STAR HardProbes PWG

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

Hello Qian,

Please find my reply inline.

On 2023-09-20 14:56, tc88qy wrote:
> Hello Barbara and Nihar
>   I included 0-5% centrality to the first bin in the preliminary
> request plots. The results have been updated in the preliminary
> request plots. Please look at the it in this link:
> https://drupal.star.bnl.gov/STAR/system/files/Preliminary_figures_request_1.pdf
>
> Hi Nihar
>  1.Just as I mentioned in previous email. We should look at a
> centrality range with clear physics information.
How do you know what is _clear physics_?
>    20-50% or 20-60% centrality is what people usually look at for QGP
> related study.
>    In peripheral collision, the case could very different from central
> and semi-central collision.
>    I think it would be good to using 0-20%, 20-50% and 50-80% 
> centrality bins.

>  2.I just talking about the data, error bars can touch each other by
> using "TPC 2nd order EP" and "ZDC 1st order EP".
Sorry, Not clear.

>  3. done
>  4. The rho_00 central value in 50-80% is on top of 1/3. While by
> looking at the pT dependence of the same centrality,
>     every data points central value is above 1/3. This is
> inconsistency and related to yield extraction method.
>  5. will done in the talk
Please include in your preliminary request also.

>  6. Please check in the preliminary request plot

Please find additional comment on your preliminary request:
https://drupal.star.bnl.gov/STAR/system/files/Preliminary_figures_request_1.pdf

1) Slide13-14: "Centrality Integral" data point, the plotting style is 
incorrect because of X-axis.
I suggest to use the style of plotting in Fig.2 of Uplsilon PRL paper.
https://journals.aps.org/prl/pdf/10.1103/PhysRevLett.130.112301

2) Slide 15: "global spin alignment signal mainly from the pT range 1-3 
GeV/c"
   Do you mean you only use 1-3 gev/c range only for centrality 
dependence plot like fig. in SLide13,14?
   If so, why don't you consider 3-4 gev/c range?

3) Do you have plan to show both Fig.1 and Fig,2 outside as STAR 
preliminary?
   I am wondering because Fig.2 shows there may be a centrality 
dependence, other hand Fig.1 shows fluctuations across centralities and 
also contradicts the earlier.

