# $\vert \boldsymbol q_{{{\boldsymbol e}^{+}}}~+~\boldsymbol q_{{{\boldsymbol e}^{-}}}\vert /{{\boldsymbol e}}$ INSPIRE search

A test of $\mathit CPT$ invariance. See also similar tests involving the proton.
VALUE DOCUMENT ID TECN  COMMENT
$\bf{<4 \times 10^{-8}}$ 1
 1992
RVUE
• • • We do not use the following data for averages, fits, limits, etc. • • •
$<2 \times 10^{-18}$ 2
 1995
THEO Vacuum polarization
$<1 \times 10^{-18}$ 3
 1992
THEO Vacuum polarization
1  HUGHES 1992 uses recent measurements of Rydberg-energy and cyclotron-frequency ratios.
2  SCHAEFER 1995 removes model dependency of MUELLER 1992 .
3  MUELLER 1992 argues that an inequality of the charge magnitudes would, through higher-order vacuum polarization, contribute to the net charge of atoms.
Conservation Laws:
 $\mathit CPT$ INVARIANCE
References:
 SCHAEFER 1995
PR A51 838 Vacuum Polarization as a Test of $\mathit C$ and $\mathit CPT$ Invariance
 HUGHES 1992
PRL 69 578 Electric Charges of Positrons and Antiprotons
 MUELLER 1992
PRL 69 3432 Vacuum Polarization and the Electric Charge of the Positron