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Theory Center Seminar<br>
Monday, May 8, 2017<br>
1:00 p.m. (coffee at 12:45 p.m.)<br>
<div> CEBAF Center, Room L102<br>
<br>
Jannes Nys<br>
Ghent University<b><br>
<br>
</b><b>Using Finite-Energy Sum Rules to Connect High- and
Low-Energy Amplitudes</b><br>
<br>
While the nucleon excitation spectrum below 2 GeV is fairly well
explored experimentally, little is known about <br>
the resonances above this mass. Since the number of relevant
partial waves grows with energy, additional theoretical <br>
constraints are necessary to constrain the amplitudes. Dispersive
approaches allow one to use high-energy data to <br>
constrain the low-energy models that aim at mapping the baryon
spectrum. I illustrate how the dispersive approach <br>
of Finite-Energy Sum Rules can be used to do the inverse:
predicting the scattering amplitudes at high energies based<br>
on low-energy models.</div>
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