Krishna S. Kumar



Sayak Chatterjee

Jonathan Mott

Jhih-Ying Su 

Andrew Hurley

Steven Zhang

Luc Barrett 


Useful Links


MOLLER at Jefferson Laboratory


E158 at SLAC


HAPPEX at Jefferson Laboratory


PREX at Jefferson Laboratory


Parity-Violating Electron Scattering

In parity-violating electron scattering experiments, we are able to access the subtle effects of the neutral weak force (mediated by the Z0 boson) between electrons and target particles, by measuring the tiny difference in the probability for scattering with incident right- or left-handed electrons. We use such measurements to:

      * Probe the strange quark structure of the nucleon (HAPPEX series of experiments at Jefferson Lab)

      * Measure the neutron skin in a heavy, spinless nucleus such as 208Pb and 48Ca (PREX and CREX Experiments at Jefferson Lab) more...

      * Probe the validity of the electroweak theory with high sensitivity at low energy and thus indirectly test theories of new physics at the TeV scale (E158 at SLAC and MOLLER/SoLID at Jefferson Lab) more...



In the news archive (2000-2012):

* E158

SLAC Press Release

Physics Today article: September 2005

Nature article: May 2005 "News and Views"


Jefferson Lab News Release


DoE Pulse News Tickler

PREX first result published in PRL:



The PREX and CREX Experiments at Jefferson Lab have made landmark measurements of the neutron RMS radia of Ca-48 and Pb-208.   more...


New parity-violating electron scattering projects MOLLER and SOLID are under development for Jefferson Laboratory using the upgraded 11 GeV beam. more