STAR Correlations and Fluctuations PWG

[Sam Heppelmann <sheppelmann AT gmail.com>]

Hi ShinIchi,

I want to share a recent plot comparing two rapidity ranges -0.1 < y < 0 and 0 < y < 0.1 in the pT range 0.4 < pT < 2.0 GeV/c. The plot shows that the two rapidity ranges on either side of mid rapidity agree, where the only difference is the TPC and TOF acceptance. 

I haven't made a direct comparison plot of UrQMD and the toy GM model but I included a slide showing the difference in the Npart distributions.   

Best,

Sam

On Thu, May 6, 2021 at 8:20 AM ShinIchi Esumi <esumi.shinichi.gn AT u.tsukuba.ac.jp> wrote:

Dear Sam 

Thanks for the nice results and proposals, I have a few questions/suggestions. 

(1) Since you have efficiency map within your acceptance, you could use this 

acceptance filter in your cumulants calculation for UrQMD, possibly including PID 

cuts, in order to make sure pT-y dependent acceptance is not affecting the physics 

comparison between data-model. You could parameterize the dE/dx (mean and 

width) based on the absolute momentum and Bethe-Bloch formula for the TPC 

PID using Nsigma cut, as well as the TOF acceptance via eta cut on top of your 

acceptance filter without running Geant including PID, at least, to mimic the realistic 

pT-y dependent acceptance (especially for the anti-diagonal acceptance/efficiency 

step given by |p|<2GeV cut) that you've shown in your Fig.2 (p5) to be taken into 

account in the data-model comparison especially for Fig.3 (p6) acceptance 

dependent comparison of the results. After all I guess you are doing the efficiency 

correction in 2D(pT, y), so the current comparison could already be reasonable, 

though. I would also like to see TOF and TPC acceptance in your Fig.6 (p12) in 

the same rapidity or eta (the same x-axis) definition between the two panels. 

(2) Some comparisons between two Npart distributions (correlation between them); 

one from UrQMD and another one from Glauber could be informative, although 

event-by-event comparison could be difficult, but one can at least compare the 

two Npart distributions for a given centrality selection with the Refmult3 in UrQMD 

(or NBD superimposed multiplicity for the case of Glauber), where independent 

particle production per participant or collision is not anyway required nor forced 

in UrQMD anyway, so that they can easily be different a lot especially in terms 

of centrality dependence. 

Best regards, ShinIchi

On May 6, 2021, at 16:02, Sam Heppelmann via Star-cf-l <star-cf-l AT lists.bnl.gov> wrote:

Hi All, 

Here are my slides to discuss the status of the 3.0 GeV cumulants paper and to request a GPC.

https://drupal.star.bnl.gov/STAR/system/files/cf_pwg_3GeV_cumulants.pdf

Additionally, here is the paper draft, supplemental material draft, and analysis note:

Paper Draft:   https://drupal.star.bnl.gov/STAR/system/files/ShortPaperDraft_Measurements_of_Proton_Higher_Order_Cumulants.pdf

Supplemental Material:   https://drupal.star.bnl.gov/STAR/system/files/Supplemental_Measurements_of_Proton_Higher_Order_Cumulants.pdf

Analysis Note:   https://drupal.star.bnl.gov/STAR/system/files/Note_Cumulants_FXT_3GeV_v1_0.pdf

Best,

Sam

On Tue, May 4, 2021 at 3:17 AM Hanna Paulina Zbroszczyk via Star-cf-l <star-cf-l AT lists.bnl.gov> wrote:

Dear CF PWG colleagues,

We will have our weekly CF PWG meeting on Thursday, May 6th, 9:30 AM (BNL time).

If you would like to contribute, please let us know. 

Please post your slides by Wednesday.

We will connect via Zoom. Connection details you will find under the usual page.

First speaker is Sam this week.

Best regards, 

Xiaofeng and Hanna

https://drupal.star.bnl.gov/STAR/blog/luoxf/correlations-and-fluctuations

https://drupal.star.bnl.gov/STAR/blog/gos/correlations-and-fluctuations-preliminary-plots

Hanna Paulina Zbroszczyk

PhD DSc Eng, Professor WUT

E-mail: hanna.zbroszczyk AT pw.edu.pl

Tel: +48 22 234 5851 (office)

Address:

Warsaw University of Technology

Faculty of Physics

Nuclear Physics Division

Koszykowa 75

Office: 117b (via 115)

00-662 Warsaw, Poland

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Samuel Heppelmann

Ph.D. Candidate, Nuclear Physics Group

UC Davis

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Samuel Heppelmann

Ph.D. Candidate, Nuclear Physics Group

UC Davis

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