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

INSPIRE   JSON  (beta) 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
01
 
Theory plus ${}^{199}\mathrm {Hg}$ atom EDM
• • We do not use the following data for averages, fits, limits, etc. • •
$<0.54$ 1
DMITRIEV
00
 
Theory plus ${}^{199}\mathrm {Hg}$ atom EDM
$-3.7$ $\pm6.3$
CHO
98
 
NMR Tl F molecules
$<400$
DZUBA
98
 
THEO Uses ${}^{129}\mathrm {Xe}$ moment
$130$ $\pm200$ 2
WILKENING
98
 
$900$ $\pm1400$ 3
WILKENING
98
 
$700$ $\pm900$
HARRISON
96
 
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