${{\mathit \mu}}$ ELECTRIC DIPOLE MOMENT (d)

INSPIRE   JSON  (beta) PDGID:
S004EDM
A nonzero value is forbidden by both $\mathit T$ invariance and $\mathit P$ invariance.
VALUE ($ 10^{-19} $ $\mathit e~$cm) CL% DOCUMENT ID TECN CHG  COMMENT
$\bf{<1.8}$ 95 1
BENNETT
2009
MUG2 $\pm{}$ Storage ring
• • We do not use the following data for averages, fits, limits, etc. • •
$<0.19$ 90 2
EMA
2022
theory limit
$-0.1$ $\pm1.0$ 3
BENNETT
2009
MUG2 + Storage ring
$-0.1$ $\pm0.7$ 4
BENNETT
2009
MUG2 - Storage ring
$-3.7$ $\pm3.4$ 5
BAILEY
1978
CNTR $\pm{}$ Storage ring
$8.6$ $\pm4.5$
BAILEY
1978
CNTR + Storage ring
$0.8$ $\pm4.3$
BAILEY
1978
CNTR - Storage ring
1  This is the combination of the two BENNETT 2009 measurements quoted here separately for ${{\mathit \mu}^{+}}$ and ${{\mathit \mu}^{-}}$. The result is also presented as a measurement of ($0.0$ $\pm0.9$) $ \times 10^{-19}\mathit e$ cm.
2  EMA 2022 determine indirect constraints on $\vert {{\mathit \mu}_{{{EDM}}}}\vert $ from EDM measurements performed on heavy atoms and molecules, based on the muon-loop induced light-by-light CP-odd amplitude.
3  Also reported as the limit of $\vert $d(${{\mathit \mu}^{+}})\vert $ $<$ $2.1 \times 10^{-19}$ $\mathit e$ cm at 95$\%$ CL.
4  Also reported as the limit of $\vert $d(${{\mathit \mu}^{-}})\vert $ $<$ $1.5 \times 10^{-19}$ $\mathit e$ cm at 95$\%$ CL.
5  This is the combination of the two BAILEY 1978 results quoted here separately for ${{\mathit \mu}^{+}}$ and ${{\mathit \mu}^{-}}$. BAILEY 1978 uses the convention d = 1/2 $\cdot{}$ (d$_{{{\mathit \mu}^{+}}}−$ d$_{{{\mathit \mu}^{-}}}$) and reports $3.7$ $\pm3.4$. We convert their result to use the same convention as BENNETT 2009.
Conservation Laws:
TIME REVERSAL ($\mathit T$) INVARIANCE
PARITY ($\mathit P$) INVARIANCE
References