Parity-Violating Electron Scattering from 4He and the Strange Electric Form Factor of the Nucleon
Abstract
We have measured the parity-violating electroweak asymmetry in the elastic scattering of polarized electrons from He4 at an average scattering angle ⟨θlab⟩=5.7° and a four-momentum transfer Q2=0.091GeV2. From these data, for the first time, the strange electric form factor of the nucleon GEs can be isolated. The measured asymmetry of APV=(6.72±0.84(stat)±0.21(syst))×10-6 yields a value of GEs=-0.038±0.042(stat)±0.010(syst), consistent with zero.
- Publication:
-
Physical Review Letters
- Pub Date:
- January 2006
- DOI:
- 10.1103/PhysRevLett.96.022003
- arXiv:
- arXiv:nucl-ex/0506010
- Bibcode:
- 2006PhRvL..96b2003A
- Keywords:
-
- 13.60.Fz;
- 11.30.Er;
- 14.20.Dh;
- 25.30.Bf;
- Elastic and Compton scattering;
- Charge conjugation parity time reversal and other discrete symmetries;
- Protons and neutrons;
- Elastic electron scattering;
- Nuclear Experiment
- E-Print:
- Phys.Rev.Lett. 96 (2006) 022003