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| Special Colloquium
Monday, May 1, 2006
Physics Building, Room 204
Note special date.
[Host: Nilanga Liyanage]
University of Massachusetts
"Using Parity Violation to Probe Strange Quarks in the Nucleon"
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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