STAR HardProbes PWG

[Nihar Sahoo <nihar AT rcf.rhic.bnl.gov>]

Hello Wei,

I don't have comment on your preliminary request.
I sign off.

Best
Nihar

On 2024-09-19 11:37, Yi Yang wrote:
> Hi Wei,
>
> Thanks a lot for the updated version.
> I don't have any further comments on it.
> Looking at p24, I think the different is at low mass point and it
> dragged the background up.
> If you have time, you can try to fit from 2.9 to 3.4 since you
> probably don't need to cover to this wide mass range.
>
> Cheers,
> Yi
>
> +++++++++++++++++++++++++++++++++++++++++++++++++++
> Yi Yang, Research Fellow
> Institute of Physics, Academia Sinica
> E-Mail: yiyang429 AT gate.sinica.edu.tw
> Tel: +886-2-2789-6709
> +++++++++++++++++++++++++++++++++++++++++++++++++++
> -----Original message-----
> From:张炜<wzhang AT m.scnu.edu.cn>
> To:STAR HardProbes PWG<star-hp-l AT lists.bnl.gov>
> Cc:Nihar Sahoo<nihar AT rcf.rhic.bnl.gov>,Yi Yang<yiyang AT ncku.edu.tw>
> Date: Wed, 18 Sep 2024 16:14:06
> Subject: Re: [[Star-hp-l] ] Preliminary request for J/ψ analysis at
> Au+Au17.3GeV
> Hi Yi and Isaac,
>
> Thank you for the nice comments.
>
> for Yi's comments:
>
> p2.
> I've changed the 'PA name' to 'PA representative name.' After HP 2024,
> I will submit a paper proposal, and all the PAs will be listed at that
> time.
>
> p8.
> Yes, your understanding is correct. In the formula for additional
> momentum smearing, the parameter 'b' in the numerator comes from the
> 'b' contained in σembedded\sigma_{\text{embedded}}, they are same;
>
> p16.
> I don't know the exact reason at the moment, but I have listed the raw
> signal counts and the corresponding pair efficiency when using the
> default and wide nsigmae cuts on slide 24 (backup).
> Also，I add a slide to summarize the physics message of this analysis
> on slides 25,26.
>
> for Isaac's comments:
>
> p6.
> The Vz range depends on the centrality definition. In fact, for the
> Au+Au 27 GeV centrality definition, they used |Vz| < 70 cm, while for
> 19.6, 17.3, and 14.6 GeV, it's |Vz| < 145 cm. However, when I started
> the analysis for 19.6 and 14.6 GeV, I wasn't aware of the exact value,
> so I just looked at the Vz distribution from the MB trigger and, in
> order to maximize statistics, I chose a 150 cm cut. But I think for
> publication, it should be consistent with the centrality definition.
>
> When performing the extrapolation, we fitted the J/ψ pTp_T​
> distribution for 19.6 GeV and found that 99.7584% of J/ψ are below 4
> GeV. Therefore, we can use this ratio to estimate how many J/ψ have
> pT>0p_T > 0 GeV. For 17.3 GeV, I used the results from 19.6 GeV when
> performing the extrapolation. I updated the relevant plot on page 27
> of the slides.
>
> p12.
> The black dashed line here represents the envelope of the largest
> variations in the systematic uncertainties. However, we did not
> ultimately use this method; instead, we used the RMS of this set of
> data as the systematic uncertainty for each bin.
>
> p13.
> The selection criteria for these two plots are different because when
> calculating the nsigmae cut efficiency, it means we cannot use any
> nsigmae-related cuts. Similarly, when calculating the TOF matching
> efficiency, we shouldn't use TOF-related cuts to select electron
> candidates.
>
> p19.
> Thank you for the correction.
>
>  Once again, thank you very much for your excellent comments. If you
> have any further feedback, please feel free to let me know.
>
> Best,
> Wei
>
> ------------------ Original ------------------
>
> From:  "Mooney, Isaac"<isaac.mooney AT yale.edu>;
> Date:  Tue, Sep 17, 2024 04:09 AM
