Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..apri13009s&link_type=abstract
American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As
Astronomy and Astrophysics
Astrophysics
Scientific paper
Historically tests of the Standard Model have been mostly performed using increasingly higher energies. However, a precision experimental study of the evolution of the weak mixing angle sin^2θw to lower energies has yet to provide strong constraints. A unique opportunity exists at Jlab, a world-leading laboratory in parity violation measurements, to challenge the predictions of the Standard Model at very low Q^2 by carrying out the first precision measurement of the proton's weak charge, Q^p_W=1-4sin^2θ_w. Any deviation of sin^2θ_w, extracted from the proton's weak charge, from the prediction of the Standard Model at low Q^2 would be a signal of new physics. Agreement with the Standard Model would place new and significant constraints on possible extensions. The challenges in the experimental design for a precise measurement of the 0.31 ppm asymmetry at Q^2=0.03 ; GeV^2 with an accuracy of 4.2%, which will provide a ~=0.2% accuracy in the measurement of sin^2θ_w, will be discussed.
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