(A) Neutrino fluxes and event ratios

Events (observed/expected) from accelerator ${{\boldsymbol \nu}_{{\mu}}}$ experiments. INSPIRE search

Some neutrino oscillation experiments compare the flux in two or more detectors. This is usually quoted as the ratio of the event rate in the far detector to the expected rate based on an extrapolation from the near detector in the absence of oscillations.

VALUE DOCUMENT ID TECN  COMMENT
• • • We do not use the following data for averages, fits, limits, etc. • • •
$1.01$ $\pm0.10$ 1
ABE
2014B
T2K ${{\mathit \nu}_{{e}}}$ rate in T2K near detect.
$0.71$ $\pm0.08$ 2
AHN
2006A
K2K K2K to Super-K
$0.64$ $\pm0.05$ 3
MICHAEL
2006
MINS All charged current events
$0.71$ ${}^{+0.08}_{-0.09}$ 4
ALIU
2005
K2K KEK to Super-K
$0.70$ ${}^{+0.10}_{-0.11}$ 5
AHN
2003
K2K KEK to Super-K
1  The rate of ${{\mathit \nu}_{{e}}}$ from ${{\mathit \mu}}$ decay was measured to be $0.68$ $\pm0.30$ compared to the predicted flux. From ${{\mathit K}}$ decay $1.10$ $\pm0.14$ compared to the predicted flux.
2  Based on the observation of 112 events when $158.1$ ${}^{+9.2}_{-8.6}$ were expected without oscillations. Including not only the number of events but also the shape of the energy distribution, the evidence for oscillation is at the level of about 4.3 $\sigma $. Supersedes ALIU 2005 .
3  This ratio is based on the observation of 215 events compared to an expectation of $336$ $\pm14$ without oscillations. See also ADAMSON 2008 .
4  This ratio is based on the observation of 107 events at the far detector 250 km away from KEK, and an expectation of $151$ ${}^{+12}_{-10}$.
5  This ratio is based on the observation of 56 events with an expectation of $80.1$ ${}^{+6.2}_{-5.4}$.
  References:
ABE 2014B
PR D89 092003 Measurement of the Intrinsic Electron Neutrino Component in the T2K Neutrino Beam with the ND280 Detector
AHN 2006A
PR D74 072003 Measurement of Neutrino Oscillation by the K2K Experiment
MICHAEL 2006
PRL 97 191801 Observation of Muon Neutrino Disappearance with the MINOS Detectors in the NuMI Neutrino Beam
ALIU 2005
PRL 94 081802 Evidence for Muon Neutrino Oscillation in an Accelerator-Based Experiment
AHN 2003
PRL 90 041801 Indications of Neutrino Oscillation in a 250 km Long Baseline Experiment