STAR HardProbes PWG

[Tristan Protzman <tlp220 AT lehigh.edu>]

Hi All,

The jobs analyzing the data and throwing out 4% of tracks have completed, the results have been attached.  The new points fall within uncertainties, demonstrating that statistical fluctuations are dominant.  I have updated the preliminary figure request as well.

Preliminary Figure Request: Azimuthal Anisotropy of Jets in √(s_NN )=200 GeV Ru+Ru and Zr+Zr Collisions (bnl.gov)

Cheers,

Tristan

On Wed, Oct 5, 2022 at 10:04 AM Tristan Protzman <tlp220 AT lehigh.edu> wrote:

Slide11:
_For hard core jets, do you perform jet-by-jet rho times jet area
subtraction?

No, the assumption is the high pT tracks of hard cores are most likely from a hard scattering, and as such there is not a background component to remove.  

_For hard core jet selection, have you checked with pT>1.5 GeV/c and 2.5
GeV/c? Do you have such plots for comparison like your right side plot? 

It's not exactly what you're asking for, but in my update to Hard Probes on 8/18, (slide 6) I showed the effect of 1, 2, and 3 GeV/c constituent cuts on 30-50% central with a subset of the available data.  All three cuts were within the uncertainty of each other.  I am currently running over the full data and will have the information I need to repeat this plot with the current kinematic cuts.

Slide16:
_Do you understand why your last bin is going down to negative for
hardcore only jet?
I would expect at high pT all these jets give the same v2 (or matched
jet and hardcore jets would be the same). 
Is this just statistical fluctuations? 

Yes, I believe this is getting into the area of statistical fluctuations.  

_Can you please show Delta phi distributions (like slide#13) of that pT
bin (where v2 is negative) for all three types of jets? 

Certainly, see the updated slides here (slides 19 - 20): Preliminary Figure Request: Azimuthal Anisotropy of Jets in √(s_NN )=200 GeV Ru+Ru and Zr+Zr Collisions (bnl.gov)

Slide#17:
_ I like this plot to be "STAR Preliminary" with 5-40GeV/c pT range
instead of your slide14; but you can keep this slide#14's plot as a
backup. 
_ I would suggest the following cosmetic changes. 
1. Make STAR data points anything filled with red markers. 
2. Make ALICE markers with a lighter tone of green/gray color(make it a
bit transparent or all color gray such that it would not dominate over
StAR data point by look). In this current format, ALICE data points are
dominating to the eye. 

I agree, these changes make the STAR points appear as the more important point.  See the updated slides.

On Wed, Oct 5, 2022 at 9:17 AM Tristan Protzman <tlp220 AT lehigh.edu> wrote:

Hi Nihar,

Thank you for the comments.  I submitted a draft of my HQ talk last week, and updated it last night.  If you are unable to see that please let me know and I will resubmit it now.  

I will follow up shortly with my responses to your questions.

Cheers,

Tristan 

On Wed, Oct 5, 2022 at 9:10 AM Nihar Sahoo <nihar AT rcf.rhic.bnl.gov> wrote:

Hello Tristan,

As we don't have sufficient time for checks and discussion on your new
jet v2 result which is an interesting result from STAR, I suggest please
work on your systematic uncertainties which have significant
contributions. And please crosscheck from your end these results.
I understand that some of our yesterday's suggested todo list needs some
time to work.

Please send your preliminary draft of your HQ2022 presentation soon.

Besides, I have the following questions and suggestions on your
preliminary request slides.

Slide11:
_For hard core jets, do you perform jet-by-jet rho times jet area
subtraction?

 

_For hard core jet selection, have you checked with pT>1.5 GeV/c and 2.5
GeV/c? Do you have such plots for comparison like your right side plot? 

Slide16:
_Do you understand why your last bin is going down to negative for
hardcore only jet?
I would expect at high pT all these jets give the same v2 (or matched
jet and hardcore jets would be the same). 
Is this just statistical fluctuations? 

_Can you please show Delta phi distributions (like slide#13) of that pT
bin (where v2 is negative) for all three types of jets? 

