Paper Review: 2012 Lambda D_TT @200GeV
Updated on Thu, 2018-05-24 04:26. Originally created by jcmei on 2018-03-19 03:18.
Here are the paper review history for 2012 Lambda D_TT @200GeV
The reviews are listed here as the time line.
Part I: PWGC review
1. Paper draft version 3.1
One big update in the new version is the application of cross-ratio method (thanks Carl and other colleagues):
1. Paper draft version 5.6
This is the first version discussed in GPC and generally it has been a good shape. We update it to version 6.1 following suggestions on figure styles and sentences. A brief list of key update:
1) Fig. 4: the error box for systematic uncertainty changed to open box.
2) Eq. 3: we prefer not to add ^raw(cosin_theta*) in the sense to show the general equation to extract D_TT . Fig. 3 was added "raw" as suggested.
3) Added definition for N(sigma) and one reference accordingly in the caption of Tab.1
4) The sentence around Line 404-408 is updated accordingly.
The reply of the comments and questions based on version 5.6 are shown here.
Q1: Line 122: why surprising?
A1: We mean the measurement results are not expected.
Q2: Line 155: why not use p^p^?
A2: As to measure spin transfer, only one beam needs to be polarized.
Q3: Line 171: why not use alpha_anti-Lambda = -0.71 +- 0.08 ?
A3: We choose not to use direct data on alpha for anti-Lambda (-0.71 +- 0.08) due to larger error, but rather take the CP conservation as tested in PDG with much better precision.
Q4: Line 241: distance -> angle?
A4: We think angle here is not precise what we mean. Now changed to "radius".
Q5: Line 381: Only positive eta?
A5: Here does mean the positive eta range only.
2. Paper draft version 6.1
The reviews are listed here as the time line.
Part I: PWGC review
1. Paper draft version 3.1
This version is the starting point. It is written before the cross-ratio method was used in the analysis.
- Fig. 3 & 4 were replaced with new results. The systematic errors in Fig. 4 are significantly improved after removing contribution from luminosities.
- updated Eq. (3) and the whole paragraph around it, and next paragraph.
- paragraph on systematic uncertainty was updated, together with revision of other sentences.
- D_TT values in abstract and summary, were also updated.
- Here are answers to Oleg's some other questions/comments to version 3.1:
Q1: How is this related to D_TT? I have not yet checked the E704 paper, but is there a reference to the chosen formalism/convention that you can cite?
A1: D_NN is the transverse spin transfer alone the normal direction of the Lambda production plane, so beam polarisation is also required to be projected to this normal direction. D_TT is the full spin transfer with rotation considered, not used for this sense before.
Q2: Wasn't there a table with the cuts? Or am I confusing this with the D_LL analysis? It's also not entirely clear what was done here. Did you find the figure of merit? Or just push the background to below 10%?
A2: Yes, we put the cuts and counts in one table now. The cuts were pushed to keep the background <10%. Significance study was once done for D_LL, and D_TT (partial statistics), for cuts study. The current one is a good choice, and possible difference is very small.
Q3: Is this correlation only done for the two leading jets? Is there a momentum or energy threshold for the jet?
A3: All the reconstructed jets with pT larger than 5 GeV/c to make the correlation, as jets axis (substitute of parton) is used to get the rotation angle in determining cosin_theta*.
Q4: Does that mean that the distribution indeed looks similar (Fig.2) ?
A4: The cos^{theta*} vs. the invariant mass distributions for Lambda and anti-Lambda really look similar. Both plots are shown in analysis note (Figure 4.1)
Q5: The dominant systematic is the relative luminosity here. Why is this so large btw? And they are fully correlated among all points and should be indicated separately.
A5: It is large because no scalers were saved for transverse spin runs, so non-Lambda events were used to calculate relative luminosity. Now cross-ratio method was applied,and luminosity dependence was removed, thus no this part systematic any more.
Q6: I would describe the detector components first and then move on to the trigger.
A6: Done
Q7: Does this take into account the systematic uncertainty and all correlations?
A7: Now the Chi2 values are also updated with updated D_TT, 9.5/6, with systematic errors included.
1. Paper draft version 5.6
This is the first version discussed in GPC and generally it has been a good shape. We update it to version 6.1 following suggestions on figure styles and sentences. A brief list of key update:
1) Fig. 4: the error box for systematic uncertainty changed to open box.
2) Eq. 3: we prefer not to add ^raw(cosin_theta*) in the sense to show the general equation to extract D_TT . Fig. 3 was added "raw" as suggested.
3) Added definition for N(sigma) and one reference accordingly in the caption of Tab.1
4) The sentence around Line 404-408 is updated accordingly.
The reply of the comments and questions based on version 5.6 are shown here.
Q1: Line 122: why surprising?
A1: We mean the measurement results are not expected.
Q2: Line 155: why not use p^p^?
A2: As to measure spin transfer, only one beam needs to be polarized.
Q3: Line 171: why not use alpha_anti-Lambda = -0.71 +- 0.08 ?
A3: We choose not to use direct data on alpha for anti-Lambda (-0.71 +- 0.08) due to larger error, but rather take the CP conservation as tested in PDG with much better precision.
Q4: Line 241: distance -> angle?
A4: We think angle here is not precise what we mean. Now changed to "radius".
Q5: Line 381: Only positive eta?
A5: Here does mean the positive eta range only.
2. Paper draft version 6.1
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