Thank you
Nihar

> Regards,
> Qian Yang
>
> On 2023-09-20 15:51, Nihar Sahoo wrote:
> > Hello Qian,
> >
> > My apologies, for my late response.
> > Please find my comments on your preliminary request.
> >
> > 1. On Slide3 "Centrality binning", I would prefer to use 0-20%,
> > 20-40%, and 40-80% binning. Let me know what do you think. As is done
> > in Slide4 right side figure with STAR preliminary.
> > 2. On Slide 4, My expectation that "TPC 2nd order EP" and "ZDC 1st
> > order EP" may give a bit different results. But you quote "Results are
> > consistent with each other due to large error bars in first order
> > measurement". It sounds like using different Detectors ( TPC vs. EPD)
> > and EP order (1st vs 2nd) results are still consistent. Is that you
> > want to say?
> > 3. Slide5 left fig: I think you need to include 0-20% instead of 5-20%
> > centrality for pT-dependence plot. Is not it? [same for Slide7]
> > 4. Slide5: "ρ00 systematic above 1/3 in pT dependence study for
> > 50-80%…" -> But it looks all are consistent with 1/3 (dotted line)
> > within uncertainty except 2-3 GeV/c pT bin (just ~1 sigma difference).
> > Is not that?
> > 5. SLide8: Please Include ALICE reference.
> > 6. Please include also Physics message/conclusion on Slide 6,7,8.
> >
> > Thank you
> > Nihar
> >
> >
> > On 2023-09-20 11:39, Barbara Trzeciak via Star-hp-l wrote:
> > > Hi Qian,
> > >
> > > I don't have strong preference about the 40, 50 or 60%, you can leave
> > > it as you had, 20-50 and 50-80%.
> > > The main point was about not excluding the 0-5% range.
> > > So from my side it's fine. But please wait if conveners have any
> > > comments on this.
> > >
> > > Cheers,
> > > Barbara
> > >
> > > On Wed, 20 Sept 2023, 07:55 tc88qy, <tc88qy AT rcf.rhic.bnl.gov> wrote:
> > >
> > > > Hi Barbara,
> > > >
> > > > The last centrality bin will have large error bar as shown in my
> > > > binning study.
> > > > What about 50-80%, it will reduce the error bars.
> > > > I also checked the 50-80% <N_part> in Isobar, it is comparable
> > > > with
> > > > 60-80% <N_part> in Au+Au.
> > > >
> > > > Qian Yang
> > > >
> > > > On 2023-09-20 12:51, Barbara Trzeciak wrote:
> > > > > Hi Qian,
> > > > > that's also fine. My only worry is that you will have large
> > > > > uncertainty for the pT different rho00 in this bin. But you can
> > > > check.
> > > > > Cheers,
> > > > > Barbara
> > > > >
> > > > > On Wed, 20 Sept 2023, 05:39 tc88qy, <tc88qy AT rcf.rhic.bnl.gov>
> > > > wrote:
> > > > > > Hi Barbara,
> > > > > > I see your point. I agree to include 0-5% centrality to the
> > > > > > first
> > > > > > bin.
> > > > > > If we do 20-40% and 40-80% centrality, the last bin do gain
> > > > > > precisions.
> > > > > > But we probably need to think about the physics information we
> > > > want
> > > > > > to
> > > > > > look at. In our case, it is the charm and anti-charm correlation
> > > > > > that
> > > > > > affecting by QGP. In most the Au+Au analysis, STAR paper then
> > > > talk
> > > > > > about
> > > > > > QGP in a centrality of 0-60%, just like the phi spin alignment
> > > > paper
> > > > > > are
> > > > > > carry out at 20-60%.
> > > > > > So, I suggest we do the binning of 0-20% , 20-60% and 60-80%.
> > > > > > What do you think?
> > > > > >
> > > > > > Qian Yang
> > > > > >
> > > > > > On 2023-09-19 23:39, Barbara Trzeciak wrote:
> > > > > > > Hi Qian,
> > > > > > >
> > > > > > > thanks for point to the slides with additional checks.
> > > > > > > Regarding 0-5% centrality bin:
> > > > > > > As ShinIch also commented, sometimes the most central bin is
> > > > > > remove
> > > > > > > due to poor event plane resolution. However, in this case I
> > > > don't
> > > > > > see
> > > > > > > the resolution being particularly bad, it's not so much worse
> > > > than
> > > > > > for
> > > > > > > the mid-central case. If we have enough confidence to have this
> > > > > > point
> > > > > > > in the centrality differential plot, I don't see a reason why
> > > > not
> > > > > > to
> > > > > > > include it when you integrate to wider centrality ranges.
> > > > > > > Regarding the other binning:
> > > > > > > The reason for having 20-40% and 40-80% is that the precision of
> > > > > > the
> > > > > > > mid-central point is almost the same while the peripheral bin
> > > > > > gains in
> > > > > > > precision compare to the 50-80% centrality range.
> > > > > > >
> > > > > > > Cheers,
> > > > > > > Barbara
> > > > > > >
> > > > > > > On Tue, 19 Sept 2023, 17:21 tc88qy, <tc88qy AT rcf.rhic.bnl.gov>
> > > > > > wrote:
> > > > > > > > Hi Barbara,
> > > > > > > >
> > > > > > > > I replied to the HP list for the comments I got from last HP
> > > > > > > > meeting.
> > > > > > > > Please find the details in this link:
> > > https://drupal.star.bnl.gov/STAR/system/files/jpsiSpinAlignment_20230917.pdf
> > > > > > > > In terms of the binning, I am not sure the reason of 20-40%
> > > > bin.
> > > > > > > > Qian Yang
> > > > > > > >
> > > > > > > > On 2023-09-19 22:15, Barbara Trzeciak wrote:
> > > > > > > > > Hi Qian,
> > > > > > > > >
> > > > > > > > > I see that you consider three centrality classes on plots on
> > > > > > > > slides
> > > > > > > > > 14-16 - same as you presented last week.
> > > > > > > > > As we discussed in more detail at the previous HP meeting, it
> > > > > > > > looks a
> > > > > > > > > bit weird (and I don't know what's the motivation in this
> > > > case)
> > > > > > > > that
> > > > > > > > > you exclude 0-5% centrality bin.
> > > > > > > > > I suggest having the first bin as 0-20% centrality, then
> > > > 20-40%
> > > > > > > > and
> > > > > > > > > 40-80%.
> > > > > > > > > Also, could you please prepare a comparison to the results
> > > > that
> > > > > > > > use
> > > > > > > > > the first order event plane.
> > > > > > > > >
> > > > > > > > > Cheers,
> > > > > > > > > Barbara
> > > > > > > > >
> > > > > > > > > On Mon, Sep 18, 2023 at 10:36 AM tc88qy via Star-hp-l
> > > > > > > > > <star-hp-l AT lists.bnl.gov> wrote:
> > > > > > > > >
> > > > > > > > > > Hello all,
> > > > > > > > > > Please find my preliminary plots request in link below:
> > > https://drupal.star.bnl.gov/STAR/system/files/Preliminary_figures_request_1.pdf
> > > > > > > > > > Qian Yang
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