Anthony, P. L. and Bega, K. and Carr, R. and Gao, J. and Gustafsson, K. and Hughes, E. W. and Jones, G. M. and Mastromarino, P. and McKeown, R. D. (2004) Observation of Parity Nonconservation in Møller Scattering. Physical Review Letters, 92 (18). Art. No. 181602. ISSN 0031-9007. http://resolver.caltech.edu/CaltechAUTHORS:20110708-144426190
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We report a measurement of the parity-violating asymmetry in fixed target electron-electron (Møller) scattering: A_(PV) = [-175 ± 30(stat)± 20(syst)] X 10^(-9). This first direct observation of parity nonconservation in Møller scattering leads to a measurement of the electron’s weak charge at low energy Q^e_W = -0:053 ± 0:011. This is consistent with the standard model expectation at the current level of precision: sin^2θ_W = (M_Z)_(MS) = 0:2293 ± 0:0024(stat) ± 0:0016(syst) ± 0:0006(theory).
|Additional Information:||© 2004 The American Physical Society. Received 11 December 2003; published 7 May 2004. We thank the SLAC staff for their efforts in helping develop and operate the E158 apparatus, and especially A. Brachmann and T. Maruyama for their essential work on the polarized electron source. This work was supported by Department of Energy Contract No. DE-AC03-76SF00515, and by the Division of Nuclear Physics at the Department of Energy and the Nuclear Physics Division of the National Science Foundation in the United States and the Commissariat à l’Énergie Atomique and the Centre National de la Recherche Scientifique in France.|
|Classification Code:||PACS: 11.30.Er, 12.15.Mm, 13.66.Jn, 13.88.+e|
|Official Citation:||Observation of Parity Nonconservation in Møller Scattering P. L. Anthony et al. (SLAC E158 Collaboration) Published 7 May 2004 (4 pages) 181602|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Ruth Sustaita|
|Deposited On:||11 Jul 2011 14:33|
|Last Modified:||26 Dec 2012 13:22|
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