[Clas_hadron] Abstract for NStar2011 - Morrison

[Brian Morrison]

Abstract:
Preliminary results of the helicity asymmetry E for eta meson
photoproduction on the proton for the CLAS collaboration.

Brian Morrison, Arizona State University*

Polarization observables are an important tool for understanding and
clarifying baryon resonance spectra.  Compared to differential
cross-section data, very few data exist.  Recently double polarization
experiments were conducted at Jefferson Lab using a polarized photon beam
and a polarized frozen spin target (FroST).  All data used in this
analysis were taken during the first running period of FroST using the
CLAS detector at Jefferson Lab with photon energies ranging from 329 MeV
to 2.35 GeV.  We present preliminary data for the E polarization
observable for eta meson photoproduction at threshold and above, along
with comparisons to several theoretical predictions.

*Work at ASU is supported by the U.S. National Science Foundation.




I will be presenting some preliminary results for the E helicity asymmetry
for the g9a data.  Please respond with any questions or comments to
clas_hadron at jlab.org.  Thanks.

-Brian Morrison