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<b>Theory Center Seminars</b><br>
Monday, Jan. 5, 2015<br>
<i>Starting at </i>1:00 p.m. (coffee at 12:45 p.m.)<br>
CEBAF Center, Room L102<br>
<br>
<pre wrap=""><b>Vladyslav Pauk</b>
University of Mainz
CEBAF Center, Room L102
1:00 p.m.
<b>Light-by-light Scattering and the Anomalous Magnetic Moment of the Muon</b>
The process of two-photon production of hadrons has been playing a vital role in studying the strong interaction physics during the past few decades. Since the process is essentially non-perturbative in nature, the general constraints based on analyticity and unitarity become highly important for the interpretation of the phenomenon. A new approach based on sum rules for light-by-light scattering will be presented and applications for a number of problems related to both perturbative field theory and hadronic physics will be discussed in detail. The keen interest to the anomalous magnetic moment of muon is motivated by its high potential for probing physics beyond Standard Model. However, the interpretation of the quantity is undermined by large hadronic uncertainties. In view of the new muon (g-2) experiments at Fermilab and at J-PARC, a new dispersive formalism for evaluating the hadronic light-by-light (HLbL) scattering contribution to the muon's anomalous magnetic moment
will b
e presented. We provide a first realistic application of the proposed formalism to the case of pseudoscalar meson pole exchanges. Moreover, it allows for a more straightforward implementation of the experimental data. The ongoing measurements by the BES-III Collaboration will be a crucial input into the presented dispersive formalism.
<pre><b>Wim Cosyn</b>
Ghent University
CEBAF Center, Room L102
1:50 p.m.
<b>The Nucleus at Short Distances</b>
</pre><pre>Scattering reactions at intermediate energies with nuclear targets are indispensable in our quest to unravel the nature
of the strong force at hadronic length scales. They offer access to modifications of hadrons in the nuclear medium, are
used in the flavor separation of parton distribution functions, and teach us about hadronization and the short-range
structure of nuclei. Concentrating on the topics of nuclear final-state interactions and short-range correlations, I
highlight several contributions from my research to these studies. Second, I discuss future research possibilities in
this domain and show its importance and benefit for the JLab12 nuclear program and other intermediate energy experimental
facilities.
<b>Xian-Wei Kang</b>
Forschungszentrum Juelich
CEBAF Center, Room L102
2:40 p.m.</pre><pre><b>Antinucleon-Nucleon Scattering in Chiral EFT and the Related Hadron Physics</b></pre><pre>The recent progress of the antinucleon-nucleon (NNbar) interaction in chiral EFT will be reported. With such NNbar
potential, we show that the experimental observation of the near-threshold enhancement for the proton-antiproton (ppbar)
spectra from various decay channels can be understood as the final-state (ppbar) interaction effects.</pre></pre>
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