Abstract
The nucleon’s strange electric and magnetic form factors G s E and G s M can be probed via parity-violating electron scattering. The HAPPEX Collaboration has made new measurements of the parity-violating asymmetry A PV in elastic scattering of 3 GeV electrons off hydrogen and 4He targets with <ϑ lab > ≈ 6.0°. For 4He the preliminary result is A PV = (+6.43 ± 0.23 (stat) ± 0.22 (syst)) × 10−6. For hydrogen the preliminary result is A PV = (−1.60 ± 0.12 (stat) ± 0.05 (syst)) × 10−6. From these values we extract G s E = 0.004 ± 0.014 ± 0.013 at <Q 2> = 0.077 GeV/c 2, and G s E + 0.09G s M = 0.004 ±0.011 ± 0.005 at <Q 2> = 0.109 GeV/c 2, both consistent with zero, providing stringent new limits on the role of strange quarks in the vector structure of the nucleon.PACS25.30.Bf Elastic electron scattering12.15.-y Electroweak interactions11.30.Er Charge conjugation, parity, time reversal, and other discrete symmetries14.20.Dh Protons and neutrons
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
