pdgLive

(C) Other neutrino mixing results

The LSND collaboration reported in AGUILAR 2001 a signal which is consistent with

{\overset{―}{ν}}_{μ}

\to

{\overset{―}{ν}}_{e}

oscillations. In a three neutrino framework, this would be a measurement of

θ_{12}

and

Δ m_{21}^{2}

. This does not appear to be consistent with most of the other neutrino data. The following listings include results from

ν_{μ}

\to

ν_{e}

,

{\overset{―}{ν}}_{μ}

\to

{\overset{―}{ν}}_{e}

appearance and

ν_{μ}

,

{\overset{―}{ν}}_{μ}

,

ν_{e}

, and

{\overset{―}{ν}}_{e}

disappearance experiments, and searches for

C P T

violation.

sin $^{2} (2 θ)$ for ``Large'' $Δ m^{2}$ ( $ν_{μ}$ $\to$ $ν_{e}$ )

VALUE (

10^{- 3}

)

CL%

DOCUMENT ID

TECN

COMMENT

• • We do not use the following data for averages, fits, limits, etc. • •

6 to 1.0 \times 10^{3}

90

AGUILAR-AREVA..

MBNE

MiniBooNE;

ν

+

\overset{―}{ν}

< 5

90

AGUILAR-AREVA..

MBNE

MiniBooNE;

ν + \overset{―}{ν}

< 7.2

90

OPER

Δ m^{2} >

0.1 eV

^{2}

0.8 to 3

90

AGUILAR-AREVA..

MBNE

MiniBooNE

< 11

90

ICAR

ν_{μ}

\to

ν_{e}

< 6.8

90

ICAR

ν_{μ}

\to

ν_{e}

< 100

90

MBNE

MiniBooNE/SciBooNE

< 1.8

90

AGUILAR-AREVA..

MBNE

MiniBooNE

< 110

90

K2K

Water Cherenkov

< 1.4

90

NOMD

CERN SPS

< 1.6

90

NTEV

NUTEV FNAL

LSND

ν_{μ}

\to

ν_{e}

osc.prob.

0.5 to 30

95

ATHANASSOPOUL..

LSND

ν_{μ}

\to

ν_{e}

< 3.0

90

CHARM/CDHS

< 9.4

90

CHM2

CERN SPS

< 5.6

90

CHM2

CERN SPS

¹

AGUILAR-AREVALO 2021 result is based on a total of

18.75 \times 10^{20}

POT in neutrino mode, and

11.27 \times 10^{20}

POT in anti-neutrino mode. The best fit value is sin

^{2} (2 θ)

=0.807. The allowed region does not extend to large

Δ {m^{2}}_{}

. The quoted value is the entire allowed region of sin

^{2} (2 θ)

at 90

%

C.L. for all values of

Δ {m^{2}}_{}

. Supersedes AGUILAR-AREVALO 2018C.

²	AGUILAR-AREVALO 2018C result is based on $ν_{μ}$ $\to$ $ν_{e}$ appearance of $460.5$ $\pm 99.0$ events; The best fit value is sin $^{2} (2 θ)$ = 0.92. The quoted limit for the two-neutrino mixing angle $θ$ is valid above $Δ$ m $^{2}$ = 0.59 eV $^{2}$ . Superseded by AGUILAR-AREVALO 2021.

³	AGUILAR-AREVALO 2013A result is based on $ν_{μ}$ $\to$ $ν_{e}$ appearance of $162.0$ $\pm 47.8$ events; marginally compatible with two neutrino oscillations. The best fit value is sin $^{2} (2 θ)$ = 0.002.

⁴

ANTONELLO 2013 use the ICARUS T600 detector at LNGS and

\sim

20 GeV beam of

ν_{μ}

from CERN 730 km away to search for an excess of

ν_{e}

events. Two events are found with

3.7

\pm 0.6

expected from conventional sources. This result excludes some parts of the parameter space expected by LSND. Superseded by ANTONELLO 2013A.

⁵	Based on four events with a background of $6.4$ $\pm 0.9$ from conventional sources with an average energy of 20 GeV and 730 km from the source of $ν_{μ}$ .

⁶	MAHN 2012 is a combined fit of MiniBooNE and SciBooNE neutrino data.

