[Clascomment] OPT-IN: Semi-Inclusive pi0 target and beam-target asymmetries from 6 GeV electron scattering with CLAS

[Daniel Carman]

Keith et al.,

I have read through the draft of your new pi0 SSA/DSA paper. Below are my 
comments from reading through the manuscript. I am not an expert on this
physics and cannot add much regarding your results or their interpretation.
However, I provide what I did find. Let me know if you have any questions.


					        Regards,
						
						Daniel

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Page 1:
 - Line 27. Use "... found in the quark and gluon orbital angular momenta.".
 - Line 46. Use "... momentum fraction $x$ and ...".
 - Line 62. Use "... referred to as the Sivers [4] ...".
 - Line 69. Use "... [6] that describe various ...".
 - Line 78. Use "... simple $S$-wave ...".

Page 2:
 - Right Column
   - Line 3. Use "... left-hand side of ...".
   - Line 5. Use "... right-hand side of ...".
   - Eqs.(1) and (2). You have not defined the superscripts on your asymmetry
     terms.
 - Line 160. Use "... Polarization [36]. The ...".
 - Line 161. Use "... $(17^\circ < \theta < 50^\circ)$ ...".

Page 3:
 - Line 176. I suggest "... of the EC where there was a higher negative pion
     contamination ...".
 - Line 196. Use "kinematically dependent".
 - Line 198. Use "cross section".
 - Line 205. Use "... subtractions, and radiative ...".
 - Line 210. Use "Monte Carlo simulation".
 - Line 211. Use "... on the moment extraction, ...".
 - Line 216. Use "... evaluated the spin-dependent ...".
 - Figs. 1,2,3. Be consistent in caption with "vs." or "versus".
 - Figs. 1,2,3. I prefer "systematic uncertainties".
 - Line 222. I think a reference would be appropriate to the "equivalent radiator
    approximation.
 - Line 222. Use "We used fits to the world data on the ...".
 - Line 224. Use "... evaluated the radiative ...".
 - Line 236. I suggest "... $P_T$-dependence is less well described.".
 - Line 240. Use "... of the polarized quarks.".
 - Line 241. Typo on "helicity".

Page 4:
 - Why no theory curve on AUL vs. PT in Fig. 2?
 - Line 247. Use "... [30], indicate ...".
 - Line 258,261. Should these not both be "$\sin \phi_h$"?
 - Line 270. Use "... Fig. 3) ...".
 - Fig. 3 caption. Line 2. Use "... [16] and the solid triangles ...".

References:
 - Do not include preprint numbers for papers that have a complete journal reference.
 - Line 308. Spacing issue with this part of the reference.
 - Line 369. The CLAS NIM paper is not a CLAS Collaboration publication.
 - Line 382. Typo on "Unpublished".