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

Forbidden by total lepton number conservation.

${\mathit \sigma (}$ ${{\mathit \mu}^{-}}$ ${}^{127}\mathrm {I}$ $\rightarrow$ ${{\mathit e}^{+}}{}^{127}\mathrm {Sb}^{*}{)}$ / ${\mathit \sigma (}$ ${{\mathit \mu}^{-}}$ ${}^{127}\mathrm {I}$ $\rightarrow$ anything${)}$

INSPIRE  
VALUE CL% DOCUMENT ID TECN  COMMENT
$\bf{<3 \times 10^{-10}}$ 90 1
ABELA
1980
CNTR Radiochemical tech.
1  ABELA 1980 is upper limit for ${{\mathit \mu}^{-}}{{\mathit e}^{+}}$ conversion leading to particle-stable states of ${}^{127}\mathrm {Sb}$. Limit for total conversion rate is higher by a factor less than 4 (G. Backenstoss, private communication).
Conservation Laws:
TOTAL LEPTON NUMBER
References:
ABELA 1980
PL 95B 318 New Upper Limit for ${{\mathit \mu}^{-}}$ $\rightarrow$ ${{\mathit e}^{+}}$ Conversion