Adamson, P;
Andreopoulos, C;
Auty, DJ;
Ayres, DS;
Backhouse, C;
Barr, G;
Bishai, M;
... MINOS Collaboration; + view all
(2011)
First Direct Observation of Muon Antineutrino Disappearance.
PHYS REV LETT
, 107
(2)
, Article 021801. 10.1103/PhysRevLett.107.021801.
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Abstract
This Letter reports the first direct observation of muon antineutrino disappearance. The MINOS experiment has taken data with an accelerator beam optimized for (nu) over bar (mu) production, accumulating an exposure of 1.71 x 10(20) protons on target. In the Far Detector, 97 charged current (nu) over bar (mu) events are observed. The no-oscillation hypothesis predicts 156 events and is excluded at 6.3 sigma. The best fit to oscillation yields vertical bar Delta(m) over bar (2)vertical bar = [3.36(-0.40)(+0.46)(stat) +/- 0.06(sys)] x 10(-3) eV(2), sin(2)(2 (theta) over bar) = 0.86(-0.12)(+0.11)(stat) +/- 0.01(syst). The MINOS nu(mu) and (nu) over bar (mu) measurements are consistent at the 2.0% confidence level, assuming identical underlying oscillation parameters.
Type: | Article |
---|---|
Title: | First Direct Observation of Muon Antineutrino Disappearance |
Open access status: | An open access version is available from UCL Discovery |
DOI: | 10.1103/PhysRevLett.107.021801 |
Publisher version: | http://dx.doi.org/10.1103/PhysRevLett.107.021801 |
Language: | English |
Additional information: | © 2011 American Physical Society |
Keywords: | NEUTRINO OSCILLATIONS, LEPTON CHARGE, MATTER |
UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
URI: | https://discovery.ucl.ac.uk/id/eprint/1303292 |
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