OPT-IN:Target and Double Spin Asymmetries of Deeply Virtual Ï0 Production with a Longitudinally Polarized Proton Target and CLAS

[Daniel Carman]

Andrey et al.,

I have read through the draft of your DVMP target and double spin asymmetry paper and
include my comments below. Let me know if you have any questions.


					        Regards,
						
						Daniel

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Page 1:
 Abstract:
  - Line 8. Use "... over a large kinematic ...".
  - Line 12. Use "... parton distributions (GPDs) provides the first insight on the
      chiral-odd GPDs $\tilde{H}_T$ and $E_T$, and complement ...".
  - Line 14. Use "... for chiral-odd GPD parameterizations and will ...".
 - Line 18. Use "... that allows for the description of the angular ...".
 - Line 23. Use "... partons, rendering a ...".
 - Line 26. Use "... provide insight into ...".
 - Line 31. You have defined H, E, H-tilde, and E-tilde, but you have not defined E-bar.
 - Line 48. Use "... chiral-odd GPD parameterizations ...".
 - Line 50. Use "... calculations into agreement ...".
 - Line 51. Use "... unpolarized cross section measurements.".
 - Line 54. Use "... $\pi^0$ production have been obtained ...".
 - Line 55. Use "... Hall A Collaborations ...".
 - Line 56. Use "... on a longitudinally polarized ...".
 - Line 58. Use "... double spin asymmetries for deeply virtual $\pi^0$ production.".
 - Line 62. Use "... and the unpolarized cross section, ...".
 - Eq.(1). Put a comma after the equation for proper punctuation.
 - Line 73. Use proper opening quotations on "generic". Also use "... GPD and ${\cal{H}}$ is ...".
 - Eq.(3). Put a comma after the equation for proper punctuation.
 - Line 79. Use "... index $L$ for the target polarization and ...".

Page 2:
 - Line 87. Use "... contributing GPD convolutions ...".
 - Line 99. Use "... chiral-even GPD compositions ...".
 - Line 100. Use "... $A_{LL}^{\cos \phi}$ term is sensitive ...".
 - Line 102. Use "... $A_{UL}^{\sin 2\phi}$ term is determined ...".
 - Line 107. Use "... using CLAS [13], ...".
 - Line 119. Use "... using a $^{12}$C target ...".
 - Line 125. Use "... the same CLAS sector of the ...".
 - Line 127. Use "... counter. The cuts on EC ...".
 - Line 131. Use "... magnet, passing through the ...".
 - Line 134. Use "... (IC), which was installed ...".
 - Fig.1 caption.
   - Line 2. Remove primes on $e$ and $p$ in the reaction as you do not use this notation elsewhere.
   - Line 3. Use "... (b) the exclusivity cuts are ...".
 - Line 138. Use "... in the IC and for ...".
 - Line 142. Use "... and energy and momentum conservation can be used ...".
 - Line 144. Use "... allow for the rejection of events ...".
 - Line 146. Use "e.g.".
 - Line 149. Use "... in the IC ... in the EC ... in the IC and another in the EC.".
 - Line 151. Use "... of the kinematic quantities ... topologies were different ...".
 - Line 152. Use "... resolution, and thus the {\em exclusivity cuts} ...".
 - Line 154. Use "... of the events from ...".
 - Line 161. Use "... for the EC-EC, IC-IC, and EC-IC topologies, respectively, ...".
 - Line 162. Use "... is the angle between the measured ...".
 - Line 164. Use "... in the $ep \to epX$ system.".
 - Line 165. Use "... effect of the exclusivity cuts ...".
 - Line 166. Use "... mass of the $ep$ system ...".

