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Article ; Online: Determination of the ^{27}Al Neutron Distribution Radius from a Parity-Violating Electron Scattering Measurement.

Androić, D / Armstrong, D S / Bartlett, K / Beminiwattha, R S / Benesch, J / Benmokhtar, F / Birchall, J / Carlini, R D / Cornejo, J C / Covrig Dusa, S / Dalton, M M / Davis, C A / Deconinck, W / 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 / Gray, V M / Grimm, K / Guo, F / Hoskins, J R / Jones, D C / Jones, M K / 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 / Mesick, K E / Michaels, R / Micherdzinska, A / Mkrtchyan, A / Mkrtchyan, H / Narayan, A / Ndukum, L Z / Nelyubin, V / Nuruzzaman / van Oers, W T H / Owen, V F / Page, S A / Pan, J / Paschke, K D / Phillips, S K / Pitt, M L / Radloff, R W / 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 / Suleiman, R / Tadevosyan, V / Tobias, W A / Tvaskis, V / Waidyawansa, B / Wang, P / Wells, S P / Wood, S A / Yang, S / Zang, P / Zhamkochyan, S / Christy, M E / Horowitz, C J / Fattoyev, F J / Lin, Z

Physical review letters

2022 Volume 128, Issue 13, Page(s) 132501

Abstract: We report the first measurement of the parity-violating elastic electron scattering asymmetry on ^{27}Al. The ^{27}Al elastic asymmetry is A_{PV}=2.16±0.11(stat)±0.16(syst) ppm, and was measured at ⟨Q^{2}⟩=0.02357±0.00010 GeV^{2}, ⟨θ_{lab}⟩=7.61°±0.02°, ...

Abstract	We report the first measurement of the parity-violating elastic electron scattering asymmetry on ^{27}Al. The ^{27}Al elastic asymmetry is A_{PV}=2.16±0.11(stat)±0.16(syst) ppm, and was measured at ⟨Q^{2}⟩=0.02357±0.00010 GeV^{2}, ⟨θ_{lab}⟩=7.61°±0.02°, and ⟨E_{lab}⟩=1.157 GeV with the Q_{weak} apparatus at Jefferson Lab. Predictions using a simple Born approximation as well as more sophisticated distorted-wave calculations are in good agreement with this result. From this asymmetry the ^{27}Al neutron radius R_{n}=2.89±0.12 fm was determined using a many-models correlation technique. The corresponding neutron skin thickness R_{n}-R_{p}=-0.04±0.12 fm is small, as expected for a light nucleus with a neutron excess of only 1. This result thus serves as a successful benchmark for electroweak determinations of neutron radii on heavier nuclei. A tree-level approach was used to extract the ^{27}Al weak radius R_{w}=3.00±0.15 fm, and the weak skin thickness R_{wk}-R_{ch}=-0.04±0.15 fm. The weak form factor at this Q^{2} is F_{wk}=0.39±0.04.
Language	English
Publishing date	2022-04-15
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.128.132501
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Article ; Online: First Observation of P-odd γ Asymmetry in Polarized Neutron Capture on Hydrogen.

Blyth, D / Fry, J / Fomin, N / Alarcon, R / Alonzi, L / Askanazi, E / Baeßler, S / Balascuta, S / Barrón-Palos, L / Barzilov, A / Bowman, J D / Birge, N / Calarco, J R / Chupp, T E / Cianciolo, V / Coppola, C E / Crawford, C B / Craycraft, K / Evans, D /

Fieseler, C / Frlež, E / Garishvili, I / Gericke, M T W / Gillis, R C / Grammer, K B / Greene, G L / Hall, J / Hamblen, J / Hayes, C / Iverson, E B / Kabir, M L / Kucuker, S / Lauss, B / Mahurin, R / McCrea, M / Maldonado-Velázquez, M / Masuda, Y / Mei, J / Milburn, R / Mueller, P E / Musgrave, M / Nann, H / Novikov, I / Parsons, D / Penttilä, S I / Počanić, D / Ramirez-Morales, A / Root, M / Salas-Bacci, A / Santra, S / Schröder, S / Scott, E / Seo, P-N / Sharapov, E I / Simmons, F / Snow, W M / Sprow, A / Stewart, J / Tang, E / Tang, Z / Tong, X / Turkoglu, D J / Whitehead, R / Wilburn, W S

