Testing the Standard Model by precision measurement of the weak charges of quarks
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In a global analysis of the latest parity-violating electron scattering measurements on nuclear targets, we demonstrate a significant improvement in the experimental knowledge of the weak neutral-current lepton-quark interactions at low energy. The precision of this new result, combined with earlier atomic parity-violation measurements, places tight constraints on the size of possible contributions from physics beyond the Standard Model. Consequently, this result improves the lower-bound on the scale of relevant new physics to ~1 TeV.
4 pages, 3 figures; v2: further details on extraction of electroweak parameters, new figure
4 pages, 3 figures; v2: further details on extraction of electroweak parameters, new figure