[Jlab-seminars] Physics Seminar Announcement

[Luci Collins]

*Physics Seminar
Friday, March 12, 2010
11:00AM
CEBAF Center AUD.
Cookies & Coffee at 10:45AM*


*"Hadron Spectroscopy from QCD"

Jo Dudek
Jefferson Lab & ODU*

Jefferson Lab Theory Center members, as part of the "Hadron Spectrum 
Collaboration", have developed and applied advanced field-theoretical 
techniques to enable the extraction of the excited state hadron spectrum 
from Lattice QCD computations. I will present some highlights of this 
large-scale program including a demonstration in a model-independent 
framework that mesons with exotic quantum numbers exist within QCD and 
are likely in a mass region accessible to the 12 GeV CEBAF. I will also 
discuss the extraction of an excited baryon spectrum and the possibility 
of computing transition form-factors and photocouplings of excited and 
exotic hadrons.

As well as the reliable extraction of state energies, we are beginning 
to build a quark-gluon phenomenology from interpretation of the QCD 
matrix elements measured in lattice calculations. Amongst other things, 
this demonstrates that exotic quantum numbered states are indeed hybrid 
mesons featuring an excited gluonic field and not, for example, 
multiquark states. These methods can be used to shed light on the 
internal structure of the entire spectrum of meson and baryon 
excitations and to probe the limitations of simple models currently in 
use to describe these states.

I will conclude by describing directions currently being explored to 
explicitly observe resonant behaviour in QCD, allowing for extraction of 
the hadronic decay widths of excited mesons and baryons.


Upcoming Physics Seminars
-------------------------

March 22: Jaiwei Mei (Indiana University)

March 24, 26, 29: Series by Leonard Gamberg (Penn State)

April 16: Simona Malace (SCU)


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