Physical review letters

2019 Volume 121, Issue 24, Page(s) 242002

Abstract: We report the first observation of the parity-violating gamma-ray asymmetry A_{γ}^{np} in neutron-proton capture using polarized cold neutrons incident on a liquid parahydrogen target at the Spallation Neutron Source at Oak Ridge National Laboratory. A_{ ... ...

Abstract	We report the first observation of the parity-violating gamma-ray asymmetry A_{γ}^{np} in neutron-proton capture using polarized cold neutrons incident on a liquid parahydrogen target at the Spallation Neutron Source at Oak Ridge National Laboratory. A_{γ}^{np} isolates the ΔI=1, ^{3}S_{1}→^{3}P_{1} component of the weak nucleon-nucleon interaction, which is dominated by pion exchange and can be directly related to a single coupling constant in either the DDH meson exchange model or pionless effective field theory. We measured A_{γ}^{np}=[-3.0±1.4(stat)±0.2(syst)]×10^{-8}, which implies a DDH weak πNN coupling of h_{π}^{1}=[2.6±1.2(stat)±0.2(syst)]×10^{-7} and a pionless EFT constant of C^{^{3}S_{1}→^{3}P_{1}}/C_{0}=[-7.4±3.5(stat)±0.5(syst)]×10^{-11} MeV^{-1}. We describe the experiment, data analysis, systematic uncertainties, and implications of the result.
Language	English
Publishing date	2019-01-04
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.121.242002
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Article ; Online: Precision Measurement of the Beam-Normal Single-Spin Asymmetry in Forward-Angle Elastic Electron-Proton Scattering.

Androić, D / Armstrong, D S / Asaturyan, A / Bartlett, K / Beaufait, J / Beminiwattha, R S / Benesch, J / Benmokhtar, F / Birchall, J / Carlini, R D / Cornejo, J C / Dusa, S Covrig / Dalton, M M / Davis, C A / Deconinck, W / 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 / Jones, D / Jones, M K / Jones, R T / Kargiantoulakis, M / King, P M / Korkmaz, E / Kowalski, S / Leacock, J / Leckey, J P / 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 / Mesick, K E / Michaels, R / Micherdzinska, A / Mkrtchyan, A / Mkrtchyan, H / Morgan, N / Narayan, A / Ndukum, L Z / Nelyubin, V / Nuruzzaman / van Oers, W T H / Owen, V F / Page, S A / Pan, J / Paschke, K D / Phillips, S K / Pitt, M L / Radloff, R W / 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 / Zang, P / Zhamkochyan, S

Physical review letters

2020 Volume 125, Issue 11, Page(s) 112502

Abstract: A beam-normal single-spin asymmetry generated in the scattering of transversely polarized electrons from unpolarized nucleons is an observable related to the imaginary part of the two-photon exchange process. We report a 2% precision measurement of the ... ...

Abstract	A beam-normal single-spin asymmetry generated in the scattering of transversely polarized electrons from unpolarized nucleons is an observable related to the imaginary part of the two-photon exchange process. We report a 2% precision measurement of the beam-normal single-spin asymmetry in elastic electron-proton scattering with a mean scattering angle of θ_{lab}=7.9° and a mean energy of 1.149 GeV. The asymmetry result is B_{n}=-5.194±0.067(stat)±0.082 (syst) ppm. This is the most precise measurement of this quantity available to date and therefore provides a stringent test of two-photon exchange models at far-forward scattering angles (θ_{lab}→0) where they should be most reliable.
Language	English
Publishing date	2020-09-24
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.125.112502
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Article ; Online: Recent results from the G0 experiment

