The Qweak Experiment: A Search for New Physics at the TeV Scale via a Measurement of the Proton's Weak Charge [article]

R. D. Carlini, J.M. Finn, S. Kowalski, S. A. Page, D. S. Armstrong, A. Asaturyan, T. Averett, J. Benesch, J. Birchall, P. Bosted, A. Bruell, C. L. Capuano (+71 others)
2012 arXiv   pre-print
We propose a new precision measurement of parity-violating electron scattering on the proton at very low Q^2 and forward angles to challenge predictions of the Standard Model and search for new physics. A unique opportunity exists to carry out the first precision measurement of the proton's weak charge, Q_W =1 - 4sin^2θ_W. A 2200 hour measurement of the parity violating asymmetry in elastic ep scattering at Q^2=0.03 (GeV/c)^2 employing 180 μA of 85 determine the proton's weak charge with
more » ... mately 4 and systematic errors. The Standard Model makes a firm prediction of Q_W, based on the running of the weak mixing angle from the Z0 pole down to low energies, corresponding to a 10 sigma effect in this experiment.
arXiv:1202.1255v2 fatcat:4jfnrcqzxzachjbcgbxawxg2ui