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$\vert {{\mathit q}_{{p}}}+{{\mathit q}_{{e}}}\vert /{{\mathit e}}$

INSPIRE   PDGID:

S016DQ

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 BRESSI 2011 Neutrality of SF$_{6}$ • • We do not use the following data for averages, fits, limits, etc. • • $<3.2 \times 10^{-20}$ 2 SENGUPTA 2000 binary pulsar $<0.8 \times 10^{-21}$ MARINELLI 1984 Magnetic levitation $<1.0 \times 10^{-21}$ 1 DYLLA 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