Roos P. / Roche J. / Ramsay W.D. / Quinn B. / Poelker M. / Pitt M.L. / Pillot P. / Phillips S.K. / Pate S.F. / Papavassiliou V. / Page S.A. / van Oers W.T.H. / Muether M. / Mkrtchyan H. / Mihovilovic M. / Micherdzinska A. / McKeown R.D. / Martin J.W. / Mammei J. /

Lung A. / Liu J. / Lee L. / Kox S. / Korsch W. / King P.M. / Jones M. / Horn T. / Hansknecht J. / Guillard G. / Grames J. / Gericke M.T.W. / Gaskell D. / Furget C. / Franklin G. / Flores G. / Davis C.A. / Ellis C. / Coppens A. / Chao Y.-C. / Capuano C.L. / Breuer H. / Bosted P. / Birchall J. / Benmokhtar F. / Bimbot L. / Benesch J. / Beise E.J. / Beck D.H. / Bailey S.L. / Arvieux J. / Armstrong D.S. / Androić D. / Real J.S. / Schaub J. / Seva T. / Simicevic N. / Smith G.R. / Spayde D.T. / Stutzman M. / Suleiman R. / Tadevosyan V. / Versteegen M. / Voutier E. / Vulcan W. / Wells S.P. / Williamson S.E. / Wood S.A.

EPJ Web of Conferences, Vol 3, p

2010 Volume 03004

Abstract: We have measured parity violating asymmetries in elastic electron-proton and quasi-elastic electrondeuteron scattering at backward electron angle. These measurements have been done at two momentum transfers : Q2 = 0.22 and 0.63 (GeV/c)2 . Together with ... ...

Abstract	We have measured parity violating asymmetries in elastic electron-proton and quasi-elastic electrondeuteron scattering at backward electron angle. These measurements have been done at two momentum transfers : Q2 = 0.22 and 0.63 (GeV/c)2 . Together with our previous forward angle measurement [1], we can extract strange quark contributions to the electromagnetic form factors of the nucleon, as well as nucleon axial form factor coming from the neutral weak interaction. The results indicate a strange quark magnetic contribution close to zero at these Q2 , and a possible non zero strange quark electric contribution for the high Q2 . The ﬁrst Q2 behavior measurement of the nucleon axial form factor in elastic electron scattering shows a good agreement with radiative corrections calculated at Q2 = 0 and with a dipole form using the axial mass determined in neutrino scattering.
Keywords	Physics ; QC1-999 ; Science ; Q ; DOAJ:Physics (General) ; DOAJ:Physics and Astronomy
Subject code	530
Language	English
Publishing date	2010-04-01T00:00:00Z
Publisher	EDP Sciences
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Measurement of the parity-violating asymmetry in inclusive electroproduction of π- near the Δ0 resonance.

Androić, D / Armstrong, D S / Arvieux, J / Bailey, S L / Beck, D H / Beise, E J / Benesch, J / Benmokhtar, F / Bimbot, L / Birchall, J / Bosted, P / Breuer, H / Capuano, C L / Chao, Y-C / Coppens, A / Davis, C A / Ellis, C / Flores, G / Franklin, G /

Furget, C / Gaskell, D / Gericke, M T W / Grames, J / Guillard, G / Hansknecht, J / Horn, T / Jones, M K / King, P M / Korsch, W / Kox, S / Lee, L / Liu, J / Lung, A / Mammei, J / Martin, J W / McKeown, R D / Micherdzinska, A / Mihovilovic, M / Mkrtchyan, H / Muether, M / Page, S A / Papavassiliou, V / Pate, S F / Phillips, S K / Pillot, P / Pitt, M L / Poelker, M / Quinn, B / Ramsay, W D / Real, J-S / Roche, J / Roos, P / Schaub, J / Seva, T / Simicevic, N / Smith, G R / Spayde, D T / Stutzman, M / Suleiman, R / Tadevosyan, V / van Oers, W T H / Versteegen, M / Voutier, E / Vulcan, W / Wells, S P / Williamson, S E / Wood, S A