⁷	The limit is sin $^{2} 2 θ$ $<$ $0.9 \times 10^{- 3}$ at $Δ {m^{2}}_{}$ = 2 eV $^{2}$ . That value of $Δ {m^{2}}_{}$ corresponds to the smallest mixing angle consistent with the reported signal from LSND in AGUILAR 2001.

⁸	The limit becomes sin $^{2} 2 θ$ $<$ 0.15 at $Δ {m^{2}}_{}$ = $2.8 \times 10^{- 3}$ eV $^{2}$ , the bets-fit value of the $ν_{μ}$ disappearance analysis in K2K.

⁹	AGUILAR 2001 is the final analysis of the LSND full data set of the search for the $ν_{μ}$ $\to$ $ν_{e}$ oscillations. See footnote in preceding table for further details.

¹⁰

ATHANASSOPOULOS 1998 report (

0.26

\pm 0.10

\pm 0.05) %

for the oscillation probability; the value of sin

^{2} 2 θ

for large

Δ m^{2}

is deduced from this probability. See footnote in preceding table for further details, and see the paper for a plot showing allowed regions. If effect is due to oscillation, it is most likely to be intermediate sin

^{2} 2 θ

and

Δ m^{2}

. See also ATHANASSOPOULOS 1998B.

¹¹	LOVERRE 1996 uses the charged-current to neutral-current ratio from the combined CHARM (ALLABY 1986) and CDHS (ABRAMOWICZ 1986) data from 1986.

¹²	VILAIN 1994C limit derived by combining the $ν_{μ}$ and ${\overset{―}{ν}}_{μ}$ data assuming $C P$ conservation.

AGUILAR-AREVALO

PR D103 052002

Updated MiniBooNE neutrino oscillation results with increased data and new background studies

AGUILAR-AREVALO

PRL 121 221801

Significant Excess of ElectronLike Events in the MiniBooNE Short-Baseline Neutrino Experiment

JHEP 1307 004

Search for

ν_{μ} \to ν_{e}

Oscillations with the OPERA Experiment in the CNGS Beam

AGUILAR-AREVALO

PRL 110 161801

Improved Search for

{\overset{―}{ν}}_{μ} \leftrightarrow {\overset{―}{ν}}_{e}

Oscillations in the MiniBooNE Experiment

EPJ C73 2345

Experimental Search for the "LSND Anomaly" with the ICARUS Detector in the CNGS Neutrino Beam

EPJ C73 2599

Search for Anomalies in the

ν_{e}

Appearance from a

ν_{μ}

Beam

PR D85 032007

Dual Baseline Search for Muon Neutrino Disappearance at 0.5 eV

^{2}

<

Δ

m

^{2}

< 40 eV

^{2}

AGUILAR-AREVALO

PRL 98 231801

Search for Electron Neutrino Appearance at the

Δ m^{2} \sim

1 eV

^{2}

Scale

PRL 93 051801

Search for Electron Neutrino Appearance in 250 km Long-baseline Experiment

PL B570 19

Search for

ν_{μ}

\to

ν_{e}

Oscillations in the NOMAD Experiment

PRL 89 011804

A Search for

ν_{μ} - ν_{e}

and

{\overset{―}{ν}}_{μ} - {\overset{―}{ν}}_{e}

Oscillations at NUTeV

PR D64 112007

Evidence for Neutrino Oscillations from the Observation of

{\overset{―}{ν}}_{e}

Appearance in a

{\overset{―}{ν}}_{μ}

Beam

ATHANASSOPOULOS

PRL 81 1774

Evidence for

ν_{μ}

\leftrightarrow

ν_{e}

Oscillations from the LSND

PL B370 156

Limits on

ν_{μ}

Oscillations from the Measurement of the Ratio of 0

μ^{\pm}

to 1

μ^{\pm}

Events at the CERN Narrow Band Neutrino Beam

ZPHY C64 539

Search for Muon to Electron Neutrino Oscillations

Except where otherwise noted, content of the 2024 Review of Particle Physics is licensed under a Creative Commons Attribution 4.0 International (CC BY 4.0) license. The publication of the Review of Particle Physics is supported by US DOE, MEXT (Japan), INFN (Italy) and CERN. Individual collaborators receive support for their PDG activities from their respective institutes or funding agencies. © 2024. See LBNL disclaimers.