[Clascomment] OPT-IN:Photoproduction of K+ K- meson pairs on the proton
Daniel Carman
carman at jlab.org
Mon Apr 2 08:29:13 EDT 2018
Dear Marco et al.,
I have read through your draft of the KK paper and include my comments below.
Most of what I have provided below will serve to improve the grammar and
readability of the paper. If you have any questions, let me know.
Regards,
Daniel
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General:
- Units. You are not consistent with your speed of light units in this manuscript.
For ease of presentation I recommend that you choose a convention that
presents masses in GeV and momentum-transfer squared in GeV$^2$ units.
- You are not consistent in your invariant mass notation. I would prefer that you
use "$M_{K^+K^-}$" throughout instead of "$M_{KK}$". However, there was
also alternative notation used of "$M_{K\bar{K}}$".
- You are not consistent with your use of hyphens in this manuscript. Better to
leave them out than to use them inconsistently.
- You are not consistent with your usage of "Figure" and "Fig.". I would suggest
that you use "Fig." in the text. The only exception being that to start a paragraph
you should use "Figure".
- You use color figures, but figures 18, 19, 20 are not readable in black and white.
Page 1:
- Title: Use "$K^+K^-$".
- Abstract:
- Line 4. Use "$K^+$.
- Line 5. Use "$K^-$.
- Line 9. Use "This is the first time ...".
- Left column:
- Paragraph 1:
- Line 5. Use "... probes and, in particular, with ...".
- Line 6. Use "The main reason for this is ...".
- Line 10. Use "... high-intensity and high-quality ...".
- Line 12. Use "... accumulated by the CB-ELSA ...".
- Line 13. Use "... while at higher energies, ...".
- Line 16. Use "... two new programs, GLUEX ...".
- Line 19. Use "... spectroscopy, has tens of thousands ...".
- Line 20. Use "... of events, and only a few ...".
- Right column:
- Paragraph 1:
- Line 8. Use "Both the two pion and two kaon decay modes couple ...".
- Line 10. Use "... isoscalar-scalar channel, which contains ...".
- Line 13. Use "meson, which is now well established [11-13], but does ...".
- Line 17. Use "These states have been the subject ...".
- Paragraph 2:
- Line 7. Use "... resonance that decays to two kaons ...".
- Line 10. Use "... waves efficiently describes it. To describe the higher mass ...".
Page 2:
- Left column:
- Paragraph 2:
- Line 5. Use "... example, the interference between ...".
- Line 10. Use "... of two pion photoproduction to the ...".
- Line 11. Use "... to those works for a ...".
- Paragraph 3:
- Line 1. Use "This paper is organized ...".
- Line 3. Use "Extraction of the angular moments ...".
- Line 4. Use "... two-kaon system is ...".
- Line 6. Use "... Section IV, where we also ...".
- Line 7. Use "... including the extracted differential cross sections for ...".
- Right column:
- Paragraph 2:
- Line 9. Use "... charged hadron identification [25]."
- Line 11. Use "This was made of 24 ...".
- Line 14. Use "The average time resolution of the ST strips was $\sim$300~ps.".
- Paragraph 3:
- Line 1. Use "... $\sigma_p/p$, ranged from ...".
- Line 4. Use "... region was about 40\%. It was somewhat ...".
- Line 5. Use "... which could be lost ...".
- Line 6. Use "... their paths were bent toward ...".
- Paragraph 4:
- Line 3. Use "... of the detected particles.".
- Line 6. Use "... of the drift chamber positions, ...".
- Paragraph 5:
- Line 6. Use "... TOF information allowed for the identification of the kaon band ...".
Page 3:
- Left column:
- Fig. 1 caption. Describe the shaded region.
- Paragraph 1:
- Line 2. Use "This cuts kept the contamination ...".
- Line 4. Use "($\sim$7\%)".
- Line 8. Use "$K^+K^-$".
- Line 13. Use "$pK^$".
- Line 14. Use "$K^+K^-$"
- Line 15. Use "... that does not affect the results.".
- Paragraph 2:
- Line 14. Use "... that required the ...".
- Line 19. Use "... mass spectrum of the $pK^-$ ...".
- Paragraph 3:
- Line 1. Use "... dominates the $K^+K^-$ spectrum ...".
- Line 3. Use "... and the $K^+K^-$ spectrum ...".
- Right column:
- Fig. 2 caption.
- Line 1. Use "Invariant mass of the $pK^+$ system vs. invariant mass of the $K^+K^-$
system.".