Physical review letters

2012 Volume 108, Issue 12, Page(s) 122002

Abstract: The parity-violating (PV) asymmetry of inclusive π- production in electron scattering from a liquid deuterium target was measured at backward angles. The measurement was conducted as a part of the G0 experiment, at a beam energy of 360 MeV. The physics ... ...

Abstract	The parity-violating (PV) asymmetry of inclusive π- production in electron scattering from a liquid deuterium target was measured at backward angles. The measurement was conducted as a part of the G0 experiment, at a beam energy of 360 MeV. The physics process dominating pion production for these kinematics is quasifree photoproduction off the neutron via the Δ0 resonance. In the context of heavy-baryon chiral perturbation theory, this asymmetry is related to a low-energy constant d(Δ)- that characterizes the parity-violating γNΔ coupling. Zhu et al. calculated d(Δ)- in a model benchmarked by the large asymmetries seen in hyperon weak radiative decays, and predicted potentially large asymmetries for this process, ranging from A(γ)-=-5.2 to +5.2 ppm. The measurement performed in this work leads to A(γ)-=-0.36±1.06±0.37±0.03 ppm (where sources of statistical, systematic and theoretical uncertainties are included), which would disfavor enchancements considered by Zhu et al. proportional to V(ud)/V(us). The measurement is part of a program of inelastic scattering measurements that were conducted by the G0 experiment, seeking to determine the N-Δ axial transition form factors using PV electron scattering.
Language	English
Publishing date	2012-03-23
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.108.122002
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Article ; Online: Transverse beam spin asymmetries at backward angles in elastic electron-proton and quasielastic electron-deuteron scattering.

Physical review letters

2011 Volume 107, Issue 2, Page(s) 22501

Abstract: We have measured the beam-normal single-spin asymmetries in elastic scattering of transversely polarized electrons from the proton, and performed the first measurement in quasielastic scattering on the deuteron, at backward angles (lab scattering angle ... ...

Abstract	We have measured the beam-normal single-spin asymmetries in elastic scattering of transversely polarized electrons from the proton, and performed the first measurement in quasielastic scattering on the deuteron, at backward angles (lab scattering angle of 108°) for Q² = 0.22 GeV²/c² and 0.63 GeV²/c² at beam energies of 362 and 687 MeV, respectively. The asymmetry arises due to the imaginary part of the interference of the two-photon exchange amplitude with that of single-photon exchange. Results for the proton are consistent with a model calculation which includes inelastic intermediate hadronic (πN) states. An estimate of the beam-normal single-spin asymmetry for the scattering from the neutron is made using a quasistatic deuterium approximation, and is also in agreement with theory.
Language	English
Publishing date	2011-07-08
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.107.022501
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Early Results from the Qweak Experiment

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. / 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. / 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. / Nuruzzaman / van Oers W.T.H / 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.

EPJ Web of Conferences, Vol 66, p

2014 Volume 05002

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 e→p$\vec e{\rm{p}}$ scattering to ... ...

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 e→p$\vec e{\rm{p}}$ scattering to provide the first determination of the proton’s weak charge Qwp$Q_w^p$. The experiment employed a 180 μA longitudinally polarized 1.16 GeV electron beam on a 35 cm long liquid hydrogen target. Scattered electrons in the angular range 6° < θ < 12° corresponding to Q2 = 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 e→p$\vec e{\rm{p}}$ to 4.2% (combined statisstatistical and systematic error), which implies a measure of sin2(θw) at the level of 0.3%, 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 world’s highest power LH2 target. The new constraints on C1u and C1d provided by the subset of the experiment’s data analyzed to date will also be shown, together with the extracted weak charge of the neutron.
Keywords	Physics ; QC1-999 ; Science ; Q
Subject code	541
Language	English
Publishing date	2014-03-01T00:00:00Z
Publisher	EDP Sciences
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: First determination of the weak charge of the proton.

