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1. Measurement of the Parity-Violating Asymmetry in Inclusive Electroproduction ofπ−near theΔ0Resonance

Author

V. Tadevosyan, M. Stutzman, M. K. Jones, R. Suleiman, J. Hansknecht, G. Guillard, Fatiha Benmokhtar, Darko Androić, S. Kox, W. D. Ramsay, Michael Pitt, W. T. H. van Oers, J. Roche, T. Horn, A. Micherdzinska, S. L. Bailey, E. Voutier, D. T. Spayde, H. Breuer, P. Bosted, Douglas H Beck, G. Flores, Christophe Furget, Michael Gericke, S. Wells, R. D. McKeown, Neven Simicevic, M. Muether, M. Poelker, E. J. Beise, Y. C. Chao, D. Gaskell, A. Coppens, M. Versteegen, J. Grames, B. P. Quinn, D. S. Armstrong, G. R. Smith, M. Mihovilovic, Junyu Liu, C. L. Capuano, L. Bimbot, S. E. Williamson, J. Birchall, S. K. Phillips, Wolfgang Korsch, Juliette Mammei, S. A. Wood, P. M. King, J. Arvieux, S. F. Pate, H. Mkrtchyan, C. Ellis, S. A. Page, P. G. Roos, P. Pillot, G. B. Franklin, W. F. Vulcan, T. Seva, J. Schaub, L. Lee, V. Papavassiliou, J. W. Martin, Jay Benesch, J. S. Real, C. A. Davis, and A. Lung

Subjects
Physics, Particle physics, Chiral perturbation theory, 010308 nuclear & particles physics, Scattering, media_common.quotation_subject, Hyperon, General Physics and Astronomy, Inelastic scattering, 01 natural sciences, Asymmetry, Nuclear physics, Pion, 0103 physical sciences, High Energy Physics::Experiment, Neutron, Nuclear Experiment, 010306 general physics, Electron scattering, media_common
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 Δ^0 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.

Published
2012
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2. Measurement of the Parity-Violating Asymmetry in Inclusive Electroproduction of π- near the Δ0 Resonance

Author

D, Androić, D S, Armstrong, J, Arvieux, S L, Bailey, D H, Beck, E J, Beise, J, Benesch, F, Benmokhtar, L, Bimbot, J, Birchall, P, Bosted, H, Breuer, C L, Capuano, Y-C, Chao, A, Coppens, C A, Davis, C, Ellis, G, Flores, G, Franklin, C, Furget, D, Gaskell, M T W, Gericke, J, Grames, G, Guillard, J, Hansknecht, T, Horn, M K, Jones, P M, King, W, Korsch, S, Kox, L, Lee, J, Liu, A, Lung, J, Mammei, J W, Martin, R D, McKeown, A, Micherdzinska, M, Mihovilovic, H, Mkrtchyan, M, Muether, S A, Page, V, Papavassiliou, S F, Pate, S K, Phillips, P, Pillot, M L, Pitt, M, Poelker, B, Quinn, W D, Ramsay, J-S, Real, J, Roche, P, Roos, J, Schaub, T, Seva, N, Simicevic, G R, Smith, D T, Spayde, M, Stutzman, R, Suleiman, V, Tadevosyan, W T H, van Oers, M, Versteegen, E, Voutier, W, Vulcan, S P, Wells, S E, Williamson, and S A, Wood

Subjects
PRIRODNE ZNANOSTI. Fizika, deuterium target, electron scattering, parity-violating asymmetry, High Energy Physics::Experiment, Nuclear Experiment, NATURAL SCIENCES. 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.

Published
2012
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3. Transverse Beam Spin Asymmetries at Backward Angles in Elastic Electron-Proton and Quasielastic Electron-Deuteron Scattering

Author

Marc Vanderhaeghen, J. Roche, M. K. Jones, Jay Benesch, J. Hansknecht, A. Lung, J. W. Martin, H. Breuer, W. F. Vulcan, Christophe Furget, S. F. Pate, H. Mkrtchyan, G. Flores, Michael Gericke, R. Suleiman, Darko Androić, S. Kox, G. Guillard, T. Seva, M. Stutzman, S. A. Page, J. Schaub, L. Lee, Douglas H Beck, Fatiha Benmokhtar, M. Muether, V. Papavassiliou, S. Wells, C. L. Capuano, T. Horn, R. D. McKeown, W. D. Ramsay, W. T. H. van Oers, P. Bosted, S. A. Wood, E. Voutier, D. T. Spayde, J. S. Real, M. Poelker, G. B. Franklin, C. A. Davis, D. Gaskell, B. Pasquini, P. M. King, B. P. Quinn, L. Bimbot, S. E. Williamson, Neven Simicevic, Y. C. Chao, Wolfgang Korsch, J. Birchall, Juliette Mammei, P. G. Roos, J. Grames, C. Ellis, M. Versteegen, S. K. Phillips, J. Arvieux, A. Micherdzinska, D. S. Armstrong, G. R. Smith, M. Mihovilovič, E. J. Beise, V. Tadevosyan, A. Coppens, Michael Pitt, S. L. Bailey, Junyu Liu, P. Pillot, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), and G0

