[Primex2] Primex2 Compton DNP 2017 talk

[pawel at jlab.org]

Mr. Li,

You're almost there!
Here are my comments/suggestions.

You use a word "test/tested" in a couple of places in the presentation. We are not
testing this theory. It's more like it tests us and our capabilities. The fact that is
so well understood allows us to measure it with such high accuracy and precision. In
this spirit, I'd suggest you change "test/tested" to "measurement/measured".

There are statistics boxes on your plots. Either remove them by redoing the plots or
cover them with white boxes in PowerPoint.

Slide 3:

- I would change "Electron Compton scattering is one of the simplest and most
fundamental reactions in QED." to "Electron Compton scattering is one of the most
fundamental and the best theoretically founded reactions in QED.",

- lose the arrows and number the diagrams instead,

- begin from a new line "Compton scattering in a few GeV electron energy has not been
tested experimentally."

- change "Compton scattering in a few GeV electron energy has not been tested
experimentally." to "Compton scattering in a few GeV electron energy has not been
measured experimentally."

- correct electon to electron in the line above

- change "Precision test of Higher Order QED calculation" to "Precision measurement of
Compton Scattering along with Higher Order Radiative Processes". You might also combine
the last sentence from the bullet above with this sentence to read "The first precision
measurement of Compton Scattering, along with Higher Order Radiative Processes, in a few
GeV region."

- move zero from subscript to superscript in "Validate systematic error for π0 lifetime
measurement (PrimEx-II) ."

Slide 5:

- add an e at the end of "angle between two clusters in HyCal plan".

Slide 7:

- for consistency, move the listing of the cuts onto the plot as you did on the previous
slide.

Slide 8:

- back ground ---> background

Slide 13:

Since the results are preliminary, I think it is safer to go with 3 significant figures
in the cross section results and one sig fig for the errors. Especially, remove the zero
in Stat Error for Silicon to have 0.001(0.37%).
Slide 14:

I would phrase it as follows

- Compton Scattering is one of most fundamental reactions in QED,
- It was measured with high precision for energies ranging from 4.4 to 5.3 GeV, - The
measurement provides an excellent systematic error control for PrimExII experiment.
- The extracted total cross section, together with radiative processes, is in agreement
with theory prediction at level of error of 1.4% , 1.6%, 1.7% for Carbon (1 and 2) and
Silicon targets respectively.

You might want to add a bullet with your future plans like performing a deconvolution of
the 1. and 2. type of processes, extracting the differential cross section for angles
available in this experiment, and publishing.

Stylistically, you may want to consider changing the background
between the header and the footer on your slides to match your plots background. This
may provide a cleaner feel to your presentation.
This is not crucial. If you like what you have go ahead and use it.

All in all, your presentation looks nice and crisp!
Now all you have to do is to deliver it this way.
One thing you need to do to do that is to find a room
with a projector in the lab and take a look at your slides.

When is your talk and when do you leave?
Would there still be time for a practice talk?

Let us know when you wake up.
Pawel