$\vert {{\boldsymbol q}_{{p}}}+{{\boldsymbol q}_{{e}}}\vert /{{\boldsymbol e}}$ INSPIRE search

See BRESSI 2011 for a summary of experiments on the neutrality of matter. See also ${{\mathit n}}$ CHARGE'' in the neutron Listings.
VALUE DOCUMENT ID  COMMENT
$\bf{<1 \times 10^{-21}}$ 1
 2011
Neutrality of SF$_{6}$
• • • We do not use the following data for averages, fits, limits, etc. • • •
$<3.2 \times 10^{-20}$ 2
 2000
binary pulsar
$<0.8 \times 10^{-21}$
 1984
Magnetic levitation
$<1.0 \times 10^{-21}$ 1
 1973
Neutrality of SF$_{6}$
1  BRESSI 2011 uses the method of DYLLA 1973 but finds serious errors in that experiment that greatly reduce its accuracy. The BRESSI 2011 limit assumes that ${{\mathit n}}$ $\rightarrow$ ${{\mathit p}}{{\mathit e}^{-}}{{\mathit \nu}_{{e}}}$ conserves charge. Thus the limit applies equally to the charge of the neutron.
2  SENGUPTA 2000 uses the difference between the observed rate of of rotational energy loss by the binary pulsar PSR B1913+16 and the rate predicted by general relativity to set this limit. See the paper for assumptions.
Conservation Laws:
 ELECTRIC CHARGE ($\mathit Q$)
References:
 BRESSI 2011
PR A83 052101 Testing the Neutrality of Matter by Acoustic Means in a Spherical Resonator
 SENGUPTA 2000
PL B484 275 Binary Pulsar PSR B1913+16 Constrains the Electron Proton Charge Asymmetry
 MARINELLI 1984
PL 137B 439 The Electric Neutrality of Matter: a Summary
 DYLLA 1973
PR A7 1224 Neutrality of Molecules by a New Method