(C) Other neutrino mixing results

The LSND collaboration reported in AGUILAR 2001 a signal which is consistent with ${{\overline{\mathit \nu}}_{{{\mu}}}}$ $\rightarrow$ ${{\overline{\mathit \nu}}_{{{e}}}}$ oscillations. In a three neutrino framework, this would be a measurement of $\theta _{12}$ and $\Delta \mathit m{}^{2}_{21}$. This does not appear to be consistent with most of the other neutrino data. The following listings include results from ${{\mathit \nu}_{{{\mu}}}}$ $\rightarrow$ ${{\mathit \nu}_{{{e}}}}$, ${{\overline{\mathit \nu}}_{{{\mu}}}}$ $\rightarrow$ ${{\overline{\mathit \nu}}_{{{e}}}}$ appearance and ${{\mathit \nu}_{{{\mu}}}}$, ${{\overline{\mathit \nu}}_{{{\mu}}}}$, ${{\mathit \nu}_{{{e}}}}$, and ${{\overline{\mathit \nu}}_{{{e}}}}$ disappearance experiments, and searches for $\mathit CPT$ violation.

$\Delta \mathit m{}^{2}$ for sin$^2(2{}\theta )$ = 1 ( ${{\overline{\mathit \nu}}_{{{\mu}}}}$ $\rightarrow$ ${{\overline{\mathit \nu}}_{{{e}}}}$)

