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