STAR HardProbes PWG

[tc88qy <tc88qy AT rcf.rhic.bnl.gov>]

Hi all
  Please find the new version in the same link(v5).
   As Barbara suggested it would be good that Yu-ming can prepare some 
materials for TPC event-plane method in slide 13.
   Please provide me the systematic uncertainties in slide 14 
(20-60%)and 15 (pT-integral) ASAP.

  I have a concern about the TPC method. We currently do not estimate 
the non-flow contribution, which could be a main source for high-pT 
J/psi especially for a small system.
Comparing to Au+Au with similar N_part, the non-flow is about 0.2 for 
J/psi. If I was asked  about the non-flow contribution during the 
meeting. How do we reply? we should have a strategy now.

 For other comments please find inline.
 Also to remind you, my talk is June 14, which is 5 days to go. So 
please send out your comments ASAP.

 Yi please find my reply inline below.
Qian Yang


On 2022-06-09 14:55, Yi Yang wrote:
> Hi Qian,
>
> Thanks a lot for the updated version.
>
> I have some comments/suggestions for your consideration:
>   - p3: (top part) you should mention that "early creation" and "long
> lifetime" can lead you to understand the QGP evolution, otherwise
> these two pullets seem to have no connection.
>           (bottom part) Make them larger? And highlight v2 with
> different colors?
done
>   - p5: In the previous page (p4), you compare LHC and RHIC, I would
> think that it would be better if you could compare the v2 from LHC
> here again and mention what we can learn more than LHC.
>           (I understand that you want to emphasize the systema size on
> this page, but it seems more natural compared to the LHC's results.)

>   - p6: minimum bias + high tower
>           But the EPD has worse event plane resolution, right? Should
> we mention it? Probably you can mention it orally.
done
>   - p7: identification --> Identification   (two places)
>           You should add a description on "EPD ', like the other three
> subdetecctors.
done
>  -  p8: More differential measurements
done
>  -  p9 and p10: I would put "central" and "peripheral" in the title to
> make it clear.
done
>  - p10: you have the cartoons for collisions, can you add them in here
> as well?
done
>  - p13: Yu-Ming also has a very nice J/psi mass plot, can you add one
> of them in this page?
>  - p14: I remember what we discussed on the right-handed plot is using
> 20 - 60% for both SP and EP from isobar (like the left-handed one),
> right?
>             (Yu-Ming is working on this plot now.)
>           Second bullet: I am not sure I can get "Significant non-flow
> suppression by using scalar-product method" from the plot (I assume
> you are talking about the right-handed one). Since you might change
> the right-handed plot, you might consider restating this bullet.
>           (By the way, I thought it is "known" that using the non-flow
> contribution will be smaller using scalar-product method, right?)

>  - p15: I would suggest using the pT dependent plot for isobar (the
> right-handed plot on p14), and please add the HT result here.
>            - Most precise v2 measurement
>            - It would be good to make the v2 = 0.003 +/- 0.017 +/-
> 0.010 in one line
We are comparing a result with zero. Then what we want to answer is a 
question of yes or no. I think it would be more suitable to give 
audience an idea of our final conclusion.