Subjects
Nuclear Theory, General Physics and Astronomy, axial-vector current, FOS: Physical sciences, Inelastic scattering, Mott scattering, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], strange quark, 01 natural sciences, Nuclear physics, Nuclear Theory (nucl-th), High Energy Physics - Phenomenology (hep-ph), parity-violating asymmetries, charge and magnetic nucleon form factors, 0103 physical sciences, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Elastic scattering, Physics, Quasielastic scattering, 010308 nuclear & particles physics, Scattering, Small-angle neutron scattering, NATURAL SCIENCES. Physics, PRIRODNE ZNANOSTI. Fizika, High Energy Physics - Phenomenology, Quasielastic neutron scattering, Physics::Accelerator Physics, High Energy Physics::Experiment, Scattering theory, Atomic physics
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 quasi-elastic scattering on the deuteron, at backward angles (lab scattering angle of 108 degrees) for Q2 = 0.22 GeV^2/c^2 and 0.63 GeV^2/c^2 at beam energies of 362 MeV 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 (piN) states. An estimate of the beam-normal single-spin asymmetry for the scattering from the neutron is made using a quasi-static deuterium approximation, and is also in agreement with theory.

Published
2011
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4. The G0 Experiment: Apparatus for Parity-Violating Electron Scattering Measurements at Forward and Backward Angles

Author

T. Horn, G. A. Rutledge, R. M. Laszewski, A. Kolarkar, R. Hasty, F. Merchez, E. Liatard, K. Grimm, W. F. Vulcan, J. Yun, H. C. Fenker, R. Carr, R. Suleiman, D. McKee, J. Roche, R. Neveling, K. Johnston, M. Versteegen, Raphael Noel Tieulent, A. Coppens, R. Frascaria, S. A. Wood, T. Averett, P. Pillot, S. Kox, D. Marchand, D. S. Armstrong, K. A. Griffioen, G. R. Smith, C. Yan, G. Guillard, J. Lachniet, E. Voutier, K. W. McFarlane, G. Quéméner, J. Schaub, L. Lee, D. S. Dale, Michael Gericke, A. Hawthorne Allen, Fatiha Benmokhtar, V. Zeps, E. J. Beise, M. Muether, R. Clark, D. J. Mack, Michael Pitt, Jay Benesch, Jonathan W. Martin, W. T. H. van Oers, T. A. Porcelli, J. A. Secrest, W. D. Ramsay, A. A. Cowley, S. Niccolai, H. Guler, C. L. Capuano, S. L. Bailey, J. Arvieux, N. S. Chant, L. Bimbot, P. Kammel, C. Ellis, Bryan J. Moffit, R. Asaturyan, G. Batigne, D. T. Spayde, W. R. Falk, P. M. King, Douglas H Beck, A. Micherdzinska, Takeyasu Ito, John Musson, R. D. McKeown, S. A. Page, S. Wells, J. Kuhn, Y. C. Chao, K. Nakahara, B. Guillon, S. E. Williamson, J. Grames, L. Hannelius, M. Morlet, H. Breuer, J. Van de Wiele, S. K. Phillips, J. Hansknecht, J. S. Real, A. S. Biselli, R. J. Woo, S. Covrig, M. K. Jones, J. Lenoble, S. Ong, H. Mkrtchyan, M. Poelker, D. Gaskell, S.G. Stepanyan, T. A. Forest, C. A. Davis, A. Lung, J. M. Finn, M. Stutzman, S. F. Pate, T. Seva, E. Korkmaz, A. W. Rauf, V. Papavassiliou, P. Brindza, G. A. MacLachlan, V. Tadevosyan, J. Birchall, R. Kazimi, C. Furget, Juliette Mammei, Glen A. Warren, Neven Simicevic, P. G. Roos, D. Nilsson, G. B. Franklin, K. Gustafsson, Wolfgang Korsch, Darko Androić, M. Mihovilovic, Jin Liu, P. Bosted, R. D. Carlini, T. Ries, B. P. Quinn, Mines Nantes (Mines Nantes), Laboratoire SUBATECH Nantes (SUBATECH), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Nantes (UN)-Mines Nantes (Mines Nantes), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), and G0

Subjects
Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Physics::Instrumentation and Detectors, FOS: Physical sciences, Electron, Mott scattering, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Nuclear physics, magnetic spectrometer, liquid hydrogen target, polarized electron beam, parity-violation, electron scattering, 0103 physical sciences, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Instrumentation, Cherenkov radiation, Elastic scattering, Physics, Spectrometer, 010308 nuclear & particles physics, Scattering, Instrumentation and Detectors (physics.ins-det), Small-angle neutron scattering, Electron scattering
Abstract

