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Title: Early Results from the Q{sub weak} Experiment

Abstract

A subset of results from the recently completed Jefferson Lab Q{sub weak} experiment are reported. This experiment, sensitive to physics beyond the Standard Model, exploits the small parity-violating asymmetry in elastic {vector e}p scattering to provide the first determination of the protons weak charge Q{sub w}{sup p}. The experiment employed a 180 {micro}A longitudinally polarized 1.16 GeV electron beam on a 35 cm long liquid hydrogen target. Scattered electrons corresponding to Q{sup 2} of 0.025 GeV{sup 2} were detected in eight Cerenkov detectors arrayed symmetrically around the beam axis. The goals of the experiment were to provide a measure of Q{sub w}{sup 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 C{sub 1u} and C{sub 1d}. The experimental method is described, with particular focus on the challenges associated with the worlds highest power LH{sub 2} target. The new constraints on C{sub 1u} and C{sub 1d} provided by the subset of the experiments data analyzed to date will also be shown, together with the extracted weak charge of the neutron.

Authors:
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Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1129552
Report Number(s):
JLAB-PHY-13-1711; DOE/OR/23177-2724; arXiv:1311.6437
DOE Contract Number:  
AC05-06OR23177
Resource Type:
Conference
Journal Name:
EPJ Web of Conferences
Additional Journal Information:
Journal Volume: 66; Conference: INPC 2013, Firenze, Italy, 2-7 June 2013
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Androic, D, Armstrong, D S, Asaturyan, A, Averett, T, Balewski, J, 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, Gaskel, 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, 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, W T H, Nuruzzaman, Oers, van, Opper, A K, Page, S A, Pan, J, Paschke, K, 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, and Zhamkochyan, S. Early Results from the Q{sub weak} Experiment. United States: N. p., 2014. Web. doi:10.1051/epjconf/20146605002.
Androic, D, Armstrong, D S, Asaturyan, A, Averett, T, Balewski, J, 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, Gaskel, 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, 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, W T H, Nuruzzaman, Oers, van, Opper, A K, Page, S A, Pan, J, Paschke, K, 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, & Zhamkochyan, S. Early Results from the Q{sub weak} Experiment. United States. https://doi.org/10.1051/epjconf/20146605002
Androic, D, Armstrong, D S, Asaturyan, A, Averett, T, Balewski, J, 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, Gaskel, 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, 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, W T H, Nuruzzaman, Oers, van, Opper, A K, Page, S A, Pan, J, Paschke, K, 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, and Zhamkochyan, S. 2014. "Early Results from the Q{sub weak} Experiment". United States. https://doi.org/10.1051/epjconf/20146605002. https://www.osti.gov/servlets/purl/1129552.
@article{osti_1129552,
title = {Early Results from the Q{sub weak} Experiment},
author = {Androic, D and Armstrong, D S and Asaturyan, A and Averett, T and Balewski, J 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 Gaskel, 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 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 W T H, Nuruzzaman and Oers, van and Opper, A K and Page, S A and Pan, J and Paschke, K 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 Zhamkochyan, S},
abstractNote = {A subset of results from the recently completed Jefferson Lab Q{sub weak} experiment are reported. This experiment, sensitive to physics beyond the Standard Model, exploits the small parity-violating asymmetry in elastic {vector e}p scattering to provide the first determination of the protons weak charge Q{sub w}{sup p}. The experiment employed a 180 {micro}A longitudinally polarized 1.16 GeV electron beam on a 35 cm long liquid hydrogen target. Scattered electrons corresponding to Q{sup 2} of 0.025 GeV{sup 2} were detected in eight Cerenkov detectors arrayed symmetrically around the beam axis. The goals of the experiment were to provide a measure of Q{sub w}{sup 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 C{sub 1u} and C{sub 1d}. The experimental method is described, with particular focus on the challenges associated with the worlds highest power LH{sub 2} target. The new constraints on C{sub 1u} and C{sub 1d} provided by the subset of the experiments data analyzed to date will also be shown, together with the extracted weak charge of the neutron.},
doi = {10.1051/epjconf/20146605002},
url = {https://www.osti.gov/biblio/1129552}, journal = {EPJ Web of Conferences},
number = ,
volume = 66,
place = {United States},
year = {Sat Mar 01 00:00:00 EST 2014},
month = {Sat Mar 01 00:00:00 EST 2014}
}

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