Phys. Rev. Lett. 92, 102003 (2004) [4 pages]
Parity-Violating Electron Deuteron Scattering and the Proton’s Neutral Weak Axial Vector Form Factor
T. M. Ito et al. SAMPLE Collaboration
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T. M. Ito1 *, T. Averett9, D. Barkhuff4, G. Batigne11, D. H. Beck2, E. J. Beise3, A. Blake1, H. Breuer3, R. Carr1, B. Clasie10, S. Covrig1, A. Danagoulian2, G. Dodson4, K. Dow4, D. Dutta10, M. Farkhondeh4, B. W. Filippone1, W. Franklin4, C. Furget11, H. Gao10, J. Gao1, K. Gustafsson1, L. Hannelius1, R. Hasty2, A. M. Hawthorne-Allen5, M. C. Herda3, C. E. Jones1, P. King3, W. Korsch6, S. Kowalski10, S. Kox11, K. Kramer9, P. Lee1, J. Liu3, J. W. Martin1, R. D. McKeown1, B. Mueller7, M. L. Pitt5, B. Plaster10, G. Quéméner11, J.-S. Réal11, J. Ritter1,5, J. Roche9, V. Savu1, R. Schiavilla12, J. Seely10, D. Spayde2, R. Suleiman10, S. Taylor10, R. Tieulent11, B. Tipton1, E. Tsentalovich4, S. P. Wells8, B. Yang4, J. Yuan1, J. Yun5, and T. Zwart4 (SAMPLE Collaboration)
1W. K. Kellogg Radiation Laboratory, California Institute of Technology, Pasadena, California 91125, USA
2Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
3Department of Physics, University of Maryland, College Park, Maryland 20742, USA
4Bates Linear Accelerator Center, Laboratory for Nuclear Science, Massachusetts Institute of Technology, Middleton, Massachusetts 01949, USA
5Department of Physics, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, USA
6Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506, USA
7Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
8Department of Physics, Louisiana Tech University, Ruston, Louisiana 71272, USA
9Department of Physics, College of William and Mary, Williamsburg, Virginia 23187, USA
10Laboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
11LPSC-Grenoble, IN2P3/CNRS-UJF, 38026, Grenoble, France
12Thomas Jefferson National Laboratory, Newport News, Virginia 23606, USA and Physics Department, Old Dominion University, Norfolk, Virginia 23529, USA
Received 30 September 2003; published 10 March 2004
We report on a new measurement of the parity-violating asymmetry in quasielastic electron scattering from the deuteron at backward angles at Q2=0.038 (GeV/c)2. This quantity provides a determination of the neutral weak axial vector form factor of the nucleon, which can potentially receive large electroweak corrections. The measured asymmetry A=-3.51±0.57 (stat)±0.58 (syst) ppm is consistent with theoretical predictions. We also report on updated results of the previous experiment at Q2=0.091 (GeV/c)2, which are also consistent with theoretical predictions.
©2004 The American Physical Society
URL: http://link.aps.org/doi/10.1103/PhysRevLett.92.102003
DOI: 10.1103/PhysRevLett.92.102003
PACS: 12.15.Lk, 11.30.Er, 13.60.–r, 14.20.Dh
* Electronic address: tito@krl.caltech.edu
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