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Precision measurement of the weak mixing angle in Møller scattering

Anthony, P. L. and Arnold, R. G. and Arroyo, C. and Bega, K. and Biesiada, J. and Bosted, P. E. and Bower, G. and Cahoon, J. and Carr, R. and Cates, G. D. and Chen, J. -P and Chudakov, E. and Cooke, M. and Decowski, P. and Deur, A. and Emam, W. and Erickson, R. and Fieguth, T. and Field, C. and Gao, J. and Gary, M. and Gustafsson, K. and Hicks, R. S. and Holmes, R. and Hughes, E. W. and Humensky, T. B. and Jones, G. M. and Kaufman, L. J. and Keller, L. and Kolomensky, Yu. G. and Kumar, K. S. and LaViolette, P. and Lhuillier, D. and Lombard-Nelsen, R. M. and Marshall, Z. and Mastromarino, P. and McKeown, R. D. and Michaels, R. and Niedziela, J. and Olson, M. and Paschke, K. D. and Peterson, G. A. and Pitthan, R. and Relyea, D. and Rock, S. E. and Saxton, O. and Singh, J. and Souder, J. and Szalata, Z. M. and Turner, J. and Tweedie, B. and Vacheret, A. and Walz, D. and Weber, T. and Weisand, J. and Woods, M. and Younus, I. (2005) Precision measurement of the weak mixing angle in Møller scattering. Physical Review Letters, 95 (8). 081601. ISSN 0031-9007. http://resolver.caltech.edu/CaltechAUTHORS:20090407-132703774

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Abstract

We report on a precision measurement of the parity-violating asymmetry in fixed target electron-electron (Møller) scattering: A_PV = [-131 ± 14(stat) ± 10(syst)] × 10^-9, leading to the determination of the weak mixing angle sin^(2)Θ^(eff)(_W) = 0.2397 ± 0.0010(stat) ± 0.0008(syst), evaluated at Q^2 = 0.026  GeV^2. Combining this result with the measurements of sinΘ^(2)θ^(eff)(_W) at the Z^0 pole, the running of the weak mixing angle is observed with over 6σ significance. The measurement sets constraints on new physics effects at the TeV scale.


Item Type:Article
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http://dx.doi.org/10.1103/PhysRevLett.95.081601DOIUNSPECIFIED
http://link.aps.org/doi/10.1103/PhysRevLett.95.081601PublisherUNSPECIFIED
Additional Information:© 2005 American Physical Society. Received 26 April 2005; published 17 August 2005. We thank the SLAC staff for their efforts in helping develop and operate the E158 apparatus, and especially the Polarized Electron Source and Accelerator Operations groups.We would also like to thank A. Czarnecki, J. Erler, W. J. Marciano, and M. Ramsey-Musolf for stimulating discussions, and A. Ilyichev, J. Suarez, and V. Zykunov for providing the radiative correction software. This work was supported by Department of Energy Contract No. DEAC02- 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.
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Funding AgencyGrant Number
Department of EnergyDE-AC02-76SF00515
NSFUNSPECIFIED
Commissariat à l’Énergie AtomiqueUNSPECIFIED
Centre National de la Recherche ScientifiqueUNSPECIFIED
Record Number:CaltechAUTHORS:20090407-132703774
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20090407-132703774
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:13877
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:16 Jul 2009 19:58
Last Modified:26 Dec 2012 10:56

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