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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

SPEC

$<2.2 \times 10^{-7}$

90

OSPK

References:

PRL 28 1469

Search for the Reaction ${{\mathit \mu}^{-}}$ ${}^{}\mathrm {Cu}$ $\rightarrow$ ${{\mathit e}^{+}}{}^{}\mathrm {Co}$

NC 26 261

Search for Neutrinoless Coherent Nuclear Capture of ${{\mathit \mu}^{-}}$ Mesons

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