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P. A. Souder; R. Holmes; D.-H. Kim; K. S. Kumar; M. E. Schulze; K. Isakovich; G. W. Dodson; K. W. Dow; M. Farkhondeh; S. Kowalski; M. S. Lubell; J. Bellanca; M. Goodman; S. Patch; Richard Wilson; G. D. Cates; S. Dhawan; T. J. Gay; V. W. Hughes; A. Magnon; R. Michaels; H. R. Schaefer

doi:10.1103/PhysRevLett.65.694

Measurement of parity violation in the elastic scattering of polarized electrons from ${}^{12}C$

P. A. Souder, R. Holmes, D.-H. Kim, K. S. Kumar, M. E. Schulze, K. Isakovich, G. W. Dodson, K. W. Dow, M. Farkhondeh, S. Kowalski, M. S. Lubell, J. Bellanca, M. Goodman, S. Patch, Richard Wilson, G. D. Cates, S. Dhawan, T. J. Gay, V. W. Hughes, A. Magnon, R. Michaels, and H. R. Schaefer

Phys. Rev. Lett. 65, 694 – Published 6 August 1990

Abstract

We have measured the parity-violating electroweak asymmetry in the elastic scattering of polarized electrons from ${}^{12}C$ nuclei. Our result is $A_{expt}$ =0.60±0.14±0.02 ppm, where the first error is statistical and the second is systematic. With a beam polarization of 0.37, we compute the isoscalar vector hadronic coupling constant γ̃ to be 0.136±0.032±0.009. The standard model predicts γ̃=0.155 at the tree level, in agreement with our data.

Received 8 May 1990

DOI:https://doi.org/10.1103/PhysRevLett.65.694

Authors & Affiliations

P. A. Souder, R. Holmes, D.-H. Kim, K. S. Kumar, and M. E. Schulze

Syracuse University, Syracuse, New York 13210

K. Isakovich, G. W. Dodson, K. W. Dow, M. Farkhondeh, and S. Kowalski

Bates Linear Accelerator Center, Laboratory for Nuclear Science, Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139

M. S. Lubell