# ${{\boldsymbol \mu}}$ ELECTRIC DIPOLE MOMENT (d) INSPIRE search

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
 2009
MUG2 $\pm{}$ Storage ring
• • • We do not use the following data for averages, fits, limits, etc. • • •
$-0.1$ $\pm1.0$ 2
 2009
MUG2 + Storage ring
$-0.1$ $\pm0.7$ 3
 2009
MUG2 - Storage ring
$-3.7$ $\pm3.4$ 4
 1978
CNTR $\pm{}$ Storage ring
$8.6$ $\pm4.5$
 1978
CNTR + Storage ring
$0.8$ $\pm4.3$
 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  Also reported as the limit of $\vert$d(${{\mathit \mu}^{+}})\vert$ $<$ $2.1 \times 10^{-19}$ $\mathit e$ cm at 95$\%$ CL.
3  Also reported as the limit of $\vert$d(${{\mathit \mu}^{-}})\vert$ $<$ $1.5 \times 10^{-19}$ $\mathit e$ cm at 95$\%$ CL.
4  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:
 BENNETT 2009
PR D80 052008 Improved Limit on the Muon Electric Dipole Moment
 BAILEY 1978
JP G4 345 New Limits on the Electric Dipole Moment of Positive and Negative Muons