STAR Correlations and Fluctuations PWG

[Grigory Nigmatkulov <nigmatkulov AT gmail.com>]

Hi Chuan and PAs,

First, I would like to congratulate you with these brilliant and important results!

Please find some questions for your nice study.

General questions:

- Did you take the influence of the momentum resolution of Lambda and Xi, not only p?

- Did you check that protons are not daughter tracks of Lambdas from decays of Lambda->p and Xi->Lambda->p?

- Did you check the two-track effects (merging and splitting) affects daughter protons? How did you do that?

nHits variation and delta-eta vs. delta-phi (not phi*) cuts are quite insensitive to track-merging and track-splitting effects.

- Could you demonstrate the effects of the track-merging and splitting removal procedure?

- When studied pLambda and pXi interactions have you looked at the CFs when hyperons

are selected outside of the signal peak (sidebands)? Could you demonstrate it?

- For final state interaction parameters:

  -- For p-p: I suggest you do add a plot with the world systematics (STAR at 200 GeV, ALICE, others)

  -- For p-Lambda: Please add world systematics (STAR and results from CEBAF)

Abstract:

Please proofread the text. For example:

parametrs -> parameters

remove comma at the of the first line,

etc.

Please make clear what you do with the UrQMD + CRAB and LL model.

slide 3:

Track selection says that transverse momentum criteria is [0.15, 10] GeV/c. Is that for all particles?

Is it true for protons?

slide 5:

Why do you think that the listed values are the sources of systematic uncertainty (especially nsigma values)?

Do you apply purity correction to the correlation functions?

slide 9:

As we discussed yesterday, please update the figure. For example, one could change MC curves with

the markers. Usually curves represent the fit of the function to the data.

Could you show the fits to the data?

pXi should be redrawn because it is completely misleading. Curve does not represent the fit.

slide 10:

Right figure:

- Please explain what pLambda(t) and pLambda(s) are.

- The label says Model. Do you mean UrQMD? If yes, please replace Model with UrQMD

- Why no uncertainties on d0 and f0 are shown for pp pairs?

slide 11:

Please check the uncertainties carefully and write those according to the rounding rules.

Are those uncertainties statistical only? What are the systematic uncertainties on the values?

slide 17:

It would be good to add it to the main figures.

Can you explain why some of the contours  have a "funny" shape? For example, black contour on the right figure?

Cheers,

Grigory