[Frost] Abstract for NSTAR and INPC Hadron Structure conferences

[Ross Tucker]

Hi all-
Sorry for late notice. I need to request comments by tomorrow before I
send to clas_hadron.

Determination of T and F observables using $\eta$ photoproduction on
the CLAS Frozen Spin Target (FROST).

R. Tucker, M. Dugger, B. Ritchie, I. Senderovich, B. T. Morrison, and
the CLAS Collaboration
Arizona State University*

Abstract:
Polarization observables are an important tool for understanding and
clarifying baryon resonance spectra. Recently, experiments were
conducted at Jefferson Lab using a polarized photon beam incident on a
polarized frozen spin target (FROST). We present preliminary data of
the T and F asymmetries for $\eta$ photoproduction from the proton,
along with comparisons to theoretical predictions. The data used in
the present analysis were taken during the second running period of
FROST using the CLAS detector at Jefferson Lab, which utilized
transversely polarized protons in a butanol target and an incident
tagged photon energy between 0.62 and 2.93 GeV. The T asymmetry is the
observable related to transverse target polarization and the world
database currently contains 38 such measurements. The F asymmetry is a
double-polarization observable that requires circular beam
polarization in addition to transverse target polarization. There have
been no published measurements of F .

* Work at Arizona State University is supported by the U.S. National
Science Foundation.