STAR HardProbes PWG

[Yi Yang <yiyang0429 AT gmail.com>]

Hi Te-Chuan,

Thanks a lot for the updated results. 

Please add a bullet for "The 5 - 6 GeV pT bin is not statistically independent of the MB result." in figure 1 - 4.

Cheers,

Yi

On Fri, Sep 1, 2023 at 9:45 AM Te-Chuan Huang <tchuang AT rcf.rhic.bnl.gov> wrote:

Hi Yi,

Thanks for your comments.

For the large signal extraction uncertainties, they are all only due to changing the mass window cut. (See p22, the green points are systematically higher)

As I mentioned in previous response, in 0-10% bin, there are data points jumping near 2.65 GeV and 3.2 GeV in mass distributions.

When I extended the mass window from [2.7, 3.2] to [2.6, 3.25] to count the J/psi, I got ~20 more J/psi for pT > 6 GeV bins and ~40 more J/psi in 5 < pT < 6 GeV bin.

They will contribute as about 10-20% uncertainties.

For the legends and colors, I changed back to “BHT2" and used different colors between MB results and BHT2 results.

Cheers,

Te-Chuan

On Aug 31, 2023, at 11:48 PM, Yi Yang <yiyang0429 AT gmail.com> wrote:

Hi Te-Chuan,

Could you please double check again the numbers of systematics for signal extraction, in particular 0-10% and 10-20%? 

The mass spectra look similar (p15), and the first pT bin in 10-20% also looks bad, but the systematics much smaller compared to the first pT bin in 0-10% (p25). 

Regarding the label, I would think you should use "BHT2", but just put a note in your slide saying that the first pT bin (5-6 GeV/c) is not statistically independent of the MB result. 

By the way, I would use a different color or different marker to easily distinguish between old and new results...

Cheers,

Yi

On Thu, Aug 31, 2023 at 10:19 PM Te-Chuan Huang <tchuang AT rcf.rhic.bnl.gov> wrote:

Hi Isaac,

Thanks for your questions.

For the signal extraction uncertainty, the mass distributions in 0-10% bin after background subtraction, some data point jumped up dear the J/psi signal.

So, when I varied the mass window range when counting J/psi, I got a little bit larger number.

For the figures, I changed the legend “BHT2” to “BHT2, not independent”.

I made some changes on the colors and markers to make it more consistent with what is shown in Yan’s talk.

Figure 5 and 6, I removed pT > 5 GeV results for comparison only for low pT results. The only change compared to old preliminary plots is I changed the colors of all published results to gray-ish color.

Figure 7 is a comparison of pT > 0 GeV and pT > 5 GeV results.

Figure 8 is for comparison only of high pT results.

Cheers,

Te-Chuan

On Aug 31, 2023, at 8:24 PM, Mooney, Isaac <isaac.mooney AT yale.edu> wrote:

Hi Te-Chuan,

I think we talked about this in a meeting at some point, but can you remind me why the signal extraction uncertainty is so much larger for 0-10% than the rest of the centrality bins? Looking at the signal extraction plots, by eye and by chi^2 it doesn’t look like there is such a sharp distinction between 0-10 and 10-20%. Sorry for possibly repeating this question.

We also talked with Rongrong today and think it would be a good idea to add a message on plots where the BHT2 and previous result are shown in the same bin that the data points are not independent. Could you add this?

Otherwise, I am happy with the preliminary request slides.

Thanks,

Isaac

On Aug 30, 2023, at 9:35 AM, Yi Yang via Star-hp-l <star-hp-l AT lists.bnl.gov> wrote:

Hi Te-Chuan, 

I forgot to say that you don't need the shedded uncertainties on data points in Fig. 5 and Fig. 6. 

Cheers,

Yi

On Wed, Aug 30, 2023 at 9:17 AM Yi Yang <yiyang0429 AT gmail.com> wrote:

Hi Te-Chuan,

Thanks a lot for the updated request and replies. I don't have any further comments on it. 

Cheers,

Yi

On Mon, Aug 28, 2023 at 4:31 PM Te-Chuan Huang <tchuang AT rcf.rhic.bnl.gov> wrote:

Hi Yi,

Thanks a lot for your useful comments. I have implemented them accordingly.

Followings are my answers to your questions:

- p7: pp reference for pT < 8 GeV was used in VPDMB30 study. It was calculated using the same method of Au+Au published result with PHENIX+STAR data. However, it was only calculated up to 8 GeV and there is no PHENIX data at high pT. So, there should be no significant difference in higher pT region. Therefore, I directly used STAR p+p results.

- p12: No special meaning. I checked if efficiency has difference between Ru+Ru and Zr+Zr before. “Both” just means this plots is produced with Ru+Ru and Zr+Zr combined. I covered it with the cut applied to avoid confusions.

- p26: Not pretty sure the reason but this bin has very few statistics. ~35% of the bins in mass distribution are empty.

- p34 and 35: Yes, I produced the plots since people were interested how BHT2 result compared to VPDMB30 results, and pT > 5 GeV results comped to Au+Au and CMS high pT results will look like during the PWG meeting.

Cheers,

Te-Chuan

On Aug 28, 2023, at 2:36 AM, Yi Yang <yiyang0429 AT gmail.com> wrote:

HI Te-Chuan,

Thanks a lot for the preliminary request. I have some minor comments/suggestions for your consideration. 

 - It would be good to mention this is the "dielectron channel" somewhere in the beginning. 

 - p7: you mentioned a reason for using Ziyue's pp reference for pT < 8 GeV and Run 12 for > 8 GeV, could you please remind me again and put it in this slide?

 - p12: left-handed plot, what does "Both" mean? Please indicate it in the plot. 

 - p13: please add "%" in the legend 

 - p26: Do you know why your result in the first N_part bin is significantly lower than the previous results? Is it because the pT cut (5 GeV vs. 0.2 GeV)?

 - p28 - p33: Please add physics messages for each plot. 

 - p34 and p35: I don't think you need to request a new preliminary for them since they contain the same physics messages, but replotting them. Do you miss references for some of the data points?

Cheers,

Yi

On Fri, Aug 25, 2023 at 11:46 PM Te-Chuan Huang via Star-hp-l <star-hp-l AT lists.bnl.gov> wrote:

Dear Hard Probes Conveners,

Please find my preliminary request slides at: https://drupal.star.bnl.gov/STAR/system/files/TeChuan_JpsiRaa_PreliminaryRequest.pdf

Any comment and suggestion will be more than welcome.

Cheers,

Te-Chuan

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