- Line 3. Use "... around 1~GeV/c$^2$, while the $\Lambda(1520)$ ...".
- Paragraph 1:
- Line 2. Use "... GeV/c$^2$ was applied to avoid ...".
- Line 6. Use "$K^+K^-$".
- Paragraph 2:
- Line 3 after Eq. (1). Use "... between the target and the recoil proton, ...".
- Line 9 after Eq. (1). Use "$z$-axis".
Page 4:
- Left column:
- Paragraph 1:
- Line 6. Use "... or is model dependent, it is important ...".
- Paragraph 2:
- Line 3. Use "... basis functions, which were ...".
- Line 6. Use "... directly, while the second ...".
- Line 21. Use "... stability of the results for ...".
- Line 23. Use "... for the moment extractions are reported ...".
- Paragraph 3:
- Line 11. Spurious "GeV" at end of mass range.
- Line 15. Use "... statistical fluctuations of the data.".
- Right column:
- Paragraph 1:
- Line 4 after Eq. (2). Use "... the $a^{th}$ event (here the two kaon decay angles), ...".
- Eq. (3). End equation with a period.
- Line 3 after Eq. (3). Use "... events. The parameters were ...".
- Eq. (4). End equation with a period.
- Section III.C title. Use "Method comparisons and final results".
- Paragraph 3:
- Line 5. Use "$M_{KK} > 1.075$~GeV/c$^2$".
- Line 7. Use "... in proximity to the ...".
- Line 10. Use "... with the moment extractions.".
Pages 5,6:
- Fig. 3, 4, 5 captions.
- Line 1. Use "... angular distributions for 3.0 ...".
- Line 3. Use "... (blue). The error bars include ...".
Page 6:
- Right column:
- Paragraph 1:
- Line 2. Use "The total uncertainty $\delta Y_{final}$ in the final moments ...".
- Line 8. Use "... see Sec. II). Therefore, ".
- Line 7 after Eq. (8). Use "... is available in the Jefferson Lab ...".
- Paragraph 2:
- Line 2. Use "... meson was extracted by ...".
- Line 7. Use "... GeV/c$^2$ as $\langle \tilde{Y}_{00} \rangle$ is ...".
- Line 8. Use "The results are shown in ...".
- Line 9. Use "... binning of the various studies, ...".
- Paragraph 3:
- Line 5. Use "... how the partial waves ...".
- Paragraph 4:
- Eq. (9). End equation with a comma.
- Eq. (10). On the LHS the dominator in the brackets needs spaces between the value
and the units.
Page 7:
- Left column:
- Fig. 6. The black points are awfully hard to see buried under the blue points. Is there
not a way to make them more prominent?
- Fig. 6 caption:
- Line 1. Use "... cross sections for 3.0 ...".
- Line 3. Use "The cross section was calculated ...".
- Line 5. Use "The uncertainties include fit parameter uncertainties added in ...".
- Line 6. Use "... 10\% systematic uncertainty from ...".
- Paragraph 1:
- Eq. (12). End equation with a comma.
- Line 1 after Eq. (12). Use "... so that the moments, defined in Eq. (1), are given by,".
- Eq. (13). End equation with a comma.
- Line 5 after Eq. (13). Use "... between the moments derived ... and the partial wave ...".
- Line 6 after Eq. (13). Use "The fit minimized the ...".
- Line 7 after Eq. (13). Use "... the left side of Eq. (13) with ...".
- Line 8 after Eq. (13). Use "parametrization".
- Line 9 after Eq. (13). Use "... of moments was used to determine ...".
- Right column:
- Paragraph 1:
- Line 5. Use "... so the fitted amplitudes ...".
- Line 7. "... small in the mass range, ...". The text is not clear. The mass range of what
system?
- Line 9. Use "... K^-$ was then characterized ...".
- Line 10. Use "There were 8 amplitudes ...".
- Line 11. Use "... depending on the two spin ...".
- Line 13. Use "... there were 24 $P$-wave ...".
- Line 15. Use "... helicity was restricted ...".
- Line 21. Use "... that the dominant amplitudes ...".
- Eq. (14). End equation with a comma.
- Line 2 after Eq. (14). Use "... frame, we assumed ...".
- Line 3 after Eq. (15). Use "We introduced two ...".
- Eq. (18). End equation with a comma.
Page 8:
- Figs. 7 through 13. The shaded bands are too faint to be clearly seen.
