[Primex2] APS abstract

[pawel at jlab.org]

Hi Li,

Compton scattering off atomic electrons is the best known fundamental QED
process, however, a precision measurement of its cross section for the beam
energy higher than 1 GeV has not been performed until now.
An updated high precision measurement of the neutral pion lifetime via the Primakoff
effect (PrimExII experiment) was performed in Hall B of Jefferson Lab in 2010. The
experiment used small angle coherent photoproduction of π0’s in the Coulomb
field of a nucleus, i.e. the Primakoff effect, to determine the π0 lifetime with
precision better than 1.5% . It therefore requires a thorough understanding
of the underlying systematic uncertainties. To facilitate that data for well
known electromagnetic processes were taken concurrently with the photoproduction
data. We will present an analysis that pertains to measuring
the Compton scattering cross section, which occurs at similar kinematics as
the primary process. The combination of the well established theory for this
process with large collected statistics allowed to extract this cross section
with high precision in an energy region of 4-5 GeV for 12C and 28Si targets.
The results of this analysis will be presented.

These are my 2 cents. As Ashot pointed out check the article (a/an/the) usage
with some native speaker. I'm guessing the title might be OK, but that's only
a guess.

Pawel