[G8b_run] Abstract for NSTAR 2011

[Charles Hanretty]

Hello,
     I would like to submit an abstract for the NSTAR 2011 conference. I
have placed it in the appropriate jlab directory:
http://www.jlab.org/Hall-B/secure/hadron/abstracts/2011/

The text may also be found below:

Constituent Quark Models predict an excited baryon spectrum much richer in
resonances than that which has been observed experimentally, the so-called
\textit{missing resonance} problem. Detection of these short-lived states
may come about through measurements of quantities called
\textit{polarization observables}. These observables occur when the
constraint of polarization is imposed on the reactions and are highly
sensitive to resonance production. The expected sequential decay of these
N* resonances via $\pi\Delta$ and N$\rho$ intermediate states makes the
double pion final state an attractive final state to study to reveal these
missing resonances. In recent years, both single- and double-polarization
experiments have been carried out as part of the N* program at Jefferson
Lab in Newport News, Virginia with the goal of resolving this missing
resonance problem. One such polarized photoproduction experiment used
linearly polarized photons incident on an unpolarized LH$_{2}$ target. The
analysis of $\vec{\gamma}~p$~$\rightarrow$~$p~\pi^{+}~\pi^{-}$ reactions
found in these polarized photoproduction data using the power of a
kinematic fitter results in highly accurate measurements of these
observables. The analysis of this $p~\pi^{+}~\pi^{-}$ final state and the
extraction of two such observables, I$^{s}$ and I$^{c}$, will be
discussed.

Comments, suggestions and rants about how late this is are welcome.

--
Cheers,
Charles Hanretty