Slide#17:
_ I like this plot to be "STAR Preliminary" with 5-40GeV/c pT range
instead of your slide14; but you can keep this slide#14's plot as a
backup. 
_ I would suggest the following cosmetic changes. 
1. Make STAR data points anything filled with red markers. 
2. Make ALICE markers with a lighter tone of green/gray color(make it a
bit transparent or all color gray such that it would not dominate over
StAR data point by look). In this current format, ALICE data points are
dominating to the eye. 


Thank you
Nihar



On 2022-10-05 11:20, Tristan Protzman wrote:
> Hi All,
>
> Thank you for the comments on my preliminary figure request.  I have
> made the requested changes to the plotting, reflected here:
> Preliminary Figure Request: Azimuthal Anisotropy of Jets in √(s_NN
> )=200 GeV Ru+Ru and Zr+Zr Collisions (bnl.gov) [2]
>
> To evaluate the magnitude of systematic errors, I plan to look at the
> following:
> * Tracking efficiency - how does my result change if I throw out 4% of
> tracks?  This will take a few days as I need to run over the data
> again
> * Effects of modulated background - How does the result change if I
> change or even remove the background modulation from the assumed 4%.
> This should be faster, I should be able to report on this tomorrow.
>
> I have also included the measured jet v2 for the population of all
> jets, hard cores only, and matched jets in a backup slide.  In general
> there is good agreement between the three.
>
> Cheers,
> Tristan
>
> On Tue, Oct 4, 2022 at 9:57 AM Tristan Protzman <tlp220 AT lehigh.edu>
> wrote:
>
>> Hi All,
>>
>> Here are my slides for my preliminary figure request.
>>
> https://drupal.star.bnl.gov/STAR/system/files/userfiles/6581/Protzman_JetV2_%20Preliminary_Figure_Request.pdf
>>
>> See you all shortly,
>>
>> Tristan
>>
>> On Sun, Oct 2, 2022 at 10:34 AM Nihar Sahoo via Star-hp-l
>> <star-hp-l AT lists.bnl.gov> wrote:
>>
>>> Hello HP folks,
>>>
>>> We will have a separate HP-pwg meeting this week on our reserved
>>> day
>>> (Tuesday) 4th Oct at 10 AM BNL time.
>>> Tristan Protzman requested to meet before Thursday (our usual PWG
>>> meeting time) because he wants to update his jet v2 results for
>>> HQ2022
>>> STAR preliminary. Hence due to his time constraint and to make
>>> Tristan
>>> happy, We plan to meet this Tuesday also this week.
>>> If anybody wants to discuss anything (which must be urgent) then
>>> we can
>>> allocate this Tuesday too; otherwise, we can meet Thursday (with a
>>>
>>> separate meeting announcement).
>>>
>>> HP-pwg weekly meeting Drupal page:
>>>
>>
> https://drupal.star.bnl.gov/STAR/pwg/Hard-Probes/Weekly-HP-PWG-meeting
>>>
>>> Zoom Meeting link:
>>>
>>
> https://bnl.zoomgov.com/j/1611419615?pwd=VW1hNm43ZDd5d2EvK2R4aEJsQ2ZNZz09
>>> [1]
>>>
>>> Meeting ID: 161 141 9615
>>> Passcode: 744968
>>>
>>> Thank you
>>> Barbara, Yi, Sooraj, Nihar
>>> _______________________________________________
>>> Star-hp-l mailing list
>>> Star-hp-l AT lists.bnl.gov
>>> https://lists.bnl.gov/mailman/listinfo/star-hp-l
>
>
> Links:
> ------
> [1]
> https://urldefense.com/v3/__https://bnl.zoomgov.com/j/1611419615?pwd=VW1hNm43ZDd5d2EvK2R4aEJsQ2ZNZz09__;!!P4SdNyxKAPE!AulmhgAy5Xz0XqpGUuYK1djv2jG5SWTEB1IumpHdbTS752yQ4P2x9cKCX0-KM_UEwy9EJvWg-mh1SK42YJCZYcs$
> [2]
> https://drupal.star.bnl.gov/STAR/system/files/Protzman_JetV2_%20Preliminary_Figure_Request_v2.pdf

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