Eur. Phys. J. A (2005) 24: 55-58
https://doi.org/10.1140/epjad/s2005-04-012-4

III Weak form factors of the nucleon. III-1/PV experiment

The next generation HAPPEX experiments

Syracuse University, Syracuse, NY 13244, USA

Received: 15 October 2004
Published online: 8 February 2005

Abstract

A new generation of parity violating electron scattering experiments began running in Summer 2004 at the Thomas Jefferson National Accelerator Facility. HAPPEX-H will measure the parity violating asymmetry in polarized electron scattering from protons at Q ² = 0.11 (GeV/c)². This asymmetry is sensitive to a linear combination of the strange electric and magnetic form factors of the proton. HAPPEX-He will measure the parity violating asymmetry in polarized electron scattering from a ⁴He target at the same value of Q ², using the same spectrometers and similar detectors, accessing the strange electric form factor cleanly. PREX will use parity violating electron scattering to determine the neutron radius of the ²⁰⁶Pb nucleus.

PACS: 13.60.Fz Elastic and Compton scattering – 11.30.Er Charge conjugation, parity, time reversal, and other discrete symmetries – 13.40.Gp Electromagnetic form factors – 14.20.Dh Protons and neutrons – 24.80.+y Nuclear tests of fundamental interactions and symmetries – 21.10.Gv Mass and neutron distributions – 25.30.Bf Elastic electron scattering