[Primex2] APS April Meeting slides Compton

[Gan, Liping]

Hi, Li,

Here are my a few comments:


1.      For the title on the  first slide, “electron” should be removed.

2.      The slide 3, my suggestion for your first sentence is “Electron Compton scattering is one of the most fundamental and the best theoretically known reaction in QED”. The reference for the higher order corrections should be L. M. Brown and R. P. Feynman, Phys. Rev. 85, 231 (1952).

3.      Both histograms on the slide 7  and 8 are for Δk. You applied cut for Δk on slide 7 while you extracted yield from Δk on slide 8.  Can you tell me if the definitions of those Δk are the same? If not, please clearly define and distinguish them.

4.      For those yield extraction figures on slide 8 & 9, it is hard to see how good the fitting are.  Can you plot them in log scale?

5.      For the “Experiment/Theory Deviation” slide  (the second slide 10), it is better for you to project  those data points to the y-axis and show the mean value and RMS of the distributions.

6.      On slide 11, would you use red arrows to indicate where your actual cuts are? Your text font on the figures are too small to see. Can you make them larger?

7.      On slide 13, the column #2 shows that energy is 4.84 GeV. Does it correspond to one of your energy bin? What do you mean by “integrated cross section”? Do you mean that you integrated the total phase space or  the energy range of the measurement?

8.      On slide  14, you need make statement. For example, you can say “The Compton cross sections for the energy range of 4.4-5.3 GeV were measured with precision of …   for the first time”, “The Compton results validated that the systematic uncertainties of the PrimEx-II experiment for the pi0 lifetime measurement were controlled at the level of  ***%”.



I would appreciate if you could send out your updated version as soon as possible.



Liping




From: li ye [mailto:yeli.ciae at gmail.com]
Sent: Saturday, April 07, 2018 1:48 PM
To: primex2 <primex2 at jlab.org>; Ashot Gasparian <gasparan at jlab.org>; pawel <pawel at jlab.org>; Gan, Liping <ganl at uncw.edu>; Ilia Larin <ilarin at jlab.org>; Dipangkar Dutta <ddutta07 at gmail.com>
Subject: APS April Meeting slides Compton

Hi All,
Here is the slides for APS meeting, please send me your comments.
Thanks
Li

--
Li Ye
Mississippi State University
757-291-9896
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