>  - p16: Adding J/psi v2 from LHC in the right-handed plot?
The reason I did not put LHC v2 result is that this is a short talk. It 
will be good to more focus on our physics picture. RAA and v2 at RHIC 
alone is already fruitful for this talk.
>  - p17: Should mention RAA first (this is the order of your
> presentation).
>             Any remarks from comparing the RHIC and LHC results?
>
> Cheers,
> Yi
>
> On Wed, Jun 8, 2022 at 7:07 PM tc88qy via Star-hp-l
> <star-hp-l AT lists.bnl.gov> wrote:
>
> > Hi Barbara and all
> >
> > After a local STAR group rehearsal, I updated the new version in
> > the
> > same link (v4)
> > Please send out your comments. Thanks
> >
> > Qian Yang
> >
> > On 2022-06-05 09:50, tc88qy via Star-hp-l wrote:
> > > Hi Barbara
> > >
> > > Thanks for your suggestion, Please find my rely inline. and new
> > > version of slides are in the same link
> > >
> > >
> > > Qian Yang
> > >
> > > On 2022-06-04 16:37, Barbara Trzeciak wrote:
> > > > Hi Qian,
> > > >
> > > > thanks for the update. The slides are very nice, please find my
> > > > comments below.
> > > >
> > > > Cheers,
> > > > Barbara
> > > >
> > > > s3 - I would also mention CNM effects
> > > Here I want to more focus on the hot medium effect. so I did not
> > > mention CNM.
> > >
> > > > s4 -  How it affect ->  How is it affected
> > > done
> > > > s5 - w be established -> evolves (?)
> > > done
> > > > s6 - v2 -> v_2
> > > done
> > > > s8 - make the left plot larger
> > > done
> > > > s9- dependence were shown -> dependence is observed
> > > done
> > > > s11 - you can emphasise here precision of the isobar measurement
> > > done
> > > > s13 - it would be good to have better quality plots here. Maybe
> > > > Yu-Ming can prepare example procedure figures with better
> > graphics.
> > > > Also, are these efficiency weighed, is there some physics one can
> > > > extract ?
> > > Sure, It will be good that Yu-Ming can prepare one page of slides
> > for
> > > the procedure.
> > > The graphic is from Yu-Ming's preliminary request slides, I think
> > it
> > > is efficiency weighted.
> > >
> > > > s14 - I think it makes more sense to compare 0-80% isobar to
> > 0-80%
> > > > Au+Au - so to have the Au+Au results on the left plot. But let's
> > also
> > > > see what others think and we can then decide on the final version
> > of
> > > > these plots.
> > > > Also, for the 20-60% range please keep in mind that Yu-Ming might
> > have
> > > > his HT results early next week - in this case please update the
> > plot.
> > > > s15 - since we have higher pT results it would be nice to have
> > here
> > > > also the integrated v2 for higher pT > 4 GeV/c from the HT.
> > >
> > > ok
> > >
> > > > s15 - it's not so obvious to me how much better precision we have
> > in
> > > > isobar compared to Au+Au. Is it possible to combine Au+Au for pT
> > < 4
> > > > GeV/c ? Also, I think it would be better not to combine stat. and
> > sys.
> > > > uncertainties for Au+Au results (also for the other comparison),
> > it
> > > > might show better statistical differences between the two
> > results.
> > > The combination is not just combine the final physics data point,
> > But
> > > do the extraction from the beginning.
> > > and the stat. and sys. are all needs re-calculation.
> > > I did not put sys. uncertainties for the Au+Au results, the error
> > bars
> > > are just stat. uncertainties.
> > > But the sys. uncertainties is small for Au+Au.
> > >
> > > > s15 - for low pT, i.e. ~< 1 GeV/c, we expect 0 v2 because of the
> > mass
> > > > effect. If it's fast, can you calculate integrated v2 for pT > 1
> > GeV/c
> > > > ?
> > > I need to do some change to have this results. Let's us see, If I
> > can
> > > have the final results next week.
> > > > On Fri, Jun 3, 2022 at 8:54 AM tc88qy via Star-hf-l
> > > > <star-hf-l AT lists.bnl.gov> wrote:
> > > >
> > > > > Hello All
> > > > >
> > > > > As we discussed in yesterday's HP meeting. I have updated the
> > > > > slides to
> > > > > a new version.
> > > > > Please find in the same link. Your comments and suggestion are
> > > > > welcome.
> > > > >
> > > > > Qian Yang
> > > > >
> > > > > On 2022-05-31 19:27, webmaster--- via Star-hf-l wrote:
> > > > > > Dear star-hf-l AT lists.bnl.gov members,
> > > > > >
> > > > > > Qian Yang (qianyangstar AT gmail.com) has submitted a material for
> > a
> > > > > > review,
> > > > > > please have a look:
> > > > > > https://drupal.star.bnl.gov/STAR/node/59787
> > > > > >
> > > > > > ---
> > > > > > If you have any problems with the review process, please
> > contact
> > > > > > webmaster AT www.star.bnl.gov
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