Page 3:
 - Fig.2 caption.
   - Line 2. Use "... for the three different ...".
   - Line 3. Use "... cyan areas represent ...".
   - Line 5. Use "... show the factors used to scale ... in the histograms to ...".
 - Line 178. Use "... is visible in Fig. 2 under ...".
 - Line 181. Use "... of the $M_{\gamma\gamma}$ ...".
 - Line 184. Use "... account any asymmetrical ...".
 - Line 186. Use "... that the selected events were ...".
 - Line 187. Use "... regime, the kinematic ...".
 - Line 194. Use "... as follows:"
 - Eq.5. Put a comma after the equation for proper punctuation.
 - Line 198. Use "... photon detection topology, ...".
 - Line 200. Use "... for the positive/negative ...".
 - Line 215. Use "... 2.5$\sigma$ to 3.5$\sigma$, ...".
 - Line 216. Use "re-analyzed".
 - Line 218. Use "... 4.4% on average.".
 - Line 219. Use "... subtraction procedure accounted for a systematic ...".
 - Line 220. Use "... of the beam and the target polarizations, and the dilution factor, lead
       to a global normalization uncertainty, and contribute less than 3\%.".
 - Line 226. Use "... statistical uncertainties ...".
 - Line 227. Use "... spin asymmetries for ...".
 - Line 229. Use "... 0.6, and ...".
 - Line 232. Use "... nucleon, and $p$ and ...".
 - Line 235. Use "... as a function of $\phi$ in Fig. 3.".
 - Line 237. Use "... azimuthal dependence for the target spin asymmetries ...".
 - Line 238. Use "... amplitudes of the $\sin \phi$ ...".
 - Line 239. Use "... for the double spin ...".
 - Line 243. Use "... in Eqs. 2 and 3 ...".
 - Line 246. Use "... because $A_{UU}^{\cos \phi}$ is ...".
 - Line 249. Use "... asymmetries, and is important in ...".
 - Line 254. Use "... with an unpolarized ...".

Page 4:
 - Line 256. Use "In Fig. 4 ...".
 - Line 263. Use "... in the GPD parameterization ...".
 - Line 264. Use "... methods. GGL provides the chiral-odd GPD ..."
 - Line 267. Use "This approach allows the model to overcome ...".
 - Line 278. Use "... with the GGL model but less with the GK model ...".
 - Line 279. Use "The $A_{LL}^{const}$ and ...".
 - Line 283. Use "... because the chiral-even ...".
 - Fig.3 caption.
   - Line 2. Use "... spin asymmetries for ...".
   - Line 4. Use "... (columns) and $-t$ range (rows). ...".
   - Line 5. Use "... in the text.".
 - Fig.4 caption.
   - Line 3. Use "... in the $(Q^2,x_B)$ plane ...".
   - Line 4. Use "... represent the systematic uncertainties, and the ...".
   - Line 5. Use "... from two GPD models: ...".
   - Line 6. Use "... Note that the $A_{UL}^{\sin 2 \phi}$ moment is zero in the GK ...".
 - Line 289. Use "... exhibits a relatively flat ...".
 - Line 291. Use "... of the beam-spin asymmetry ...".
 - Line 292. Use "... larger magnitude.".
 - Line 293. Use "... but the target spin asymmetry ...".
 - Line 294. Use "... and the beam spin asymmetry ...".
 - Line 296. Use "... for $A_{LL}^{const}$, which contains ...".
 - Line 297. Use "... chiral-odd GPD contributions. Its $-t$ behavior is ...".
 - Line 298. Use "... dominated by $<H_T>$ at low $-t$ and by ...".
 - Line 301. Use "... $A_{LL}^{const}$ near threshold ...".
 - Line 306. Use "... of the chiral-even and chiral-odd GPD product ...".
 - Line 308. Use "... product whose imaginary part describes the ...".
 - Line 310. Use "... demonstrates a promising new ...".

Page 5:
 - Line 323. Use "... structure function measurements ...".
 - Line 326. Use "... GPD parameterizations.".
 - Line 335. Use "... Council. Jefferson Science Associates ...".
 - Refs.[8],[9],[10]. Add "(CLAS Collaboration)" to the author list as these are Collaboration
     publications.
 - Ref.[13]. Use "B.A. Mecking".