[Clascomment] OPT-IN: Measurement of Single and Double Spin Asymmetries in Deep Inelastic Pion Electroproduction with Longitudinally Polarized Target

[Daniel Carman]

						February 2, 2010


Dear Harut et al.,

I have read through your SIDIS paper and my comments are given below.  My 
references will refer to the page numbers and paragraphs of the version 
of the paper dated Jan. 22. Let me know if you have any questions or 
need any clarification.

I do not have too much to add in the way of physics comments as I am far
from an expert in the SIDIS field. My comments will therefore focus mainly
on grammar and style. Let me know if you have any questions.


				      Regards,

				      Daniel

*************************************************************************

General:
 > On all figures, Use FIG. #: (Color online). ...\".
 > Capitalize \"Collaboration\" in the text.

Page 1:
  Title. Use \"... with a Longitudinally Polarized ...\".
  Left Column.
    Paragraph 1.
      Line 1. Use \"final-state hadrons\".
      Line 3. How about \"... (SIDIS) $\\vec{e} p \\to e\' h X$, for which ...\"?
      Line 5. Is your statement \"which are not accessible in inclusive
         scattering\" obvious? How about a reference or statement?
    Paragraph 2.
      Line 3. Use \"... provide access to the transverse ...\".
      Line 5. Is your statement \"The Pt dependence of the double-spin
         asymmetry also probes the transition ...\" obvious? How about a
         reference? Also, you have not defined what double-spin asymmetry
         you are referring to.
      Line 8. Use \"... Q$), the double-spin asymmetry ...\".
    Paragraph 4.
      Line 7. Use \"... for a longitudinally polarized beam ...\".
  Right Column.
    Paragraph 1.
      Line 6. Use \"... energy of the virtual ...\".
      Line 7. Use \"... z$), it involves ...\".
      Line 15. Use \"... in leading order is defined by ...\".
      Line 16. Use \"... where $P_T$ is the transverse ...\".
    Paragraph 2.
      Line 4. I suggest \"First calculations for $h_{1L}^\\perp(x,k_T)$ have
        recently been performed in the perturbative limit [27], and first
        measurements ... on the lattice.\".
    Paragraph 3.
      Line 6. Use \"Higher-twist observables\".
      Line 8. Use \"higher-twist effects\".
      Line 9. Use \"... of the average transverse force ...\".

Page 2:
  Left Column.
    Paragraph 2.
      Line 1. Use \"... of the kinematic dependences ...\".
      Line 10. Use \"... using an incident 5-nA beam ...\".
      Line 11. Use \"... and an average beam ...\".
      Line 21. You are not consistent with usage of c units. I suggest you
        let c=1 in this paper for less awkward and consistent usage.
      Line 22. Use \"0.1 - 0.9\".
      Line 23. Use \"0 - 2$\\pi$\".
      Line 29. Use \"$\\rho$\".
    Paragraph 3.
      Line 1. Remove comma after \"asymmetry\".
      Eq.(1). Add comma at end of equation.
      Line 2 after Eq.(1). Use \"\\nu/E$, and $N^\\pm$ are luminosity-weighted
        counts ...\".
      Eq.(2). Add period at end of equation.
    Paragraph 4.
      Line 1. Use \"systematic uncertainties\".
  Right Column.
    Fig. 1 caption.
      Line 1. Use \"double-spin\". Check hyphenation of \"double-spin asymmetry\"
        throughout paper.
    Paragraph 1.
      Line 5. Use \"statistical uncertainties\".
      Line 7. Use \'leading-order\".
    Paragraph 2.
      Line 4. Use \"agreement, indicating ...\".
    Paragraph 3.
      Line 1. Use \"$A_1$ is shown in Fig. 2 ...\".
    Paragraph 4.
      Line 2. Use \"... widths of the ...\".
      Line 4. Use \"polarizations\".
      Line 6. Use \"... of the proton spin ...\".

Page 3:
  Left Column.
    End Eq.(3) with a period.
    Paragraph 2.
      Line 1. Use \"... extraction of the different moments ...\".
      Line 5. Use \"... and, alternatively, for ...\".
      Line 9. Use \"... systematic uncertainties in the measurements ...\".
  Right Column.
    Fig. 3 caption.
      Line 1. Use \"spin-dependent\".
      Line 2. Use \"... over the full kinematic ...\".
      Line 7. Use \"... moments, and the solid line shows ...\".
    Paragraph 1.
      Line 1. Use \"spin-dependent\".
      Line 6. Use \"... contribution to the ..\".
      Line 15. Use \"... SSA, in general, is relatively ...\".
    Paragraph 2.
      Line 5. Use \"yellow/filled bands\"
    Paragraph 3.
      Line 2. Use \"$u$-quarks\".