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1. Qweak: First Direct Measurement of the Proton’s Weak Charge

Author

J. R. Hoskins, V. Tadevosyan, J. Diefenbach, K. Johnston, J. Birchall, S.A. Page, D. S. Armstrong, M. J. McHugh, J. Mei, H. Nuhait, C. A. Davis, M. Elaasar, Juliette Mammei, T. Averett, Wouter Deconinck, J. A. Magee, P. Wang, S. Yang, G.R. Smith, W. R. Falk, P. Zang, H. Mkrtchyan, W. T. H. van Oers, D. G. Meekins, J. Pan, F. Guo, J. Roche, Vladimir Nelyubin, W.D. Ramsay, J. Beaufait, B. Sawatzky, Fatiha Benmokhtar, M.L. Pitt, D. C. Jones, N. Morgan, R. Suleiman, N. Simicevic, V. Tvaskis, R. Michaels, Michael Gericke, B. Waidyawansa, Roger Carlini, J. Leckey, T. A. Forest, R. T. Jones, Jay Benesch, J. M. Finn, J. Balewski, M. M. Dalton, J. Grames, L. Lee, Jean-Francois Rajotte, Dipangkar Dutta, S. Kowalski, L. Z. Ndukum, W. S. Duvall, D. J. Mack, J. W. Martin, A.K. Opper, M. Kargiantoulakis, S.A. Wood, T. Seva, P. Solvignon, G. D. Cates, V. M. Gray, Jongmin Lee, K. Grimm, S. Covrig, A. R. Lee, J. Leacock, R. Mahurin, D.T. Spayde, R. Silwal, A. Mkrtchyan, S.K. Phillips, A. Asaturyan, S. Zhamkochyan, S. MacEwan, E. Korkmaz, J.C. Cornejo, K. E. Myers, P. M. King, K. Bartlett, Darko Androić, A. Subedi, J. A. Dunne, Amrendra Narayan, R. Subedi, D. Gaskell, K.D. Paschke, A. Micherdzinska, M.H. Shabestari, M. K. Jones, W.A. Tobias, C. Gal, R. S. Beminiwattha, M. Poelker, Ross D. Young, J. F. Dowd, and S.P. Wells

Subjects
Physics, Particle physics, Proton, 010308 nuclear & particles physics, QC1-999, media_common.quotation_subject, Hadron, Charge (physics), Elementary particle, 7. Clean energy, 01 natural sciences, Asymmetry, Standard Model, Nuclear physics, 0103 physical sciences, Physics::Accelerator Physics, Grand Unified Theory, Nuclear Experiment, 010306 general physics, Nucleon, media_common
Abstract

The Q weak experiment, which took data at Jefferson Lab in the period 2010 - 2012, will precisely determine the weak charge of the proton by measuring the parity-violating asymmetry in elastic e-p scattering at 1.1 GeV using a longitudinally polarized electron beam and a liquid hydrogen target at a low momentum transfer of Q 2 = 0.025 (GeV/c)2 . The weak charge of the proton is predicted by the Standard Model and any significant deviation would indicate physics beyond the Standard Model. The technical challenges and experimental apparatus for measuring the weak charge of the proton will be discussed, as well as the method of extracting the weak charge of the proton. The results from a small subset of the data, that has been published, will also be presented. Furthermore an update will be given of the current status of the data analysis.

Published
2017
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2. Early Results from the Qweak Experiment

Author

J. Beaufait, H. Mkrtchyan, J. Roche, J. A. Dunne, Jean-Francois Rajotte, Kathryn Grimm, S. K. Phillips, J. Diefenbach, S. Covrig, S. MacEwan, T. Seva, E. Korkmaz, D. G. Meekins, Matthew Jones, M. M. Dalton, T. Averett, D. C. Jones, Kent Paschke, R. W. L. Jones, Fatiha Benmokhtar, J. A. Magee, R. Michaels, P. M. King, W. D. Ramsay, R. S. Beminiwattha, M. H. Shabestari, Wouter Deconinck, V. Tadevosyan, A. Asaturyan, R. D. Carlini, S. Kowalski, W. S. Duvall, Jay Benesch, F. Guo, J. Birchall, A. Micherdzinska, Joseph Grames, Ross D. Young, J. W. Martin, B. Waidyawansa, J. F. Dowd, Michael Pitt, S. Yang, Geoffrey Smith, S. A. Page, V. M. Gray, M. Poelker, Nuruzzaman, R. Silwal, G. D. Cates, P. Wang, S. P. Wells, T. A. Forest, Jongmin Lee, Dipangkar Dutta, K. Johnston, A. R. Lee, J. Leacock, B. Sawatzky, M. Elaasar, J. Mei, D. S. Armstrong, Riad Suleiman, A. Subedi, S. A. Wood, R. Mahurin, Amrendra Narayan, L. Lee, J. Balewski, P. Solvignon, D. J. Mack, R. Subedi, John M. Finn, W. R. Falk, M. Kargiantoulakis, N. Morgan, L. Z. Ndukum, Vladimir Nelyubin, M. J. McHugh, Neven Simicevic, W. T. H. van Oers, C. A. Davis, William A. Tobias, D. Gaskel, Michael Gericke, J. C. Cornejo, J. R. Hoskins, J. Pan, Darko Androić, Juliette Mammei, S. Zhamkochyan, J. Leckey, D. T. Spayde, A. K. Opper, K. E. Myers, V. Tvaskis, and A. Mkrtchyan

Subjects
Physics, Quark, Scattering, media_common.quotation_subject, Physics beyond the Standard Model, QC1-999, FOS: Physical sciences, Electron, Measure (mathematics), Asymmetry, Nuclear physics, Neutron, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), Nuclear Experiment, Beam (structure), media_common
Abstract

A subset of results from the recently completed Jefferson Lab Qweak experiment are reported. This experiment, sensitive to physics beyond the Standard Model, exploits the small parity-violating asymmetry in elastic ep scattering to provide the first determination of the protons weak charge Qweak(p). The experiment employed a 180 uA longitudinally polarized 1.16 GeV electron beam on a 35 cm long liquid hydrogen target. Scattered electrons corresponding to Q2 of 0.025 GeV2 were detected in eight Cerenkov detectors arrayed symmetrically around the beam axis. The goals of the experiment were to provide a measure of Qweak(p) to 4.2 percent (combined statistical and systematic error), which implies a measure of sin2(thetaw) at the level of 0.3 percent, and to help constrain the vector weak quark charges C1u and C1d. The experimental method is described, with particular focus on the challenges associated with the worlds highest power LH2 target. The new constraints on C1u and C1d provided by the subset of the experiments data analyzed to date will also be shown, together with the extracted weak charge of the neutron., Comment: 8 pages, 4 figures, INPC2013

Published
2014

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