OPT-IN: The Beam-Target E asymmetry for vec gamma vec n -> pi- p in the Nâ resonance region

[Barry Ritchie]

Great to see this coming out. I have the following comments after a quick read-through:

0. Since Patrick Collins was also supported by ASU during 2016, perhaps Arizona State University, Tempe AZ 85287-1504 should be added to his address superscript. 

1. Only the first word of the title should be capitalized: "The beam-target asymmetry $E$..."

2. In the second line of the abstract, W should be italicized.

3. On page 2, please cite the tagger NIM article: D. I. Sober et al. Nucl. Instrum. Meth. Phys. Res. A 440, 263-284 (2000). 

4. On page 3, please add "with |P_{miss}| \leq 0.1 GeV/c" to the caption of Fig. 2. You should also indicate what uncertainty is represented by the error bar in that figure. 

5. On page 3, second paragraph, there is an extra "the" that should be removed : "reproduces the observed the..."

6. Why is the photon beam polarization uncertainty so large (given as 3.4%)? With Ref. 12, most of this uncertainty likely comes from the Moeller measurement, right? Then that photon beam polarization uncertain seems quite high for a Moeller measurement uncertainty for any reasonable period of time. Is that a typo?

7. On page 4, I would suggest substituting "very discordant" perhaps for the words "wildly disparate". At any rate, "disparate" is not really the word you want here. 

---BGR