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Title: Q weak: First direct measurement of the proton’s weak charge

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. Finally, 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.
Authors:
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Publication Date:
Report Number(s):
JLAB-PHY-16-2377; DOE/OR/23177-4110
Journal ID: ISSN 2100-014X; PII: epjconf_conf2017_08005; TRN: US1700590
Grant/Contract Number:
AC05-06OR23177
Type:
Accepted Manuscript
Journal Name:
EPJ Web of Conferences
Additional Journal Information:
Journal Volume: 137; Conference: Confinement XII, Thessaloniki (Greece), 28 Aug - 4 Sep 2016; Journal ID: ISSN 2100-014X
Publisher:
EDP Sciences
Research Org:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Contributing Orgs:
Jefferson Lab Qweak Collaboration
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
OSTI Identifier:
1350092

Androic, D., Armstrong, D. S., Asaturyan, A., Averett, T., Balewski, J., Bartlett, K., Beaufait, J., Beminiwattha, R. S., Benesch, J., Benmokhtar, F., Birchall, J., Carlini, R. D., Cates, G. D., Cornejo, J. C., Covrig, S., Dalton, M. M., Davis, C. A., Deconinck, W., Diefenbach, J., Dowd, J. F., Dunne, J. A., Dutta, D., Duvall, W. S., Elaasar, M., Falk, W. R., Finn, J. M., Forest, T., Gal, C., Gaskell, D., Gericke, M. T. W., Grames, J., Gray, V. M., Grimm, K., Guo, F., Hoskins, J. R., Johnston, K., Jones, D., Jones, M., Jones, R., Kargiantoulakis, M., King, P. M., Korkmaz, E., Kowalski, S., Leacock, J., Leckey, J., Lee, A. R., Lee, J. H., Lee, L., MacEwan, S., Mack, D., Magee, J. A., Mahurin, R., Mammei, J., Martin, J. W., McHugh, M. J., Meekins, D., Mei, J., Michaels, R., Micherdzinska, A., Mkrtchyan, A., Mkrtchyan, H., Morgan, N., Myers, K. E., Narayan, A., Ndukum, L. Z., Nelyubin, V., Nuhait, H., Nuruzzaman,, van Oers, W. T. H., Opper, A. K., Page, S. A., Pan, J., Paschke, K. D., Phillips, S. K., Pitt, M. L., Poelker, M., Rajotte, J. F., Ramsay, W. D., Roche, J., Sawatzky, B., Seva, T., Shabestari, M. H., Silwal, R., Simicevic, N., Smith, G. R., Solvignon, P., Spayde, D. T., Subedi, A., Subedi, R., Suleiman, R., Tadevosyan, V., Tobias, W. A., Tvaskis, V., Waidyawansa, B., Wang, P., Wells, S. P., Wood, S. A., Yang, S., Young, R. D., Zang, P., Zhamkochyan, S., Foka, Y., Brambilla, N., and Kovalenko, V.. Q weak: First direct measurement of the proton’s weak charge. United States: N. p., Web. doi:10.1051/epjconf/201713708005.
