STAR HardProbes PWG

[Yi Yang <yiyang0429 AT gmail.com>]

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? 

  - 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. 

  - p7: identification --> Identification   (two places) 

          You should add a description on "EPD ', like the other three subdetecctors. 

 -  p8: More differential measurements 

 -  p9 and p10: I would put "central" and "peripheral" in the title to make it clear. 

 - p10: you have the cartoons for collisions, can you add them in here as well? 

 - 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 

 - p16: Adding J/psi v2 from LHC in the right-handed plot? 

 - 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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