#### ${{\mathit \Lambda}}$ ELECTRIC DIPOLE MOMENT

A nonzero value is forbidden by both $\mathit T$ invariance and $\mathit P$ invariance.
VALUE ($10^{-16}$ $\mathit e~$cm) CL% DOCUMENT ID TECN
$\bf{<1.5}$ 95 1
 1981
SPEC
• • We do not use the following data for averages, fits, limits, etc. • •
$<100$ 95 2
 1971
EMUL
$<500$ 95
 1966
EMUL
 1 PONDROM 1981 measures ($-3.0$ $\pm7.4$) $\times 10^{-17}{{\mathit e}}$ -cm.
 2 BARONI 1971 measures ($-5.9$ $\pm2.9$) $\times 10^{-15}{{\mathit e}}$ -cm.
Conservation Laws:
TIME REVERSAL ($\mathit T$) INVARIANCE
PARITY ($\mathit P$) INVARIANCE
References:
 PONDROM 1981
PR D23 814 New Limit on the Electric Dipole Moment of the ${{\mathit \Lambda}}$ Hyperon
 BARONI 1971
LNC 2 1256 An Upper Limit of the Electric Dipole Moment of the ${{\mathit \Lambda}}$ Hyperon
 GIBSON 1966
NC 45A 882 An Upper Limit to the Electric Dipole Moment of the ${{\mathit \Lambda}}$