OPT-IN:Measurement of the helicity asymmetry E for the vec(Î³)vec(p) â†’ pÏ€0 reaction in the resonance region

Sun Apr 2 15:05:55 EDT 2023

Dear Nick et al.,

Here are my comments on the "Measurement of the helicity asymmetry E
... in the resonance region" paper that is out for CLAS Collaboration
review.

First of all, congratulations on getting this measurement
made.   It is a long time in development, and you and the others have
succeeded in producing a well-presented and significant result.

I have just a few comments that are all related to the text, and not
anything to do with the analysis.

Line 36 & Ref. 1:  This seems to be an exceptionally weak way to start
off the list of references:  an article that does not exist yet.    I
would remove this (non) reference.

Line 62-65:  This sentence seems out of place and possibly
superfluous.   You say "different..." without comparing to anything.
Only in the next sentence do you mention the (so far unnamed) previous
measurement.   You sentence would be better placed in line 69:
"...world dataset.  Our extraction...".   On the other hand, you could
just remove your sentence without losing anything:  it is a nearly
content-free statement.

Line 101:  Use "uncertainties" instead of "errors"

Line 167:  You give a value for the electron beam polarization here,
but it seems unlikely that this is correct for both beam energy
periods.   Either give both values, or maybe just site some reasonable
average if they are similar.

Line 312:  Section III.A There is text in this section that is
redundant with what was already said in previous sections.   You could
reduce the reader's need for patience by streamlining some of the
discussion to say things only once, not two or three times.   I don't
want to get into specifics, but if you read the paper for the first
time it does come across as somewhat unnecessarily wordy.

Fig 2:  This figure is hopeless for publication as it stands.   The
labels must be much larger.   The usual AIP style guide, for instance,
specifies the minimum label size to be 2mm on the printed page.

Line 376:  remove "...in great detail".   That phrase makes it sound
like you are being excessively defensive.   Just say what you did and
let the reader decide.

Fig. 3 caption.   Missing a word near the end:  "...CBELSA data WERE
included..."

It would be nice if, as a CLAS paper, you could promote other previous
papers from CLAS that dwell on the E observable.   I'm not sure where
the ideal place is to insert such references.   But perhaps at the end
of line 70 you can add the sentence:

"The experimental method used in the present study was also different from
other helicity asymmetry measurements by our CLAS collaboration used to
investigate neutron observables \cite{PhysRevLett.118.242002,
PhysRevC.98.045205 }."  The full citations are below.

That is all for now, 
Cheers, 

Reinhard 

@article{PhysRevLett.118.242002,
  title = {Beam-Target Helicity Asymmetry for $\stackrel{\ensuremath{\rightarrow}}{\ensuremath{\gamma}}\stackrel{\ensuremath{\rightarrow}}{n}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ensuremath{-}}p$ in the ${N}^{*}$ Resonance Region},
  author = {Ho, D. and Peng, P. and Bass, C. and Collins, P. and D'Angelo, A. and Deur, A. and Fleming, J. and Hanretty, C. and Kageya, T. and Khandaker, M. and Klein, F. J. and Klempt, E. and Laine, V. and Lowry, M. M. and Lu, H. and Nepali, C. and Nikonov, V. A. and O'Connell, T. and Sandorfi, A. M. and Sarantsev, A. V. and Schumacher, R. A. and Strakovsky, I. I. and \ifmmode \check{S}\else \v{S}\fi{}varc, A. and Walford, N. K. and Wei, X. and Whisnant, C. S. and Workman, R. L. and Zonta, I. and Adhikari, K. P. and Adikaram, D. and Akbar, Z. and Amaryan, M. J. and Anefalos Pereira, S. and Avakian, H. and Ball, J. and Bashkanov, M. and Battaglieri, M. and Batourine, V. and Bedlinskiy, I. and Biselli, A. and Briscoe, W. J. and Burkert, V. D. and Carman, D. S. and Celentano, A. and Charles, G. and Chetry, T. and Ciullo, G. and Clark, L. and Colaneri, L. and Cole, P. L. and Contalbrigo, M. and Crede, V. and Dashyan, N. and De Sanctis, E. and De Vita, R. and Djalali, C. and Dupre, R. an
 d El Alaoui, A. and El Fassi, L. and Elouadrhiri, L. and Eugenio, P. and Fedotov, G. and Fegan, S. and Fersch, R. and Filippi, A. and Fradi, A. and Ghandilyan, Y. and Gilfoyle, G. P. and Girod, F. X. and Glazier, D. I. and Gleason, C. and Gohn, W. and Golovatch, E. and Gothe, R. W. and Griffioen, K. A. and Guidal, M. and Guo, L. and Hakobyan, H. and Harrison, N. and Hattawy, M. and Hicks, K. and Holtrop, M. and Hughes, S. M. and Ilieva, Y. and Ireland, D. G. and Ishkhanov, B. S. and Isupov, E. L. and Jenkins, D. and Jiang, H. and Jo, H. S. and Joo, K. and Joosten, S. and Keller, D. and Khachatryan, G. and Kim, A. and Kim, W. and Klein, A. and Kubarovsky, V. and Kuleshov, S. V. and Lanza, L. and Lenisa, P. and Livingston, K. and MacGregor, I. J. D. and Markov, N. and McKinnon, B. and Mineeva, T. and Mokeev, V. and Montgomery, R. A. and Movsisyan, A. and Munoz Camacho, C. and Murdoch, G. and Niccolai, S. and Niculescu, G. and Osipenko, M. and Paolone, M. and Paremuzyan, R. and Park, K
 . and Pasyuk, E. and Phelps, W. and Pogorelko, O. and Price, J. W. and Procureur, S. and Protopopescu, D. and Ripani, M. and Riser, D. and Ritchie, B. G. and Rizzo, A. and Rosner, G. and Sabati\'e, F. and Salgado, C. and Sharabian, Y. G. and Skorodumina, Iu. and Smith, G. D. and Sober, D. I. and Sokhan, D. and Sparveris, N. and Strauch, S. and Tian, Ye and Torayev, B. and Ungaro, M. and Voskanyan, H. and Voutier, E. and Watts, D. P. and Wood, M. H. and Zachariou, N. and Zhang, J. and Zhao, Z. W.},
  collaboration = {CLAS Collaboration},
  journal = {Phys. Rev. Lett.},
  volume = {118},
  issue = {24},
  pages = {242002},
  numpages = {6},
  year = {2017},
  month = {Jun},
  publisher = {American Physical Society},
  doi = {10.1103/PhysRevLett.118.242002},
  url = {https://link.aps.org/doi/10.1103/PhysRevLett.118.242002}
}

