[G14_run] Abstract for NStar 2017

[Dr. A.M. Sandorfi]

Haiyun,

I think you need a couple of sentences to introduce the topic. How about the
slightly modified version below.
Andy

_______________________
The excited-state spectrum of the nucleon is a complicated overlap of many
resonances that must be disentangled through multipole analyses of reaction
amplitudes. Meson photoproduction, which has been a fruitful probe of N*
structure, requires data on many different polarization observables to
constrain its four complex amplitudes. While considerable data has been
accumulated with proton targets, comparatively little information is
available from neutron targets. Recently, the first beam-target helicity
asymmetries in the γn(p) → π−p(p) reaction, measured with circularly
polarized photons and longitudinally polarized neutrons in deuterium, have
been reported in Physical Review Letters 118, 242002 (2017). This talk
presents a parallel analysis from the same experiment of the beam-target
double-polarization observable "G" for the same reaction. Linearly polarized
photons were incident on longitudinally polarized deuterons in solid
hydrogen deuteride (HD), and the π− and p reaction products were detected in
the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson lab. Different
beam and target orientations were combined to extract the beam (Σ) and the
beam-target (G) asymmetries. Results for the Σ observable are consistent
with other published measurements. The energy and angular dependence of
results for G will be reported, together with comparisons to predictions
from existing partial wave analyses.
__________________________




On 6/18/17, 11:58 AM, "Haiyun Lu" <hlu at jlab.org> wrote:

> Dear HDIcer,
> 
> I attached the draft abstract for NStar 2017 conference. Could you
> please read and send me feedbacks?
> 
> Thank you and best regards,
> 
> Haiyun
> 
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