[Sane-analysis] Abstract for DNP 2013

[anusha at jlab.org]

Hi Everybody,
Here is my abstract for DNP 2013. You are very welcome to make any
comments...

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Title:
New measurement of the proton form factor ratio with polarized beam and
target

Abstract:
The form factors are fundamental properties of the nucleon representing
the effect of its structure on the response to electromagnetic probes. The
ratio of the electric and magnetic form factors of the proton has been
measured with doubly polarized elastic electron-proton scattering at Q2 =
2.06 and 5.66 (GeV/c)2 using the double spin asymmetry for a target spin
aligned nearly perpendicular to the beam direction.
This alternative measurement of GpE/GpM has verified and confirmed the
dramatic discrepancy at high Q2 between the Rosenbluth separation and
polarization transfer methods with a different technique and systematic
uncertainties uncorrelated to those of the recoil-polarization
measurements. The measurement of the form factor ratio at Q2 = 2.06
(GeV/c)2 is in agreement with an earlier measurement with the polarized
target technique at similar kinematics. The four-momentum transfer squared
of Q2 = 5.66 (GeV/c)2 represents the highest Q2 value reached with the
double spin asymmetry to date. The results of this experiment will be
presented.
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Thanks and Best Regards
Anusha