In the G0 experiment, performed at Jefferson Lab, the parity-violating elastic scattering of electrons from protons and quasi-elastic scattering from deuterons is measured in order to determine the neutral weak currents of the nucleon. Asymmetries as small as 1 part per million in the scattering of a polarized electron beam are determined using a dedicated apparatus. It consists of specialized beam-monitoring and control systems, a cryogenic hydrogen (or deuterium) target, and a superconducting, toroidal magnetic spectrometer equipped with plastic scintillation and aerogel Cerenkov detectors, as well as fast readout electronics for the measurement of individual events. The overall design and performance of this experimental system is discussed., Comment: Submitted to Nuclear Instruments and Methods

Published
2011
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5. Recent results from the G0 experiment

Author

Douglas H Beck, R. D. McKeown, C. L. Capuano, M. Mihovilovic, M. Versteegen, S. Kox, Joseph Grames, W. D. Ramsay, C. Furget, G. Guillard, A. Coppens, J. Schaub, L. Lee, D. T. Spayde, G. Flores, S. A. Page, Junyu Liu, Michael Gericke, P. M. King, C. Ellis, F. Benmokhtar, E. Voutier, P. G. Roos, E. J. Beise, W. T. H. van Oers, L. Bimbot, V. Tadevosyan, J. S. Real, H. Breuer, S. F. Pate, H. Mkrtchyan, Jay Benesch, S. E. Williamson, S. K. Phillips, J. Roche, S. A. Wood, J. Hansknecht, T. Seva, M. Muether, V. Papavassiliou, S. Wells, W. F. Vulcan, T. Horn, Y. C. Chao, C. A. Davis, J. W. Martin, B. P. Quinn, M. Poelker, Neven Simicevic, D. Gaskell, M. K. Jones, Wolfgang Korsch, A. Micherdzinska, Darko Androić, A. Lung, P. Bosted, R. Suleiman, J. Arvieux, P. Pillot, M. Stutzman, J. Birchall, Juliette Mammei, G. B. Franklin, Michael Pitt, S. L. Bailey, D. S. Armstrong, G. R. Smith, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and G0

Subjects
Physics, Quark, Particle physics, Strange quark, Scattering, QC1-999, Momentum transfer, Nuclear Theory, Electron, Weak interaction, 7. Clean energy, Nuclear physics, Dipole, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, Nucleon, Nuclear Experiment
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.

Published
2010
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6. Strange Quark Contributions to Parity-Violating Asymmetries in the Backward Angle G0 Electron Scattering Experiment

Author

A. Coppens, A. Lung, Junyu Liu, J. Arvieux, M. Stutzman, J. Schaub, Fatiha Benmokhtar, W. D. Ramsay, J. Roche, D. T. Spayde, S. Wells, C. L. Capuano, S. F. Pate, Y. C. Chao, L. Bimbot, P. Pillot, T. Horn, B. P. Quinn, J. Grames, J. Hansknecht, T. Seva, M. I. W. Gericke, Wolfgang Korsch, W. F. Vulcan, H. Breuer, M. Poelker, J. S. Real, V. Papavassiliou, J. Benesch, R. Suleiman, Douglas H Beck, J. W. Martin, M. Muether, Juliette Mammei, G. B. Franklin, Darko Androić, Michael Pitt, R. D. McKeown, S. K. Phillips, H. Mkrtchyan, S. A. Page, C. A. Davis, P. Bosted, G. Flores, M. Versteegen, Neven Simicevic, C. Furget, S. Kox, P. G. Roos, E. Voutier, S. L. Bailey, L. Lee, W. T. H. van Oers, P. M. King, J. Birchall, D. S. Armstrong, G. R. Smith, M. Mihovilovič, D. Gaskell, M. K. Jones, E. J. Beise, G. Guillard, S. A. Wood, V. Tadevosyan, A. Micherdzinska, C. Ellis, S. E. Williamson, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), and G0

Subjects
Quark, Strange quark, Particle physics, media_common.quotation_subject, Nuclear Theory, FOS: Physical sciences, axial-vector current, General Physics and Astronomy, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Strangeness, strange quark, 01 natural sciences, 7. Clean energy, Asymmetry, Nuclear physics, parity-violating asymmetries, charge and magnetic nucleon form factors, 0103 physical sciences, Nuclear Experiment (nucl-ex), Nuclear Experiment, 010306 general physics, media_common, Elastic scattering, Physics, Neutral current, 010308 nuclear & particles physics, Scattering, NATURAL SCIENCES. Physics, PRIRODNE ZNANOSTI. Fizika, High Energy Physics::Experiment, Nucleon, 11.30.Re, 13.60.-r, 14.20.Dh, 25.30.Bf
Abstract

We have measured parity-violating asymmetries in elastic electron-proton and quasi-elastic electron-deuteron scattering at Q^2 = 0.22 and 0.63 GeV^2. They are sensitive to strange quark contributions to currents in the nucleon, and to the nucleon axial current. The results indicate strange quark contributions of < 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 current at these four-momentum transfers., 5 pages, 2 figures, changed references, typo, and content

Published
2010
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