STAR HardProbes PWG

[Barbara Trzeciak <barbara.trzeciak AT gmail.com>]

Hi Priyanka,

one correction, I misread your purity plot.

The overlap region is closer to momentum of 0.9 GeV/c. But when I look at fits from Daniel's presentation they don't seem to be the best in some bins, I would expect some systematics there.

E.g. 1-1.1 p bin has very low purity while 0.9-1 bin has purity almost 100%. When I look at the fit in 0.9-1 GeV, the pion gaussian is too wide which probably causes the amplitude to be lower but I guess make the Kaon purity overestimated. Would be good to see all the fits and the widths and means from the fits of each particle species as a function of p. 

Cheers,

Barbara

On Thu, Aug 31, 2023 at 5:20 PM Barbara Trzeciak <barbara.trzeciak AT gmail.com> wrote:

Hi Priyanka,

I have questions on your purity correction. 

- Why does your correlation function have no statistical uncertainties before the purity correction and has sizable uncertainties after the correction ?  Also the plot says D0-pi pairs but I thought you wanted to approve the D0-K correlation function. I'm a bit confused here.  Also, I don't see any uncertainties on your kaon purity plot, so I don't understand how it can influence your statistical uncertainty.

Kaon purity: 

- how 3% uncertainty was evaluated here, I would expect that in the overlap region, at ~0.6-0.8, the sys. unc. is be large .

- The purity is up to 1 GeV/c, what do you assume for the higher pT range ? 

- And as far as I understand you use average. But do you know what Kaon pT dominates your sample ? Do you have any Kaon pT selection in the data analyses ? 

- How do you have 10% on the pair purity ? 

Physics message. I would say that the data are consistent with no correlation, rather than with any of these pp models. 

Also, you make a conclusion on the correlation source size. But do we know that the correlation function is not modified in HI compared to pp ? 

Cheers,

Barbara

On Thu, Aug 31, 2023 at 5:08 PM Barbara Trzeciak <barbara.trzeciak AT gmail.com> wrote:

---------- Forwarded message ----------

From: "Roy Chowdhury Priyanka (DOKT)" <priyanka.roy_chowdhury.dokt AT pw.edu.pl>
To: Star-hp-l <star-hp-l-bounces AT lists.bnl.gov>
Cc: 
Bcc: 
Date: Thu, 31 Aug 2023 14:19:45 +0000
Subject: Preliminary figure request for D0-K femtoscopic correlation

Dear Convenors,

I have submitted a request for preliminary label on my D0-K correlation function. My slides are here https://drupal.star.bnl.gov/STAR/system/files/QM_proposal_PreliReq_Priyanka.pdf

I updated the poster with the same figure as "fig 10" on my submitted poster draft. I will upload the new version of the poster ASAP.

Regards,

Priyanka