# Peak search test INSPIRE search

Limits on $\vert \mathit U_{{{\mathit \mu}}\mathit x}\vert ^2$ as function of ${\mathit m}_{{{\mathit \nu}_{{x}}}}$
VALUE CL% DOCUMENT ID TECN  COMMENT
• • • We do not use the following data for averages, fits, limits, etc. • • •
$<1 - 10 \times 10^{-4}$ 1
 1996
CNTR ${\mathit m}_{{{\mathit \nu}_{{x}}}}$ = $30 - 33.91$ MeV
$<2 \times 10^{-5}$ 95 2
 1981
${\mathit m}_{{{\mathit \nu}_{{x}}}}$=70 MeV
$<3 \times 10^{-6}$ 95 2
 1981
${\mathit m}_{{{\mathit \nu}_{{x}}}}$=210 MeV
$<3 \times 10^{-6}$ 95 2
 1981
${\mathit m}_{{{\mathit \nu}_{{x}}}}$=230 MeV
$<6 \times 10^{-6}$ 95 3
 1981
${\mathit m}_{{{\mathit \nu}_{{x}}}}$=240 MeV
$<5 \times 10^{-7}$ 95 3
 1981
${\mathit m}_{{{\mathit \nu}_{{x}}}}$=280 MeV
$<6 \times 10^{-6}$ 95 3
 1981
${\mathit m}_{{{\mathit \nu}_{{x}}}}$=300 MeV
$<0.01$ 95
 1981
${\mathit m}_{{{\mathit \nu}_{{x}}}}$=7 MeV
$<3 \times 10^{-3}$ 95 4
 1981
${\mathit m}_{{{\mathit \nu}_{{x}}}}$=33 MeV
$<1 \times 10^{-4}$ 68 5
 1981
THEO ${\mathit m}_{{{\mathit \nu}_{{x}}}}$=13 MeV
$<3 \times 10^{-5}$ 68 5
 1981
THEO ${\mathit m}_{{{\mathit \nu}_{{x}}}}$=33 MeV
$<6 \times 10^{-3}$ 68 6
 1981
THEO ${\mathit m}_{{{\mathit \nu}_{{x}}}}$=80 MeV
$<5 \times 10^{-3}$ 68 6
 1981
THEO ${\mathit m}_{{{\mathit \nu}_{{x}}}}$=120 MeV
1  BRYMAN 1996 search for massive unconventional neutrinos of mass ${\mathit m}_{{{\mathit \nu}_{{x}}}}$ in ${{\mathit \pi}^{+}}$ decay. They interpret the result as an upper limit for the admixture of a heavy sterile or otherwise
2  ${{\mathit K}^{+}}$ $\rightarrow$ ${{\mathit \mu}^{+}}{{\mathit \nu}_{{\mu}}}$ peak search experiment.
3  Analysis of experiment on ${{\mathit K}^{+}}$ $\rightarrow$ ${{\mathit \mu}^{+}}{{\mathit \nu}_{{\mu}}}{{\mathit \nu}_{{x}}}{{\overline{\mathit \nu}}_{{x}}}$ decay.
4  ${{\mathit \pi}^{+}}$ $\rightarrow$ ${{\mathit \mu}^{+}}{{\mathit \nu}_{{\mu}}}$ peak search experiment.
5  Analysis of magnetic spectrometer experiment, bubble chamber experiment, and emulsion experiment on ${{\mathit \pi}^{+}}$ $\rightarrow$ ${{\mathit \mu}^{+}}{{\mathit \nu}_{{\mu}}}$ decay.
6  Analysis of magnetic spectrometer experiment on ${{\mathit K}}$ $\rightarrow$ ${{\mathit \mu}}$ , ${{\mathit \nu}_{{\mu}}}$ decay.
References:
 BRYMAN 1996
PR D53 558 Search for Massive Neutrinos in ${{\mathit \pi}^{+}}$ $\rightarrow$ ${{\mathit \mu}^{+}}{{\mathit \nu}}$ Decay
 ASANO 1981
PL 104B 84 Search for Heavy Neutrino Emitted in ${{\mathit K}^{+}}$ $\rightarrow$ ${{\mathit \mu}^{+}}{{\mathit \nu}}$ Decay
 CALAPRICE 1981
PL 106B 175 Search for Finite Mass Neutrinos in the Decay ${{\mathit \pi}^{+}}$ $\rightarrow$ ${{\mathit \mu}^{+}}{{\mathit \nu}_{{\mu}}}$
 SHROCK 1981
PR D24 1232 General Theory of Weak Processes Involving Neutrinos. 1. Leptonic Pseudoscalar Meson Decays, with Associated Tests for, and Bounds on, Neutrino Masses and Lepton Mixing