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Theory Center Seminar
<br>
Monday, March 22, 2010
<br>
1:00 p.m.
<br>
CEBAF Center, Room L104
<br>
Coffee at 12:45 p.m.
<br>
<br>
<b>Properties of Ground and Excited State Hadrons From Lattice QCD
</b><br>
<br>
Daniel Mohler
<br>
TRIUMF, Canada
<br>
<br>
Over the years the determination of ground state hadron masses from
<br>
lattice QCD has continuously improved. While these states are a good
<br>
benchmark for lattice calculations, a large number of hadron
excitations
<br>
are known and it would be desirable to calculate their properties from
<br>
first principles. This turns out to be a highly non-trivial task, as
<br>
excited states only contribute as sub-leading exponentials to Euclidean
<br>
correlation functions. In this talk I will briefly describe one
possible
<br>
method for the calculation of excited state properties and present
<br>
results for light-quark mesons from simulations with chirally improved
<br>
fermions. For scalar mesons, both conventional quark-antiquark states
as
<br>
well as a tetraquark interpretation will be considered. In addition, I
<br>
will present some (preliminary) results for baryon axial charges.
<br>
<br>
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