${{\mathit p}}$ ELECTRIC DIPOLE MOMENT

INSPIRE   PDGID:
S016EDM
A nonzero value is forbidden by both $\mathit T$ invariance and $\mathit P$ invariance.
VALUE ($ 10^{-23} $ $\mathit e~$cm) DOCUMENT ID TECN  COMMENT
$\bf{<0.021}$ 1
SAHOO
2017
Theory plus ${}^{199}\mathrm {Hg}$ atom EDM
• • We do not use the following data for averages, fits, limits, etc. • •
$<0.54$ 1
DMITRIEV
2003
Theory plus ${}^{199}\mathrm {Hg}$ atom EDM
$-3.7$ $\pm6.3$
CHO
1989
NMR Tl F molecules
$<400$
DZUBA
1985
THEO Uses ${}^{129}\mathrm {Xe}$ moment
$130$ $\pm200$ 2
WILKENING
1984
$900$ $\pm1400$ 3
WILKENING
1984
$700$ $\pm900$
HARRISON
1969
MBR Molecular beam
1  SAHOO 2017 and DMITRIEV 2003 are not direct measurements of the proton electric dipole moment. They use theory to calculate this limit from the limit on the electric dipole moment of the ${}^{199}\mathrm {Hg}$ atom.
2  This WILKENING 1984 value includes a finite-size effect and a magnetic effect.
3  This WILKENING 1984 value is more cautious than the other and excludes the finite-size effect, which relies on uncertain nuclear integrals.
Conservation Laws:
TIME REVERSAL ($\mathit T$) INVARIANCE
PARITY ($\mathit P$) INVARIANCE
References