Androic, D., Armstrong, D. S., Asaturyan, A., Averett, T., Balewski, J., Bartlett, K., Beaufait, J., Beminiwattha, R. S., Benesch, J., Benmokhtar, F., Birchall, J., Carlini, R. D., Cates, G. D., Cornejo, J. C., Covrig, S., Dalton, M. M., Davis, C. A., Deconinck, W., Diefenbach, J., Dowd, J. F., Dunne, J. A., Dutta, D., Duvall, W. S., Elaasar, M., Falk, W. R., Finn, J. M., Forest, T., Gal, C., Gaskell, D., Gericke, M. T. W., Grames, J., Gray, V. M., Grimm, K., Guo, F., Hoskins, J. R., Johnston, K., Jones, D., Jones, M., Jones, R., Kargiantoulakis, M., King, P. M., Korkmaz, E., Kowalski, S., Leacock, J., Leckey, J., Lee, A. R., Lee, J. H., Lee, L., MacEwan, S., Mack, D., Magee, J. A., Mahurin, R., Mammei, J., Martin, J. W., McHugh, M. J., Meekins, D., Mei, J., Michaels, R., Micherdzinska, A., Mkrtchyan, A., Mkrtchyan, H., Morgan, N., Myers, K. E., Narayan, A., Ndukum, L. Z., Nelyubin, V., Nuhait, H., Nuruzzaman,, van Oers, W. T. H., Opper, A. K., Page, S. A., Pan, J., Paschke, K. D., Phillips, S. K., Pitt, M. L., Poelker, M., Rajotte, J. F., Ramsay, W. D., Roche, J., Sawatzky, B., Seva, T., Shabestari, M. H., Silwal, R., Simicevic, N., Smith, G. R., Solvignon, P., Spayde, D. T., Subedi, A., Subedi, R., Suleiman, R., Tadevosyan, V., Tobias, W. A., Tvaskis, V., Waidyawansa, B., Wang, P., Wells, S. P., Wood, S. A., Yang, S., Young, R. D., Zang, P., Zhamkochyan, S., Foka, Y., Brambilla, N., & Kovalenko, V.. Q weak: First direct measurement of the proton’s weak charge. United States. doi:10.1051/epjconf/201713708005.
Androic, D., Armstrong, D. S., Asaturyan, A., Averett, T., Balewski, J., Bartlett, K., Beaufait, J., Beminiwattha, R. S., Benesch, J., Benmokhtar, F., Birchall, J., Carlini, R. D., Cates, G. D., Cornejo, J. C., Covrig, S., Dalton, M. M., Davis, C. A., Deconinck, W., Diefenbach, J., Dowd, J. F., Dunne, J. A., Dutta, D., Duvall, W. S., Elaasar, M., Falk, W. R., Finn, J. M., Forest, T., Gal, C., Gaskell, D., Gericke, M. T. W., Grames, J., Gray, V. M., Grimm, K., Guo, F., Hoskins, J. R., Johnston, K., Jones, D., Jones, M., Jones, R., Kargiantoulakis, M., King, P. M., Korkmaz, E., Kowalski, S., Leacock, J., Leckey, J., Lee, A. R., Lee, J. H., Lee, L., MacEwan, S., Mack, D., Magee, J. A., Mahurin, R., Mammei, J., Martin, J. W., McHugh, M. J., Meekins, D., Mei, J., Michaels, R., Micherdzinska, A., Mkrtchyan, A., Mkrtchyan, H., Morgan, N., Myers, K. E., Narayan, A., Ndukum, L. Z., Nelyubin, V., Nuhait, H., Nuruzzaman,, van Oers, W. T. H., Opper, A. K., Page, S. A., Pan, J., Paschke, K. D., Phillips, S. K., Pitt, M. L., Poelker, M., Rajotte, J. F., Ramsay, W. D., Roche, J., Sawatzky, B., Seva, T., Shabestari, M. H., Silwal, R., Simicevic, N., Smith, G. R., Solvignon, P., Spayde, D. T., Subedi, A., Subedi, R., Suleiman, R., Tadevosyan, V., Tobias, W. A., Tvaskis, V., Waidyawansa, B., Wang, P., Wells, S. P., Wood, S. A., Yang, S., Young, R. D., Zang, P., Zhamkochyan, S., Foka, Y., Brambilla, N., and Kovalenko, V.. 2017. "Q weak: First direct measurement of the proton’s weak charge". United States. doi:10.1051/epjconf/201713708005. https://www.osti.gov/servlets/purl/1350092.
@article{osti_1350092,
title = {Q weak: First direct measurement of the proton’s weak charge},
author = {Androic, D. 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 Duvall, 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, and van Oers, W. T. H. and Opper, A. K. and Page, S. A. 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 Seva, T. and Shabestari, M. H. and Silwal, R. and Simicevic, N. 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. and Foka, Y. and Brambilla, N. and Kovalenko, V.},
abstractNote = {The Qweak 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. Finally, 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.},
doi = {10.1051/epjconf/201713708005},
journal = {EPJ Web of Conferences},
number = ,
volume = 137,
place = {United States},
year = {2017},
month = {3}
}