We have carried out a precision measurement of the parity-violating asymmetry A PV in the scattering of longitudinally polarized electrons off electrons in a liquid-hydrogen target. The measurement was performed with the 50GeV beam line at SLAC. The final result with the full data set collected in three production runs is A PV = - 131±14 (stat) ±10 (syst) parts per billion. The result leads to new limits on possible contact interactions at the TeV scale. We discuss future prospects for more precise measurements.
PACS.12.15.Mm Neutral currents 11.30.Er Charge conjugation, parity, time reversal, and other discrete symmetries
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