#### R(${{\mathit \mu}}$ /${{\mathit e}}$ ) = (Measured Ratio ${{\mathit \mu}}$ /${{\mathit e}}$ ) $/$ (Expected Ratio ${{\mathit \mu}}$ /${{\mathit e}}$ )

VALUE DOCUMENT ID TECN  COMMENT
• • We do not use the following data for averages, fits, limits, etc. • •
$0.658$ $\pm0.016$ $\pm0.035$ 1
 2005
SKAM sub-GeV
$0.702$ ${}^{+0.032}_{-0.030}$ $\pm0.101$ 2
 2005
SKAM multi-GeV
$0.69$ $\pm0.10$ $\pm0.06$ 3
 2003
SOU2 Calorimeter raw data
4
 1996 B
KAMI Water Cherenkov
$1.00$ $\pm0.15$ $\pm0.08$ 5
 1995
FREJ Calorimeter
$0.60$ ${}^{+0.06}_{-0.05}$ $\pm0.05$ 6
 1994
KAMI sub-GeV
$0.57$ ${}^{+0.08}_{-0.07}$ $\pm0.07$ 7
 1994
KAMI multi-Gev
8
 1992 B
IMB Water Cherenkov
 1 ASHIE 2005 results are based on an exposure of 92 kton yr during the complete Super-Kamiokande I running period. The analyzed data sample consists of fully-contained single-ring ${{\mathit e}}$ -like events with 0.1 GeV/c $<{{\mathit p}_{{e}}}$ and ${{\mathit \mu}}$ -like events 0.2 GeV/c $<{{\mathit p}_{{\mu}}}$ , both having a visible energy $<$ 1.33 GeV. These criteria match the definition used by FUKUDA 1994 .
 2 ASHIE 2005 results are based on an exposure of 92 kton yr during the complete Super-Kamiokande I running period. The analyzed data sample consists of fully-contained single-ring events with visible energy $>$ 1.33 GeV and partially-contained events. All partially-contained events are classified as ${{\mathit \mu}}$ -like.
 3 SANCHEZ 2003 result is based on an exposure of 5.9 kton yr, and updates ALLISON 1999 result. The analyzed data sample consists of fully-contained ${{\mathit e}}$ -flavor and ${{\mathit \mu}}$ -flavor events having lepton momentum $>$ 0.3 GeV/c.
 4 FUKUDA 1996B studied neutron background in the atmospheric neutrino sample observed in the Kamiokande detector. No evidence for the background contamination was found.
 5 DAUM 1995 results are based on an exposure of $2.0$ kton$~$yr which includes the data used by BERGER 1990B. This ratio is for the contained and semicontained events. DAUM 1995 also report $\mathit R({{\mathit \mu}}$ /${{\mathit e}}$ ) = $0.99$ $\pm0.13$ $\pm0.08$ for the total neutrino induced data sample which includes upward going stopping muons and horizontal muons in addition to the contained and semicontained events.
 6 FUKUDA 1994 result is based on an exposure of $7.7$ kton$~$yr and updates the HIRATA 1992 result. The analyzed data sample consists of fully-contained ${{\mathit e}}$ -like events with $0.1<{{\mathit p}_{{e}}}$ $<1.33$ GeV/$\mathit c$ and fully-contained ${{\mathit \mu}}$ -like events with $0.2<{{\mathit p}_{{\mu}}}$ $<1.5$ GeV/$\mathit c$.
 7 FUKUDA 1994 analyzed the data sample consisting of fully contained events with visible energy $>1.33$ GeV and partially contained ${{\mathit \mu}}$ -like events.
 8 BECKER-SZENDY 1992B reports the fraction of nonshowering events (mostly muons from atmospheric neutrinos) as $0.36$ $\pm0.02$ $\pm0.02$, as compared with expected fraction $0.51$ $\pm0.01$ $\pm0.05$. After cutting the energy range to the Kamiokande limits, BEIER 1992 finds $\mathit R({{\mathit \mu}}$ /${{\mathit e}}$ ) very close to the Kamiokande value.
References:
 ASHIE 2005
PR D71 112005 Measurement of Atmospheric Neutrino Oscillation Parameters by Super-Kamiokande I
 SANCHEZ 2003
PR D68 113004 Measurement of the Distributions of Atmospheric Neutrinos in SOUDAN2 and their Interpretation as Neutrino Oscillations
 FUKUDA 1996B
PL B388 397 Study of Neutron Background in the Atmospheric Neutrino Sample in Kamiokande
 DAUM 1995
ZPHY C66 417 Determination of the Atmospheric Neutrino Spectra with the FREJUS Detector
 FUKUDA 1994
PL B335 237 Atmospheric ${{\mathit \nu}_{{\mu}}}$ /${{\mathit \nu}_{{e}}}$ Ratio in the Multi-GeV Energy Range
 BECKER-SZENDY 1992B
PR D46 3720 The ${{\mathit \nu}_{{e}}}$ and ${{\mathit \nu}_{{\mu}}}$ Content of the Atmospheric Flux