STAR HardProbes PWG

[Xinyue Ju <xinyju AT gmail.com>]

Hi Babara,

Thank you for your valuable comments. Please find the updated analysis note on the following link, it will be updated to the paper proposal web page soon.

https://drupal.star.bnl.gov/STAR/system/files/Run14DplusAnalysisNote.pdf

Here are some explanations for the comments:

-p10: I add a table with all the topo. cuts

-Fig. 5, the cut value here is the TMVA weights to determine the real cuts, I add some explanation on p10

-p11: I fit the bkg. function to the wrong sign distribution first then fit to the right sign distribution plus a Gaussian function

-p14: I added momentum resolution plots 

-Fig. 12 left: I checked and it is due to low statics on that bin, and we require the kaon pT > 0.3, so this will not contribute to kaon PID

-p17: I added the fit function and lines on the plot

-p20: yes the stat. fluctuation was removed, I added a description on p22

-p20, 21: no it's the total TPC tracking uncertainties. The average is 8% on the full pT range actually. There are some fluctuations because I calculated it bin by bin. I can set it to 8% on all pT regions.

-p20: PID sys. unc. for run14 and run16 is considered to the same value of 3%, I change the description on this.

- Fig. 18: I removed this data point before because it is not included in the run14+run16 spectra. I added the 40-80% 0-0.5 GeV data point in Fig.19 now.

- p29: I added a new total cross-section including Xi_C on p31. The number in Tab. 6 is the total cross-section of D0 D+ Ds and Lc, we also explain this in the Dplus paper draft. Because there is no measurement of Xi_C close to RHIC energy, it could be arbitrary if we take the number from PYTHIA or ALICE p+p. We think it is better to report the total cross-section of  D0 D+ Ds and Lc here

Best Regards,

Xinyue

Barbara Trzeciak via Star-hp-l <star-hp-l AT lists.bnl.gov> 于2023年1月23日周一 22:15写道：

Hi Xinyue,

the analysis note looks good. 

I have a few comments and questions:

- p10: please add a table with all the cut values, for the 6 pT and 3 centrality bins. 

Also, it would be useful if you add plots like Fig.5 but for other pT and centrality bins. It can be in an appendix, or just a link to a separate document with all the plots.

- Fig. 5 :"The significance (green) achieves its maximum value when the cut value is 0.535" - it's not explained in the text what is the cut that is mentioned here. 

- p11: do you fit your bkg. function to the correct and wrong sign distribution in the side-band regions ?

- p14: do you have momentum resolution plots for pi and K ? It would be nice to add them to the AN and refer to another note in case they are already shown somewhere else for 2014 data. 

- Fig. 12 left: do you know why there is this jump up for the first point in the Kaon nSigma cut efficiency ?

- p17: "The TOF matching efficiency, TPC PID efficiency, and TPC PID efficiency distributions are fitted with the pol8 function to extrapolate to full pT range" - each of this efficiency is fitted separately with a pol8 function ? Would be good to see some examples of these fits. 

- p20: have you taken into account the Barlow criterion when assigning the sys. unc. from the cut variations ? This procedure should be followed to avoid accounting for stat. unc. in the sys. unc. estimation. 

This approach was used for 2016 data analysis and I think it should be consistently used here as well. 

- p20, 21: TPC tracking efficiency - your sys. unc. numbers for D meson are quite small in some pT bins. What is your TPC tracking systematic uncertainties for a single particle ?  In 2016 this number is ~3%, and since you have 3 daughters that gives ~9% (3*3%) for a D+/- meson.

- p20: PID sys. unc. are smaller than for 2016 data - I think it's better if the same approach is used for 2014 and 2016. 

- Fig. 18: why don't you include the 0.5-1 GeV/c bin for 40-80% centrality ? The signal significance there is more than 5sigma. 

- p29: of the pT spectra at unmeasured low pT range is known -> of the pT spectra at unmeasured low pT range is not known

- p29: It's not clear to me if you included Xi_C contribution to the sys. unc. on the total charm production cross section ? Page 25 ("By quoting this into systematic ... ") suggests so, but the number in Tab. 6 is the same as you showed before. 

Cheers,

Barbara

On Tue, Jan 17, 2023 at 11:05 AM Barbara Trzeciak <barbara.trzeciak AT gmail.com> wrote:

Hi Jan, Xinyue,

thanks a lot for the note. I will have a look asap and let you know my comments.

Just wanted to ask about the total charm cross section on which we recently had discussion in the PWG meeting.

There were a few questions/suggestions related to the treatment of the sys. unc. 

Xinyue, have you had a chance to address these comments and include them in the analysis note ? 

Cheers,

Barbara

On Sat, Jan 14, 2023 at 5:26 AM Vanek, Jan via Star-hp-l <star-hp-l AT lists.bnl.gov> wrote:

Hello Everyone,

Xinyue made some updates to the Run14 analysis note. The new version is uploaded to the paper proposal web page:

https://www.star.bnl.gov/protected/heavy/vanekjan/Dpm_web/Home.html

Best regards,

Jan.

---

Od: Star-hp-l <star-hp-l-bounces AT lists.bnl.gov> za uživatele Vanek, Jan via Star-hp-l <star-hp-l AT lists.bnl.gov>
Odesláno: pátek 13. ledna 2023 12:08
Komu: STAR HardProbes PWG <star-hp-l AT lists.bnl.gov>
Předmět: [Star-hp-l] D+- Run14 analysis note

 

Hello Everyone,

I'm happy to let you know, that I have just uploaded the Run14 D+- analysis note to the paper proposal web page:

https://www.star.bnl.gov/protected/heavy/vanekjan/Dpm_web/Home.html

Please let us know if you have any questions or comments. Thank you.

On behalf of the PAs, best regards,

Jan.

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