Special Colloquium
Monday, May 1, 2006
3:30 PM
Physics Building, Room 204
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"Using Parity Violation to Probe Strange Quarks in the Nucleon"

Kent Paschke , University of Massachusetts
[Host: Nilanga Liyanage]
The basic nuclear building block of our day-to-day world, the nucleon, is well described in terms of quarks of only two varieties: the up and down quarks. However, the nucleon is more complex than the apparent success of the constituent quark model would imply. One example of this complexity is the possible role of the strange quark in the nucleon. Precision measurements of parity violation in electron scattering, a symmetry violation which is forbidden under the electromagnetic interaction but allowed by the weak force, can be used to disentangle the contributions of strange quarks from other components of the nucleon electric and magnetic structure. I will report new results on the most precise measurement to date of parity-violation in electron-nucleon scattering, from the HAPPEX collaboration at Thomas Jefferson National Accelerator Facility, and discuss implications for the question of strange quarks in the nucleon.

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