[Clascomment] OPT-IN: Measurement of the neutron F2 structure function via spectator tagging

[Daniel Carman]

					Aug. 23, 2011


Dear Nathan et al.,

I have read through your BONUS F2n paper and pass along my comments
to you below. The paper was well written and I really don't have
too many comments. Good work. Let me know if you have any questions.


			   Regards,

				  Daniel

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Page 1.
  Right column.
    Paragraph 1.
      Line 1. Use "... the resonant and nonresonant contributions ...".
      Line 2. Use "... as well as to provide critical input ...".

Page 2.
  Right column.
    Paragraph 2.
      Line 17. Use "2~$\mu$s".
      Line 20. Use "... between the electron and proton vertices ...".
    Paragraph 3.
      Line 6. Confusing as written. Add a space between "$x_{min} =
        0.143 Q^2$" and "$(0.143 Q^2 - 0.03)$".
      Line 7. Confusing as written. Add a space between "$Q^2 < 3.6$"
        and "$(Q^2 > 3.6)$.
      Line 9. I suggest "... protons allowed them to be identified ...".

Page 3.
  Left column.
    Line 3 after eq.(3). Use "... largely cancel, as this enters ...".
  Right column.
    Line 11 after eq.(4). The sentence beginning "The final systematic
      errors ..." should start a new paragraph. Also, you state that there 
      is a systematic contribution included for uncertainties on F2d and 
      F2p and possible deviations on the L/T ratios but you never mention 
      the associated systematic value assigned like you do for the other
      sources. I think this would be relevant to include.
    Fig. 2. All I can see on my print out are your blue solid data
      points. The open circles are essentially invisible. This figure
      needs some improvement to make it readable.

Page 4.
  Left column.
    Paragraph 2.
      Line 6. Use "... underestimate the $F_2^n$ data, ...".
  Right column.
    Paragraph 2.
      Line 13. Use "... and will allow for direct tests ...".