> To:  "STAR HardProbes PWG"<star-hp-l AT lists.bnl.gov>;
> Cc:  "Nihar Sahoo"<nihar AT rcf.rhic.bnl.gov>; "Yi
> Yang"<yiyang AT ncku.edu.tw>;
> Subject:  Re: [[Star-hp-l] ] Preliminary request for J/ψ analysis at
> Au+Au17.3GeV
>
>  Hi Wei,
>
> I also only have some minor questions on the preliminary request (see
> below).
>
> Thanks,
> Isaac
>
> 6.
> How was the vertex z range determined? I notice that for the 27 GeV,
> the z vertex range was much smaller, while for the 19.6 and 14.6 (150
> cm) it's slightly larger than this 145 cm.
> I see that the number of accepted events is about half that of the
> 14.6 GeV for example. Is this why the pT > 2 GeV bin is not included
> for the 17.3 GeV dataset? Because you run out of statistics? Is the
> upper cutoff for the pT integration then 2 GeV for e.g. the Fig. 3
> values? Does it affect the result at all if you include whatever small
> counts you get above 2 GeV? I assume not, just wondering.
>
> 12. Is the black dashed line the maximum envelope of the systematic
> variations in each bin, or the total systematic uncertainty in the
> bin? Or are these two things the same (i.e. you're using the maximum
> envelope as the uncertainty?
>
> 13. Maybe this is a silly question, but why does the S/B ratio here
> say 80.97 for the 0.02 pair mass maximum, while on s. 15 it says
> 69.62?
>
> 19.
> You say R_AA increases with increasing pT, but this isn't a pT
> dependent plot. I think this bullet was meant to refer to the previous
> figure. The caption also refers to pT when it should say Npart.
> The legend has the wrong marker for 17.3 GeV.
>
> > On Sep 14, 2024, at 06:15, Yi Yang <yiyang429 AT gate.sinica.edu.tw>
> > wrote:
> >
> > Hi Wei,
> >
> > Thanks a lot for the slides for the preliminary request.
> > I only have some very minor comments and questions.
> > - p2: Are you the only PA for this analysis? It would be good if
> > you can list all.
> > - p8: In the additional smearing, there are 3 parameters: a, a',
> > and b, if I understand correctly, the smearing parameter from
> > embedding is a and b, then you add an additional smearing for
> > comparing to data. Is parameter "b" the same for embedding and
> > additional smearing?
> > - p16: the systematic from n_sigma_e for 20-40% is much larger than
> > other centrality bins, do you know why?
> > - It would be good if you can add a slide to summarize the physics
> > message of this analysis for others who will present this result in
> > the future.
> >
> > Cheers,
> > Yi
> >
> > +++++++++++++++++++++++++++++++++++++++++++++++++++
> > Yi Yang, Research Fellow
> > Institute of Physics, Academia Sinica
> > E-Mail: yiyang429 AT gate.sinica.edu.tw
> > Tel: +886-2-2789-6709
> > +++++++++++++++++++++++++++++++++++++++++++++++++++
> > -----Original message-----
> > From:张炜<wzhang AT m.scnu.edu.cn>
> > To:Mooney, Isaac<isaac.mooney AT yale.edu>,Nihar
> > Sahoo<nihar AT rcf.rhic.bnl.gov>,Yi Yang<yiyang AT ncku.edu.tw>,STAR
> > HardProbes PWG<star-hp-l AT lists.bnl.gov>
> > Date: Tue, 03 Sep 2024 11:13:31
> > Subject: [[Star-hp-l] ] Preliminary request for J/ψ analysis at
> > Au+Au17.3GeV
> > Hello Isaac, Nihar, and Yi,
> >
> > I hope this email finds you well.
> >
> > Here are my preliminary request slides for Hard Probes 2024:
> https://drupal.star.bnl.gov/STAR/system/files/Prelim_Request_17p3.pdf
> > Please let me know if there are any specific areas that need
> > adjustment or further detail. I am more than happy to make revisions
> > based on your guidance.
> >
> > Thank you for your time and assistance.
> >
> > Best regards,
> > Wei