Measurements of atmospheric neutrinos and antineutrinos in the MINOS Far Detector

Adamson, P. and Nowak, Jaroslaw (2012) Measurements of atmospheric neutrinos and antineutrinos in the MINOS Far Detector. Physical Review D – Particles and Fields, 86 (5). ISSN 1550-2368

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Abstract

This paper reports measurements of atmospheric neutrino and antineutrino interactions in the MINOS Far Detector, based on 2553 live-days (37.9 kton-years) of data. A total of 2072 candidate events are observed. These are separated into 905 contained-vertex muons and 466 neutrino-induced rock-muons, both produced by charged-current νμ and ν̅ μ interactions, and 701 contained-vertex showers, composed mainly of charged-current νe and ν̅ e interactions and neutral-current interactions. The curvature of muon tracks in the magnetic field of the MINOS Far Detector is used to select separate samples of νμ and ν̅ μ events. The observed ratio of ν̅ μ to νμ events is compared with the Monte Carlo (MC) simulation, giving a double ratio of Rν̅ /νdata/Rν̅ /νMC=1.03±0.08(stat)±0.08(syst). The νμ and ν̅ μ data are separated into bins of L/E resolution, based on the reconstructed energy and direction of each event, and a maximum likelihood fit to the observed L/E distributions is used to determine the atmospheric neutrino oscillation parameters. This fit returns 90% confidence limits of |Δm2|=(1.9±0.4)×10-3  eV2 and sin⁡22θ>0.86. The fit is extended to incorporate separate νμ and ν̅ μ oscillation parameters, returning 90% confidence limits of |Δm2|-|Δm̅ 2|=0.6-0.8+2.4×10-3  eV2 on the difference between the squared-mass splittings for neutrinos and antineutrinos.

Item Type:
Journal Article
Journal or Publication Title:
Physical Review D – Particles and Fields
Additional Information:
© 2012 American Physical Society
ID Code:
66765
Deposited By:
Deposited On:
26 Sep 2013 10:29
Refereed?:
Yes
Published?:
Published
Last Modified:
24 Sep 2020 01:36