INSPIRE   PDGID:
S067D2
VALUE (eV${}^{2}$) CL% DOCUMENT ID TECN  COMMENT
• • We do not use the following data for averages, fits, limits, etc. • •
$0.023\text{ to }0.060 $ 90 1
AGUILAR-AREVA..
2013A
 MBNE MiniBooNE
$<0.16$ 90 2
CHENG
2012
MBNE MiniBooNE/SciBooNE
$\text{0.03 - 0.09}$ 90 3
AGUILAR-AREVA..
2010
MBNE E$_{{{\mathit \nu}}}>$ 475 MeV
$\text{0.03 - 0.07}$ 90 4
AGUILAR-AREVA..
2010
MBNE E$_{{{\mathit \nu}}}>$ 200 MeV
$<0.06$ 90
AGUILAR-AREVA..
2009B
 MBNE MiniBooNE
$<0.055$ 90 5
ARMBRUSTER
2002
KAR2 Liquid Sci. calor.
$<2.6$ 90
AVVAKUMOV
2002
NTEV NUTEV FNAL
$\text{0.03 - 0.05}$ 6
AGUILAR
2001
LSND LAMPF
$\text{0.05 - 0.08}$ 90 7
ATHANASSOPOUL..
1996
LSND LAMPF
$\text{0.048 - 0.090}$ 80 8
ATHANASSOPOUL..
1995
$<0.07$ 90 9
HILL
1995
$<0.9$ 90
VILAIN
1994C
 CHM2 CERN SPS
$<0.14$ 90 10
FREEDMAN
1993
CNTR LAMPF
1  Based on ${{\overline{\mathit \nu}}_{{{\mu}}}}$ $\rightarrow$ ${{\overline{\mathit \nu}}_{{{e}}}}$ appearance of $78.4$ $\pm28.5$ events. The best fit values are $\Delta $m${}^{2}$ = 0.043 eV${}^{2}$ and sin$^22\theta $ = 0.88.
2  CHENG 2012 is a combined fit of MiniBooNE and SciBooNE antineutrino data.
3  This value is for a two neutrino oscillation analysis for excess antineutrino events with E$_{{{\mathit \nu}}}>$ 475 MeV. The best fit is at 0.07. The allowed region is consistent with LSND reported by AGUILAR 2001. Supercedes AGUILAR-AREVALO 2009B.
4  This value is for a two neutrino oscillation analysis for excess antineutrino events with E$_{{{\mathit \nu}}}>$ 200 MeV with subtraction of the expected 12 events low energy excess seen in the neutrino component of the beam. The best fit value is 0.007 for $\Delta \mathit m{}^{2}$ = 4.4 eV${}^{2}$.
5  ARMBRUSTER 2002 is the final analysis of the KARMEN$~$2 data for $17.7~$m distance from the ISIS stopped pion and muon neutrino source. It is a search for ${{\overline{\mathit \nu}}_{{{e}}}}$, detected by the inverse $\beta $-decay reaction on protons and ${}^{12}\mathrm {C}$. 15 candidate events are observed, and $15.8$ $\pm0.5$ background events are expected, hence no oscillation signal is detected. The results exclude large regions of the parameter area favored by the LSND experiment.
6  AGUILAR 2001 is the final analysis of the LSND full data set. It is a search for ${{\overline{\mathit \nu}}_{{{e}}}}$ 30$~$m from LAMPF beam stop. Neutrinos originate mainly for ${{\mathit \pi}^{+}}$ decay at rest. ${{\overline{\mathit \nu}}_{{{e}}}}$ are detected through ${{\overline{\mathit \nu}}_{{{e}}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit n}}$ (20$<\mathit E_{{{\mathit e}^{+}}}<60$ MeV) in delayed coincidence with ${{\mathit n}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit d}}{{\mathit \gamma}}$. Authors observe $87.9$ $\pm22.4$ $\pm6.0$ total excess events. The observation is attributed to ${{\overline{\mathit \nu}}_{{{\mu}}}}$ $\rightarrow$ ${{\overline{\mathit \nu}}_{{{e}}}}$ oscillations with the oscillation probability of $0.264$ $\pm0.067$ $\pm0.045\%$, consistent with the previously published result. Taking into account all constraints, the most favored allowed region of oscillation parameters is a band of $\Delta \mathit m{}^{2}$ from $0.2 - 2.0~$eV${}^{2}$. Supersedes ATHANASSOPOULOS 1995, ATHANASSOPOULOS 1996, and ATHANASSOPOULOS 1998.
7  ATHANASSOPOULOS 1996 is a search for ${{\overline{\mathit \nu}}_{{{e}}}}$ 30$~$m from LAMPF beam stop. Neutrinos originate mainly from ${{\mathit \pi}^{+}}$ decay at rest. ${{\overline{\mathit \nu}}_{{{e}}}}$ could come from either ${{\overline{\mathit \nu}}_{{{\mu}}}}$ $\rightarrow$ ${{\overline{\mathit \nu}}_{{{e}}}}$ or ${{\mathit \nu}_{{{e}}}}$ $\rightarrow$ ${{\overline{\mathit \nu}}_{{{e}}}}$; our entry assumes the first interpretation. They are detected through ${{\overline{\mathit \nu}}_{{{e}}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit n}}$ (20$~$MeV $<\mathit E_{{{\mathit e}^{+}}}<$60 MeV) in delayed coincidence with ${{\mathit n}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit d}}{{\mathit \gamma}}$. Authors observe $51$ $\pm20$ $\pm8$ total excess events over an estimated background $12.5$ $\pm2.9$. ATHANASSOPOULOS 1996B is a shorter version of this paper.
8  ATHANASSOPOULOS 1995 error corresponds to the $1.6\sigma $ band in the plot. The expected background is $2.7$ $\pm0.4$ events. Corresponds to an oscillation probability of ($0.34$ ${}^{+0.20}_{-0.18}$ $\pm0.07)\%$. For a different interpretation, see HILL 1995. Replaced by ATHANASSOPOULOS 1996.
9  HILL 1995 is a report by one member of the LSND Collaboration, reporting a different conclusion from the analysis of the data of this experiment (see ATHANASSOPOULOS 1995). Contrary to the rest of the LSND Collaboration, Hill finds no evidence for the neutrino oscillation ${{\overline{\mathit \nu}}_{{{\mu}}}}$ $\rightarrow$ ${{\overline{\mathit \nu}}_{{{e}}}}$ and obtains only upper limits.
10  FREEDMAN 1993 is a search at LAMPF for ${{\overline{\mathit \nu}}_{{{e}}}}$ generated from any of the three neutrino types ${{\mathit \nu}_{{{\mu}}}}$, ${{\overline{\mathit \nu}}_{{{\mu}}}}$, and ${{\mathit \nu}_{{{e}}}}$ which come from the beam stop. The ${{\overline{\mathit \nu}}_{{{e}}}}$'s would be detected by the reaction ${{\overline{\mathit \nu}}_{{{e}}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit n}}$. FREEDMAN 1993 replaces DURKIN 1988.
References