[Jlab-seminars] Physics Seminar Announcement

[Luci Collins]

*Physics Seminar
Friday, May 25, 2011
11:00AM
CEBAF Center AUD.
Cookies & Coffee at 10:45AM*

*James Vary
Iowa State University

"From QCD to ab initio Nuclear Structure with Point Nucleons and Back 
Again" *

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.

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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