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Precision Measurements

(to learn more about Neptune's discovery, see the December 2004 issue of Scientific American)


E158 searches for New Physics at high energy scales by making precision measurements of the parity-violating asymmetry in Mller (electron-electron) scattering.  This parity violation arises from interference between the electromagnetic (photon - exchange) and weak (Z - exchange) scattering amplitudes depicted in the figure below. A deviation in the measured asymmetry from the Standard Model prediction would indicate an additional photon-Z' interference effect arising from a yet-to-be discovered new force.

Last Update: 14 Apr 2005