OPT-IN: Differential cross sections and polarization observables from the CLAS Kâ photoproduction and search for new Nâ states

[Daniel Carman]

Ken et al.,

I have read through the draft of your K*+Lambda paper dated April 28. I include here
my comments. This was an interesting and enjoyable paper to read regarding the possible higher-mass N* contributions to this process. Let me know if you have any questions. 


					        Regards,
						
						Daniel

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General:
 - Use $K_S^0$ for your notation throughout.
 - Replace "error" and "errors" with "uncertainty" and "uncertainties".
 - You should use "$t$-channel$" and not "t-channel". Please make updates throughout.

Title:
 - I suggest a tweaks: "Differential cross sections and polarization observables from
   CLAS $K^{*+}$ photoproduction and the search for new $N^*$ states"

Page 1:
 - Left column:
   - Paragraph 1.
     - Line 12. Use "... number of missing resonances are expected.".
     - Line 22. Use "... resonances that may contribute ...".
 - Right column:
   - Paragraph 2.
     - Line 1. Use "The experiment was carried out using ...".

Page 2:
 - Left column:
   - Paragraph 1.
     - Line 5. Use "... one consisting of a series ...".
   - Paragraph 3.
     - Put a period at the end of Eq.(2).
   - Paragraph 4.
     - Line 2. Use "... events that are compatible ...".
     - Line 5. Use "... 1383~MeV and ...".
   - Fig. 4 caption.
     - Line 2. Use "... adapted from Ref. [4]).".
   - Suggestion: There is too much discussion on the 4 background subtraction procedures.
     It comes across as too much. I suggest that you present your final method and then
     briefly mention how the systematics were employed slightly varying the approach.
 - Right column:
   - Fig. 2:
     - I would like to see the angle ranges listed on each of the plots to make things
       clearer.
     - Why are the K* peaks for the two forward angle bins so distorted on the high-mas
       slide? Your fit function is a poor representation of the data here.
   - Paragraph 2.
     - This two sentence stand-alone paragraph likely is referring to your third method and 
       should be incorporated into the previous paragraph.
   - Paragraph 3.
     - Line 3. Use "... function with $M = 892$~MeV and ...".

Page 3:
 - Left column:
   - Paragraph 1.
     - Line 5 after Eq.(3). I suggest "... The function in Eq.(3) was ... with an event by ...".
   - Paragraph 2.
     - Line 1. Use "The $\Lambda$ recoil polarization $P$ is ...".
     - Line 11. Use "... elements in Figs. 3 and 4, and the $\Lambda$ ...".
   - Paragraph 4.
     - Line 7. Use "... base, which contains data ...".
 - Right column:
   - Paragraph 1.
     - Line 2. Provide a reference for SAID.
     - Line 4. Use "Those parameters that describe ...".
   - Paragraph 2.
     - Line 11. Use "... shown as the dashed ... in Figs. 3, 4 and 5.".
   - Paragraph 3.
     - Line 10. Use "... 2.05 for $d\sigma/d \cos \Theta (54 points) and ...".
   - Paragraph 5.
     - Line 2. Use "... Figs. 3, 4 and 5 ...".
     - Line 5. Use "... 38 data points, respectively.".

Page 4:
 - Fig. 3 caption.
   - Line 1. Use "... cross sections (top) and the $\rho_{00}$ density matrix elements (bottom) ...".
   - Line 2. Use "... online) curves are a fit in which ...". 
   - Line 4. Use "... 2.6~GeV, above which the curves represent a prediction.".

Page 5:
 - Fig. 4 caption.
   - Line 1. Use "(Color online) The $\rho_{10}$ (top) and $\rho_{11}$ (bottom) density ...".
   - Line 4. Use "... 2.6~GeV, above which the curves represent a prediction.".

Page 6:
 - Left column.
   - Fig. 5.
     - Are the panels bin-centered or bin-averaged? If they are bin-averaged, you should include the cos theta bin
       range on the plots.
     - Fig. 5 caption. Line 5. Use "... 2.6~GeV, above which the curves represent a prediction.".
   - Paragraph 2.
     - Line 9. Use "... and the masses and widths ...".
   - Table 2 is discussed before Table 1. Switch their order of appearance in the text.
 - Right column.
   - Paragraph 1.
     - Line 3. Use "... be determined, and hence no definite ...".
   - Paragraph 2.
     - Line 4. I suggest "... these resonances actually account for a larger number of resonances ...".
   - Paragraph 3.
     - Line 4. Use "... make up about 50\% ... section; $K^*$ exchange ...".

Page 7:
 - Left column.
   - Paragraph 1.
     - Line 1. Use "... range that is shown ...".
 - Right column.
   - Ref.[3] is not a CLAS Collaboration paper.
   - Ref.[13] Use "A.V. Anisovich {\it et al.}, ...".