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.

${\mathit \sigma (}$ ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit e}^{\pm}}{{\mathit \tau}^{\mp}}{)}$ $/$ ${\mathit \sigma (}$ ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}{)}$

INSPIRE   PDGID:
S003RET
VALUE CL% DOCUMENT ID TECN  COMMENT
$\bf{<8.9 \times 10^{-6}}$ 95
AUBERT
2007P
 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
GOMEZ-CADE..
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 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit \tau}^{-}}$
GOMEZ-CADENAS 1991
PRL 66 1007 A Search for Elastic Nondiagonal Lepton Pair Production in ${{\mathit e}^{+}}{{\mathit e}^{-}}$ Annihilation at $\sqrt {s }$ = 29 GeV