- Figs 7 through 13 captions. I show my suggestions for Fig. 7, but the same comments
apply to the captions for Figs. 8 through 13.
- Use "Experiment moments $\langle Y_{LM} \rangle$ (red) for
$0.6 \le \vert t \vert \le 0.7$~GeV$^2$ for $L \le 2$ and $M \le 2$ together
with the moments derived from the fitted amplitudes (black), including the
$L$=0 and $L$=1 amplitudes in the fit. The shaded band indicates the
associated systematic uncertainty. ..."
- What is the solid line drawn on the plots? It is not mentioned in the caption.
- Left column:
- Paragraph 1:
- Line 3. Use ".... $S$-wave interference with the ...".
- Line 5. Use "non-vanishing".
- Line 6. Use "non-zero".
- Line 13. Begin the sentence "Without polarization ..." as a new paragraph.
- Line 23. Use "Details of the amplitude ...".
- Right column:
- Paragraph 1:
- Line 4. Use "... moment determined the smearing ...".
- Line 6. Use "This lead to a width ...".
- Line 7. Use "... c$^2$, which is compatible ...".
- Line 8. Use "We fit the moments ...".
- Line 12. Use "... account the uncertainty contributions ...".
- Line 14. Use "... sets of moments from methods M1 and M2 were individually ...".
- Line 16. Use "... were averaged, obtaining the ...".
- Line 22. Use "... was found not to be ...".
Page 9:
- Left column:
- Paragraph 1:
- Line 3. Use "... procedure could not always ...".
- Line 4. Use "pseudo-data".
- Paragraph 2:
- Line 1. Use "... of the $S$- and ...".
- Line 6. Use "parametrized".
- Line 7. Use "$t$-channel".
- Line 11. Use "... with photon helicity $\lambda_\gamma = 1$ ...".
- Line 12. Use "... corresponds to the no-helicity ...".
- Line 15. Use "... flip. The non-vanishing ...".
- Right column:
- Paragraph 1:
- Line 2. Use "... we have focused on describing ...".
- Paragraph 2:
- Line 2. Use "... we performed the fit ...".
- Line 3. Use "... we included $S$- ...".
- Line 5. Use "... amplitudes were excluded.".
- Line 6. Use "... configuration, we used Regge ...".
- Line 7. Use "Specifically, the parity ...".
- Line 9. Use "... factor of two, since ...".
- Line 11. Use "... we used the above Regge-constrained ...".
- Line 12. Use "... and added to them the nucleon helicity flip ...".
- Line 13. Spurious period after "amplitudes". Use "... we tested if ...".
- Line 16. Use "... to extract the nucleon flip ...".
- Line 17. Use "Specifically, we added two ...".
Page 10:
- Left column:
- Paragraph 1:
- Line 2. Use "We found that ...".
- Line 3. Use "... configurations gave similar ... in Figs. 7-13, we show ...".
- Line 6. Use "... a fit was first performed ...".
- Line 9. Use "... $P$-wave in this way, we ...".
- Line 10. Use "... and added the ...".
- Line 11. Use "As shown in Fig. 15, ...".
- Line 12. Use "... we found the nucleon flip ...".
- Paragraph 2:
- Line 3. Use "... obtained from the fits to the moments. The results are ...".
- Right column:
- Table I caption:
- Line 1. Use "Cross sections in nb obtained ...".
- Paragraph 1:
- Line 1. Use "... that the magnitudes ...".
- Section E heading title. Use "Uncertainty evaluation".
- Paragraph 2:
- Line 1. Use "The final uncertainty was ...".
- Line 2. Use "... statistical uncertainty of ...".
- Line 3. Use "... systematic uncertainty contributions: ..."
Page 11:
- Left column:
- Table II:
- Column headings: Use consistent number of significant figures for energy
- Caption:
- Line 2. Use "... of [33]. The results shown are integrated ...".
- Line 4. Use "... c$^2$ for $E_\gamma$ ...".
- Line 5. Use "... GeV$^2$ and $M_{K\bar{K}}$ in the range of ...".
- Paragraph 1:
- Line 2. Use "... associated with the ...".
- Line 3. Use "... 10\%. The central values and uncertainties for all of the ...".
- Right column:
- Paragraph 1:
- Line 2. Use "\gamma p \to p K^+ K^-$".
- Line 5. Use "... of the partial wave amplitudes ...".
- Line 12. Use "... have been parametrized using ...".
- Line 14. Use "... was parametrized by Pomeron exchange, while the ...".
- Line 18. Use "... of the emitted kaons.".