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 / 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 / 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 / Zhamkochyan, S

Physical review letters

2013 Volume 111, Issue 14, Page(s) 141803

Abstract: The Q(weak) experiment has measured the parity-violating asymmetry in ep elastic scattering at Q(2)=0.025(GeV/c)(2), employing 145 μA of 89% longitudinally polarized electrons on a 34.4 cm long liquid hydrogen target at Jefferson Lab. The results of the ... ...

Abstract	The Q(weak) experiment has measured the parity-violating asymmetry in ep elastic scattering at Q(2)=0.025(GeV/c)(2), employing 145 μA of 89% longitudinally polarized electrons on a 34.4 cm long liquid hydrogen target at Jefferson Lab. The results of the experiment's commissioning run, constituting approximately 4% of the data collected in the experiment, are reported here. From these initial results, the measured asymmetry is A(ep)=-279±35 (stat) ± 31 (syst) ppb, which is the smallest and most precise asymmetry ever measured in ep scattering. The small Q(2) of this experiment has made possible the first determination of the weak charge of the proton Q(W)(p) by incorporating earlier parity-violating electron scattering (PVES) data at higher Q(2) to constrain hadronic corrections. The value of Q(W)(p) obtained in this way is Q(W)(p)(PVES)=0.064±0.012, which is in good agreement with the standard model prediction of Q(W)(p)(SM)=0.0710±0.0007. When this result is further combined with the Cs atomic parity violation (APV) measurement, significant constraints on the weak charges of the up and down quarks can also be extracted. That PVES+APV analysis reveals the neutron's weak charge to be Q(W)(n)(PVES+APV)=-0.975±0.010.
Language	English
Publishing date	2013-10-04
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.111.141803
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Article ; Online: Strange quark contributions to parity-violating asymmetries in the backward angle G0 electron scattering experiment.

Furget, C / Gaskell, D / Gericke, M T W / Grames, J / Guillard, G / Hansknecht, J / Horn, T / Jones, M / King, P M / Korsch, W / Kox, S / Lee, L / Liu, J / Lung, A / Mammei, J / Martin, J W / McKeown, R D / Mihovilovic, M / Micherdzinska, A / Mkrtchyan, H / Muether, M / Page, S A / Papavassiliou, V / Pate, S F / Phillips, S K / Pillot, P / Pitt, M L / Poelker, M / Quinn, B / Ramsay, W D / Real, J-S / Roche, J / Roos, P / Schaub, J / Seva, T / Simicevic, N / Smith, G R / Spayde, D T / Stutzman, M / Suleiman, R / Tadevosyan, V / van Oers, W T H / Versteegen, M / Voutier, E / Vulcan, W / Wells, S P / Williamson, S E / Wood, S A

Physical review letters

2010 Volume 104, Issue 1, Page(s) 12001

Abstract: We have measured parity-violating asymmetries in elastic electron-proton and quasielastic electron-deuteron scattering at Q2=0.22 and 0.63 GeV2. They are sensitive to strange quark contributions to currents in the nucleon and the nucleon axial-vector ... ...

Abstract	We have measured parity-violating asymmetries in elastic electron-proton and quasielastic electron-deuteron scattering at Q2=0.22 and 0.63 GeV2. They are sensitive to strange quark contributions to currents in the nucleon and the nucleon axial-vector current. The results indicate strange quark contributions of approximately < 10% of the charge and magnetic nucleon form factors at these four-momentum transfers. We also present the first measurement of anapole moment effects in the axial-vector current at these four-momentum transfers.
Language	English
Publishing date	2010-01-08
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.104.012001
Database	MEDical Literature Analysis and Retrieval System OnLINE

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