,
place = {United States},
year = {2011},
month = {7}
}

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