# LIMITS ON LEPTON-FLAVOR VIOLATION IN PRODUCTION

Forbidden by lepton family number conservation.
This section was added for the 2008 edition of this $\mathit Review$ and is not complete. For a list of further measurements see references in the papers listed below.

# ${\boldsymbol \sigma (}$ ${{\boldsymbol e}^{+}}$ ${{\boldsymbol e}^{-}}$ $\rightarrow$ ${{\boldsymbol e}^{\pm}}{{\boldsymbol \tau}^{\mp}}{)}$ $/$ ${\boldsymbol \sigma (}$ ${{\boldsymbol e}^{+}}$ ${{\boldsymbol e}^{-}}$ $\rightarrow$ ${{\boldsymbol \mu}^{+}}{{\boldsymbol \mu}^{-}}{)}$ INSPIRE search

VALUE CL% DOCUMENT ID TECN  COMMENT
$\bf{<8.9 \times 10^{-6}}$ 95
 2007 P
BABR ${{\mathit e}^{+}}{{\mathit e}^{-}}$ at $\mathit E_{{\mathrm {cm}}}$ = 10.58 GeV
• • • We do not use the following data for averages, fits, limits, etc. • • •
$<1.8 \times 10^{-3}$ 95
 1991
MRK2 ${{\mathit e}^{+}}{{\mathit e}^{-}}$ at $\mathit E_{{\mathrm {cm}}}$ = 29 GeV
Conservation Laws:
 LEPTON FAMILY NUMBER
References:
 AUBERT 2007P
PR D75 031103 Search for the Reactions ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \mu}^{+}}{{\mathit \tau}^{-}}$ and ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit \tau}^{-}}$
PRL 66 1007 A Search for Elastic Nondiagonal Lepton Pair Production in ${{\mathit e}^{+}}{{\mathit e}^{-}}$ Annihilation at $\sqrt {s }$ = 29 GeV