[Clas_hadron] Fwd: NSTAR abstract

Eugene Pasyuk pasyuk at jlab.org
Sat Mar 12 20:19:38 EST 2011



-------- Original Message --------
Subject: 	email problem/NSTAR abstract
Date: 	Sat, 12 Mar 2011 20:14:07 -0500
From: 	Charles Hanretty <charleshanretty at gmail.com>
To: 	pasyuk at jlab.org



Eugene,
         It seems I can't send an email to the g8b mailing list
(g8b_run at jlab.org <mailto:g8b_run at jlab.org>). When I try, I get an email
from g8b_run-owner at jlab.org <mailto:g8b_run-owner at jlab.org> saying
"Sorry, posting to this list is restricted." Therefore would you please
send out the following email on my behalf?

---------------------------------------------------------------------------------------------------------------------------
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
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-- 
Thank you Eugene,
Charles Hanretty



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