Page 12:
- Left column:
- Paragraph 1:
- Line 3. Use "$K^+K^-$".
- Paragraph 2:
- Line 13. Use "Contract No.".
- Right column:
- Appendix A title. Use "Systematic studies of the moment extraction".
- Paragraph 1:
- Line 3. Use "... GeV. The moments were more stable ...".
- Line 5. Use "However, the kaon-nucleon ...".
- Paragraph 2:
- Line 3. Use "Fig. 19 shows the fit results ...".
- Line 5. Use "... so the kinematical region with ...".
- Line 7. Use "Dalitz plots of the whole $pK^+K^-$ data set before ...".
Page 13:
- Left column:
- Paragraph 1:
- Line 2. Use "... $\phi$ mass were not affected ...".
- Paragraph 2:
- Line 2. Use "... intensity was parametrized by ... and the likelihood was maximized ...".
- Line 3. Use "$t$ bin".
- Line 4. Use "$\lambda_{max}$ was varied ...".
- Line 5. Use "The fits became unstable ...".
- Line 6. Use "... parameters increased to ...".
- Paragraph 3:
- Line 1. Use "... fit reproduced the main features ...".
- Line 3. Use "... compare the helicity angles ...".
- Line 4. Use "... in Figs. 21 and 22 ...".
- Line 5. Use "... results (plotting the average of methods ...".
- Right column:
- Paragraph 1:
- Line 6. Use "... that the reconstructed distributions ...".
- Line 7. Use "... better reproduce the data.".
- Paragraph 2:
- Line 9. Missing closing parenthesis.
- Line 10. Use "... be attributed to the CLAS ...".
- Line 12. Use "The accepted Monte Carlo events, ...".
- Line 13. Use "... from a flat phase-space distribution, also ...".
Page 14:
- Left column:
- Paragraph 1:
- Line 5. Use "... within one sigma, except ...".
- Appendix B title. Use "$K^+K^-$".
- Paragraph 2:
- Line 1. Use "We restricted our analysis ...".
- Paragraph 3:
- Line 1. Use "The $P$-waves were constructed ...".
- Line 4. Use "... which leads to an almost purely ...".
- Line 6. Use "... $K^+K^-$ effective ... is described by the relativistic ...".
- Right column:
- Eq. (B1). End equation with a comma.
- Two lines after Eq. (B1). Use "... into partial waves,".
- Eq. (B2). End equation with a comma.
- Eq. (B4). End equation with a period.
- Line 1 after Eq. (B4). Use "... data we multiplied each of these amplitudes by a ...".
- Eq. (B5). Where is the s dependence?
Page 15:
- Left column:
- Fig. 14:
- Shaded bands are hard to see.
- The y-axis labels on the bottom two plots are ill-positioned inside the boundary of the
figure.
- Caption:
- Line 1. Use "Magnitudes of the $S$ ...".
- Line 3. Use "... by fitting to the experimental ...".
- Paragraph 1:
- Line 3. Use "... The coefficients $a$, $b$, and $c$ were allowed ...".
- Right column:
- Paragraph 1:
- Line 1. "In the upper meson vertex ..". This statement is meaningless without reference
to a specific Feynman diagram.
- Line 2. Use "... exchange was used, allowing for ...".
- Line 5. Use "... meson, was used at the ...".
- Line 6. Use "Both the $\pi^+\pi^-$ and $K^+K^-$ channels were included ...".
- Line 8. Use "... by the $f_0(980)$ ...".
- Line 10. Use "... given in Eq. (B5), which contains three independent ...".
Page 16:
- Fig. 18 caption. Describe the different data sets in the caption.
Page 18:
- Fig. 21 caption.
- Line 1. Use "Comparison of helicity angles for $0.4 \le \vert t \vert \le 1.0$~GeV$^2$
in the $f_0(980)$ mass ...".
- Line 4. Use "... (bottom) for the measured data (black) and the results reconstructed
from the fit (purple) using $\lambda_{max}=4$.".
Page 19:
- Fig. 22 caption.
- Line 2. Use "... mass distributions for $0.4 \le \vert t \vert \le 1.0$~GeV$^2$
in the $f_0(980)$ mass ...".
- Line 5. Use "... GeV/c$^2$) for the measured data (black) and the results reconstructed
from the fit procedure (purple) using $\lambda_{max}=4$.".
References:
- Ref. [5] title. Use "$Q^2$".
- Ref. [34] is out of order. It should come just before Ref. [32].
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