Q_weak: First Direct Measurement of the Proton’s Weak Charge

Androić, Darko and Armstrong, D. S. and Asaturyan, A. and Averett, T. and Balewski, J. and Bartlett, K. and Beaufait, J. and Beminiwattha, R. S. and Benesch, J. and Benmokhtar, F. and Birchall, J. and Carlini, R. D. and Cates, G. D. and Cornejo, J. C. and Covrig, S. and Dalton, M. M. and Davis, C. A. and Deconinck, W. and Diefenbach, J. and Dowd, J. F. and Dunne, J. A. and Dutta, D. and Duvalla, W. S. and Elaasar, M. and Falk, W. R. and Finn, J. M. and Forest, T. and Gal, C. and Gaskell, D. and Gericke, M. T. W. and Grames, J. and Gray, V. M. and Grimm, K. and Guo, F. and Hoskins, J. R. and Johnston, K. and Jones, D. and Jones, M. and Jones, R. and Kargiantoulakis, M. and King, P. M. and Korkmaz, E. and Kowalski, S. and Leacock, J. and Leckey, J. and Lee, A. R. and Lee, J. H. and Lee, L. and MacEwan, S. and Mack, D. and Magee, J. A. and Mahurin, R. and Mammei, J. and Martin, J. W. and McHugh, M. J. and Meekins, D. and Mei, J. and Michaels, R. and Micherdzinska, A. and Mkrtchyan, A. and Mkrtchyan, H. and Morgan, N. and Myers, K. E. and Narayan, A. and Ndukum, L. Z. and Nelyubin, V. and Nuhait, H. and Nuruzzaman, W.T.H van Oers and Page, S. A. and Opper, A. K. and Pan, J. and Paschke, K. D. and Phillips, S. K. and Pitt, M. L. and Poelker, M. and Rajotte, J. F. and Ramsay, W. D. and Roche, J. and Sawatzky, B. and Ševa, Tomislav and Shabestari, M. H. and Silwal, R. and Šimičević, Neven and Smith, G. R. and Solvignon, P. and Spayde, D. T. and Subedi, A. and Subedi, R. and Suleiman, R. and Tadevosyan, V. and Tobias, W. A. and Tvaskis, V. and Waidyawansa, B. and Wang, P. and Wells, S. P. and Wood, S. A. and Yang, S. and Young, R. D. and Zang, P. and Zhamkochyan, S. (2017) Q_weak: First Direct Measurement of the Proton’s Weak Charge. European Physical Journal Web of Conferences, 137 (8). Art. No. 08005. ISSN 2100-014X

[img]
Preview
PDF - Published Version
Available under License Creative Commons Attribution.
Language: English

Download (1MB) | Preview

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 Q2 = 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.

Item Type: Article
Keywords: weak charge, proton, parity-violating asymmetry
Date: 22 March 2017
Subjects: NATURAL SCIENCES > Physics
Additional Information: © The Authors, published by EDP Sciences, 2017. This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Divisions: Faculty of Science > Department of Physics
Publisher: EDP Sciences
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 20 Apr 2017 15:04
Last Modified: 29 Nov 2017 17:22
URI: http://digre.pmf.unizg.hr/id/eprint/5486

Actions (login required)

View Item View Item