Adamson, P, Andreopoulos, C, Auty, D., Ayres, D.S, Backhouse, C, Barr, G, Bishai, M, Blake, A, Block, G.J, Boehnlein, D.J, Devenish, N.E, Falk, E, Hartnell, J, Lefeuvre G, G and et al, (2011) First direct observation of muon antineutrino disappearance. Physical Review Letters, 107 (2). 021801. ISSN 0031-9007

Preview

PDF - Published Version Download (273kB) | Preview

Abstract

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 1.71×1020 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)]×10-3  eV2, sin⁡2(2θ̅ )=0.86-0.12+0.11(stat)±0.01(syst). The MINOS νμ and ν̅ μ measurements are consistent at the 2.0% confidence level, assuming identical underlying oscillation parameters.

Item Type:	Article
Schools and Departments:	School of Mathematical and Physical Sciences > Physics and Astronomy
Depositing User:	David Auty
Date Deposited:	06 Feb 2012 19:27
Last Modified:	09 Mar 2017 06:23
URI:	http://srodev.sussex.ac.uk/id/eprint/20664

View download statistics for this item

📧 Request an update