[Clascomment] OPT-IN:Differential cross section and recoil polarization measurements for the gamma p --> K+ Lambda reaction using CLAS at Jefferson Lab

[Daniel Carman]

Dear Mike et al,

I have read through your manuscript draft K+Lambda photoproduction
dated Nov. 9, 2009 and have a number of comments. I present them in 
the order that I found them, making no attempt to separate physics 
comments from grammar/style comments. Please let me know if you have 
any questions on what I have included.

I was very happy to read this paper as I know how long a path it has
been to get to this point. You all did a fine job and the paper seems
to me to be in very good shape. I fully support your statements on the
remaining discrepancies between this data and the Bradford data given
what we know now.

				Regards,

				   Daniel

**********************************************************************
General: 
  - Use \"e.g.\" and \"i.e.\" throughout. You typically have \"e. g.\" and 
    \"i. e.\". I believe the preferred format is roman font too.
  - Use \"vs.\" and not \"vs\" throughout.

Page 1. 
  Left column.
    Paragraph 2. 
      - Line 1. Spurious \"the\" at end of line.
      - You mention nowhere in this paper the cross section data of McNabb.
        While I understand that Bradford\'s work superceded this, I should
        think that it deserves reference and mention as to its status.
      - Line 9. \"incomparable\" is an awkward choice. Of course I can compare
        the size of the two data sets. Just say \"order of magnitude larger\".
    Paragraph 3.
      - Line 2. Use \"... of the $N^*$ contributions ...\".

Page 2.
  Left column.
    Paragraph 1.
      - Line 1. Use \"... at the Thomas Jefferson ...\".
      - Line 13. I suggest \"... in diameter, filled with liquid ...\".
    Paragraph 2.
      - Last line. I prefer \"... in Ref.[12].\".
  Right column.

Page 3.
  Left column.
    Paragraph 1.
      Line 3. Use \"... a kinematic fit, considering ...\".
      Line 7. Use \"positively charged\".
    Paragraph 2.
      Line 7 after Eq.(1). Use \"... masses appropriate for the ...\".
  Right column.
    Paragraph 2.
      Eq.(2). Use units with c=1 to be consistent with usage elsewhere.
      Line 2 after Eq.(2). Need reference for Feldman-Cousins method.
    Paragraph 3.
      Line 3. Use \"... in Ref.[17].\".
      Line 13. I suggest \"... to the $K^+$ missing mass values for ...\".
      Line 2 after Eq.(3). Use \"... bin is shown in Fig. 2.\".
    Paragraph 4.
      Line 4. Use \"... according to a phase-space ...\".
      Line 5. Use \"distribution\".

Page 4.
  Fig. 1 caption. Line 1. Use \"... in the three-track data ...\".
  Fig. 2 caption. I suggest \"... show the $K^+$ missing mass
    distributions for ...\".
  Left column.
    Line 5. Use \"... found in Ref.[16].\".
    Line 9. Use \"... work in Ref.[13].\".
  Right column.
    Eq.(4). You did not describe the sum over P.

Page 5.
  Left column.
    Section VI. Line 3. Use \"... in Ref.[13].\".

Page 6.
  Left column.
    Section VII.
      Line 12. Use \"... in Ref.[15].\".
  Right column.
    Section IX.
      Line 7. Add a space after \"\\sqrt{s},\".

Page 7.
  Right column.
    Line 3. I prefer \"The statistical uncertainty ...\".
  Last paragraph.
    Line 2. Use \"... bins, but slight ...\".

Page 11.
  Right column.
    Paragraph 1.
      Line 1. Use \"the $\\d\\sigma /d \\cos \\theta_K^{c.m.}$ data.\".
    Paragraph 2.
      Line 3. Use \"... shows the mean results ...\".
      Line 12. Use \"... hinted at by previous ...\".
    Paragraph 3.
      Line 11. Use \"... but its magnitude ...\".
    Second line from bottom.
      Use \"... state included to account for the enhancement ...\".

Page 14.
  Left column.
    Line 3. Use \"It is worth noting that ...\".
  Right column.
    Line 3. Use \"... observables that present ...\".
    Ack. Line 1. Use \"... administration of the ...\".

References.
  - Put references in the order cited in the text.
  - Style problems.
    - No comma after author and before et al. (Check usage throughout paper.)
    - [15] archive is incomplete.
    - [16] formatting problems causing s p a   c i n   g issues.
    - [22] Use \"..., and T. Van Cauteren ...\".
    - Go through references and check punctuation. Several problems.