[Clascomment] OPT-IN:Photoproduction of K+ K- meson pairs on the proton
Biplab Dey
biplabdey at yahoo.com
Thu Jun 21 12:42:01 EDT 2018
Dear Proponents,
I still get these emails, so couldn't help but read the paper draft out of interest. Of course we knew that there is some S-wave and probably should have put in an additional systematic for this. I have some observations on the draft:
-- it seems somewhat weird that the previous g11a phi CLAS paper comes in at Ref 31. I agree we didn't account for the S-wave, but many other things were done, including a full angular analysis. I think this reference should be in the introduction up front.
-- there should be some discussion on comparisons of the KK system obtained here in gp->KKp, vs, other processes. The main one is Bs->JpsiKK, where LHCb has beautiful measurements. From your Table, the S-wave fraction in the 1020\pm10 MeV window is around 2%. This might be compared with the ~1% observed in Bs->JpsiKK, as in Fig19:https://arxiv.org/abs/1302.1213More interestingly, what is the relative phase between the P- and S-wave? For the Kpi system under the K*(892), there was a pi shift between LASS (pK scattering) and BaBar (B0->JpsiKpi). This tells us that the strong phase is process dependent.
-- there seems to be a discrepancy between the previous CLAS measurement and this work in Fig 6, beyond a couple % S-wave. The text says, the comparison is ``reasonable'', which is far-fetched, from looking at the figure. I note that a crucial check for the previous paper was the charged/neutral mode comparisons -- totally different acceptances. Do you have a different normalization?
Best regards,-Biplab
On Thursday, June 21, 2018, 6:03:35 PM GMT+2, Marco Battaglieri <battaglieri at ge.infn.it> wrote:
Dear Dan,
thanks a lot for your detailed comments/edits/corrections that have been
incorporated in the new version of the draft posted on the review page
https://www.jlab.org/Hall-B/shifts/admin/paper_reviews/2018/twok_prd_v6-3022110-2018-06-21-v6.pdf
We preferred to not modify the lines/shadow-area in the figures since
they were already modified according the last round of comments
exchanged with the review committee. We'll wait for the paper (PRD)
requests (if any) to change the style.
Best regards
Marco (on behalf of the main authors)
Daniel Carman wrote:
> 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
> ---------------------------------------------------------------------------
> 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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