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  Improved limits on the weak, neutral, hadronic axial vector coupling constants from quasielastic scattering of polarized electrons.

Heil, W., Ahrens, J., Andresen, H. G., Bornheimer, A., Conrath, D., Dietz, K. J., et al. (1989). Improved limits on the weak, neutral, hadronic axial vector coupling constants from quasielastic scattering of polarized electrons. Nuclear Physics B, 327(1), 1-31. doi:10.1016/0550-3213(89)90284-8.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002C-278B-9 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002C-2791-A
Genre: Journal Article

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Heil, W., Author
Ahrens, J., Author
Andresen, H. G., Author
Bornheimer, A., Author
Conrath, D., Author
Dietz, K. J., Author
Gasteyer, W., Author
Gessinger, H.-J., Author
Hartmann, W., Author
Jethwa, J.1, Author              
Kluge, H. J., Author
Kessler, H., Author
Kettner, T., Author
Koch, L., Author
Neugebauer, F., Author
Neuhausen, R., Author
Otten, E. W., Author
Reichert, E., Author
Schäfer, F. P.1, Author              
Wagner, B., Author
Affiliations:
1Abteilung Laserphysik, MPI for biophysical chemistry, Max Planck Society, ou_578547              

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 Abstract: In scattering polarized electrons (P1 = 44% by 9Be at an energy of 300 MeV at angles 115°⩽ϑ⩽145° a parity violating asymmetry of Acorr = (−3.5 ± 0.7 ± 0.2) × 10−6 was measured. After correction for finite electron polarization and background we deduce an experimental asymmetry of Acx = (−9.4 ± 1.8 ± 0.5) × 10−6. The quoted errors indicate the statistical and the systematic uncertainties, respectively. The asymmetry, which is dominated by the quasielastic cross section, is interpreted in terms of model-independent electron-nucleon coupling constants of the weak neutral current. The error limits in the sector of axial vector coupling constants have been improved by a factor of 3 over previous results. A model-dependent analysis for the Weinberg angle yields the result sin2θw = 0.221 ± 0.014 ± 0.004.

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Language(s): eng - English
 Dates: 2002-10-211989-11-29
 Publication Status: Published in print
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 Rev. Method: Peer
 Identifiers: DOI: 10.1016/0550-3213(89)90284-8
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Title: Nuclear Physics B
Source Genre: Journal
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Pages: - Volume / Issue: 327 (1) Sequence Number: - Start / End Page: 1 - 31 Identifier: -