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<font color="#000099"><b><font color="#3333ff">Physics Seminar<br>
Friday, May 25, 2011<br>
11:00AM<br>
CEBAF Center AUD.<br>
<font color="#3333ff">Cookies & Coffee at 10:45AM</font></font></b></font><br>
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<b><font color="#ff0000">James Vary
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Iowa State University
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"From QCD to ab initio Nuclear Structure with Point Nucleons and
Back Again"
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The vision of solving the nuclear many-body problem with fundamental
interactions tied to QCD via chiral perturbation theory appears to
be gaining credibility. The goals are to preserve the predictive
power of the underlying theory, to test fundamental symmetries with
the nucleus as laboratory and to develop new understandings of the
full range of complex nuclear phenomena.
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With a non-relativistic approach based on chiral perturbation theory
as a starting point, I introduce the Quark Cluster Model of Pirner
and Vary and associated percolation concepts. This model
hypothesizes a transition from physics dominated by hadronic degrees
of freedom to quark-gluon degrees of freedom at an intermediate
momentum transfer regime characteristic of the chiral symmetry
breaking scale. The "back again" route adopts results from the
ab-initio long-range physics (momentum transfers below the chiral
symmetry breaking scale) to constrain the short range probabilities
(and associated phenomena at momenta higher than the chiral symmetry
breaking scale) via orthnormality and completeness. DIS scattering
data on light nuclei present important test cases for mapping this
transition.
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