Monday, June 20 h. 15.00 

Aula Fisica del Nucleo

Krishna Kumar , Massachusettes U. - USA  

Parity-Violating Electron Scattering: Past, Present and Future



The study of the weak neutral current (WNC), mediated by the Z boson, plays a central role in tests of strong and electroweak interactions.
In fixed target electron scattering, the WNC amplitude can be isolated by measuring the fractional difference in the scattering of right- and left-handed longitudinally polarized electrons on unpolarized nuclear targets. Such asymmetries are a signature of parity-violation and range from 100 parts per million (ppm) in deep inelastic scattering to as small as 0.1 ppm in electron-electron scattering. After a brief historical overview, new results from the E158 experiment at SLAC and the HAPPEX program at Jefferson Lab will be presented. New ideas on parity-violating electron scattering for future accelerator facilities will be discussed.




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MCD, 19/5/2000   updated 19/06/2002