LIMIT ON ${{\mathit \mu}^{-}}$ $\rightarrow$ ${{\mathit e}^{+}}$ CONVERSION

Forbidden by total lepton number conservation.

${\mathit \sigma (}$ ${{\mathit \mu}^{-}}$ ${}^{}\mathrm {Cu}$ $\rightarrow$ ${{\mathit e}^{+}}{}^{}\mathrm {Co}{)}$ / ${\mathit \sigma (}$ ${{\mathit \mu}^{-}}$ ${}^{}\mathrm {Cu}$ $\rightarrow$ ${{\mathit \nu}_{{\mu}}}{}^{}\mathrm {Ni}{)}$

VALUE CL% DOCUMENT ID TECN
• • We do not use the following data for averages, fits, limits, etc. • •
$<2.6 \times 10^{-8}$ 90
 1972
SPEC
$<2.2 \times 10^{-7}$ 90
 1962
OSPK
References:
 BRYMAN 1972
PRL 28 1469 Search for the Reaction ${{\mathit \mu}^{-}}$ ${}^{}\mathrm {Cu}$ $\rightarrow$ ${{\mathit e}^{+}}{}^{}\mathrm {Co}$
 CONFORTO 1962
NC 26 261 Search for Neutrinoless Coherent Nuclear Capture of ${{\mathit \mu}^{-}}$ Mesons