@article{PhysRevC.98.045205,
  title = {Beam-target helicity asymmetry $E$ in ${K}^{0}\mathrm{\ensuremath{\Lambda}}$ and ${K}^{0}{\mathrm{\ensuremath{\Sigma}}}^{0}$ photoproduction on the neutron},
  author = {Ho, D. H. and Schumacher, R. A. and D'Angelo, A. and Deur, A. and Fleming, J. and Hanretty, C. and Kageya, T. and Klein, F. J. and Klempt, E. and Lowry, M. M. and Lu, H. and Nikonov, V. A. and Peng, P. and Sandorfi, A. M. and Sarantsev, A. V. and Strakovsky, I. I. and Walford, N. K. and Wei, X. and Workman, R. L. and Adhikari, K. P. and Adhikari, S. and Adikaram, D. and Akbar, Z. and Ball, J. and Barion, L. and Bashkanov, M. and Bass, C. D. and Battaglieri, M. and Bedlinskiy, I. and Biselli, A. S. and Briscoe, W. J. and Boiarinov, S. and Burkert, V. D. and Cao, F. and Carman, D. S. and Celentano, A. and Chandavar, S. and Charles, G. and Chatagnon, P. and Chetry, T. and Ciullo, G. and Clary, B. A. and Cole, P. and Collins, P. and Contalbrigo, M. and Crede, V. and De Vita, R. and Defurne, M. and Diehl, S. and Djalali, C. and Dupre, R. and Egiyan, H. and Ehrhart, M. and El Alaoui, A. and El Fassi, L. and Eugenio, P. and Fedotov, G. and Fegan, S. and Fersch, R. and Filippi, A
 . and Fradi, A. and Ghandilyan, Y. and Giovanetti, K. L. and Girod, F. X. and Gohn, W. and Golovatch, E. and Gothe, R. W. and Griffioen, K. A. and Guidal, M. and Hafidi, K. and Hakobyan, H. and Harrison, N. and Hattawy, M. and Heddle, D. and Hicks, K. and Holtrop, M. and Ilieva, Y. and Ireland, D. G. and Ishkhanov, B. S. and Isupov, E. L. and Jenkins, D. and Jo, H. S. and Johnston, S. and Kabir, M. L. and Keller, D. and Khachatryan, G. and Khachatryan, M. and Khandaker, M. and Kim, A. and Kim, W. and Klein, A. and Kubarovsky, V. and Laine, V. and Lanza, L. and Lenisa, P. and Livingston, K. and MacGregor, I. J. D. and Marchand, D. and Markov, N. and Mayer, M. and McKinnon, B. and Meyer, C. A. and Mirazita, M. and Mokeev, V. and Montgomery, R. A. and Movsisyan, A. and Munoz Camacho, C. and Nadel-Turonski, P. and Niccolai, S. and Niculescu, G. and O'Connell, T. and Osipenko, M. and Ostrovidov, A. I. and Paolone, M. and Paremuzyan, R. and Park, K. and Pasyuk, E. and Pogorelko, O. and Pr
 ice, J. W. and Prok, Y. and Protopopescu, D. and Rehfuss, M. and Ripani, M. and Riser, D. and Rizzo, A. and Rosner, G. and Sabati\'e, F. and Salgado, C. and Sharabian, Y. G. and Skorodumina, Iu. and Smith, G. D. and Sober, D. I. and Sokhan, D. and Sparveris, N. and Strauch, S. and Taiuti, M. and Tan, J. A. and Ungaro, M. and Voskanyan, H. and Voutier, E. and Wang, R. and Watts, D. P. and Weinstein, L. B. and Whisnant, C. S. and Wood, M. H. and Zachariou, N. and Zhang, J. and Zhao, Z. W. and Zonta, I.},
  collaboration = {The CLAS Collaboration},
  journal = {Phys. Rev. C},
  volume = {98},
  issue = {4},
  pages = {045205},
  numpages = {11},
  year = {2018},
  month = {Oct},
  publisher = {American Physical Society},
  doi = {10.1103/PhysRevC.98.045205},
  url = {https://link.aps.org/doi/10.1103/PhysRevC.98.045205}
}