학술논문
The Qweak Experiment: A Search for New Physics at the TeV Scale via a Measurement of the Proton's Weak Charge
Document Type
Working Paper
Author
Carlini, R. D.; Finn, J. M.; Kowalski, S.; Page, S. A.; Armstrong, D. S.; Asaturyan, A.; Averett, T.; Benesch, J.; Birchall, J.; Bosted, P.; Bruell, A.; Capuano, C. L.; Cates, G.; Carrigee, C.; Chattopadhyay, S.; Covrig, S.; Davis, C. A.; Dow, K.; Dunne, J.; Dutta, D.; Ent, R.; Erler, J.; Falk, W.; Fenker, H.; Forest, T. A.; Franklin, W.; Gaskell, D.; Gericke, M.; Grames, J.; Grimm, K.; Hersman, F. W.; Higinbotham, D.; Holtrop, M.; Hoskins, J. R.; Johnston, K.; Ihloff, E.; Jones, M.; Jones, R.; Joo, K.; Kelsey, J.; Keppel, C.; Khol, M.; King, P.; Korkmaz, E.; Leacock, J.; Leckey, J. P.; Lee, L.; Lung, A.; Mack, D.; Majewski, S.; Mammei, J.; Martin, J.; Meekins, D.; Micherdzinska, A.; Mkrtchyan, A.; Mkrtchyan, H.; Morgan, N.; Myers, K. E.; Narayan, A.; Opper, A. K.; Pan, J.; Paschke, K.; Pitt, M.; Poelker, M.; Prok, Y.; Ramsay, W. D.; Ramsey-Musolf, M.; Roche, J.; Simicevic, N.; Smith, G.; Smith, T.; Souder, P.; Spayde, D.; Stokes, B. E.; Suleiman, R.; Tadevosyan, V.; Tsentalovich, E.; van Oers, W. T. H.; Vulcan, W.; Wang, P.; Wells, S.; Wood, S. A.; Yang, S.; Young, R.; Zhu, H.; Zorn, C.
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Subject
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Abstract
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, $Q_W =1 - 4\sin^2\theta_W$. A 2200 hour measurement of the parity violating asymmetry in elastic ep scattering at Q^2=0.03 (GeV/c)^2 employing 180 $\mu$A of 85% polarized beam on a 35 cm liquid Hydrogen target will determine the proton's weak charge with approximately 4% combined statistical 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.
Comment: Proposal to Jefferson Lab Program Advisory Committee, December 2007. 93 pages, 44 figures. Uploaded here so a permanent copy is available, and for other papers to use arXiv version as reference First four authors are the spokespersons
Comment: Proposal to Jefferson Lab Program Advisory Committee, December 2007. 93 pages, 44 figures. Uploaded here so a permanent copy is available, and for other papers to use arXiv version as reference First four authors are the spokespersons