[Jlab-seminars] Physics Seminar Announcement

[Luci Collins]

*Physics Seminar
Sept. **28, 2012
11:00 AM
CEBAF Center AUD.
Cookies and Coffee 10:45AM

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*Mark Strikman
Penn State University**

"The EMC Effect - 30 Years After the Discovery"*

The discovery of the  EMC effect 30 years ago provided the first model independent evidence for the presence of non-nucleonic degrees of freedom in nuclei. Numerous models of the EMC effect were suggested. Important constraints on the dynamics of the EMC effect emerged over the years from a number of the experimental studies. Most critical were   observations of the suppression of the anti-quarks in nuclei, and  direct observations of   predominantly nucleonic short-range correlations in a series of experiments mostly performed at Jefferson Lab.  All together this allowed to narrow down significantly the list of possible explanations of the EMC effect and strengthened the expectation that the EMC effect is dominated by the contribution of the short-range correlations. Analysis of the data taking into  account  the difference between  the Bjorken x for nuclei and proton, and the contribution of equivalent photons has found that the non-nucleonic effects are a factor of two smaller than previously thought for x ? 0.5 and start rising dramatically at higher x.   A dynamical model which explains this pattern based on the presence of small size configurations in nucleons is outlined and possibilities to test it in the future experiments at Jefferson Lab as well as in the forthcoming pA run at the LHC are discussed.


Upcoming Physics Division Seminars
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Oct. 3rd Higgs Boson by Dmitri Denisov at 4pm CC auditorium
Oct. 9th learn about "git" software by Jeff King at 11am CC F113






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