STAR Flow, Chirality and Vorticity PWG

["Tang, Aihong" <aihong AT bnl.gov>]

Hi CW,

I wanted to follow up our discussion from Wednesday. 

From reviewing your slides (https://drupal.star.bnl.gov/STAR/system/files/SpinAlignmentFCV041724__.pdf), my understanding is that you formed two kaon groups, one simulated from the decay of phi with a characteristic pt and rapidity, and the other consisting of background kaons. For the former group, there is no eta cut, meaning there is no loss due to finite acceptance in eta. However, for the latter, the eta cut is applied as their kinematics are matched to real data (which is with eta cut). Following this, you rotated kaons in both groups in the transverse plane, calculated <cos^2 theta*> for each group, and then took the ratio, claiming it as the correction factor on <cos^2 theta*>, correct ?

Your slides provide a clear overview of what you did, but I'm interested in understanding the rational behind each step. A comprehensive derivation would be helpful to clarify this further.  

For instance, could you elaborate on why you believe a rotation in the transverse plane would effectively generate "background truth", especially considering that in a realistic scenario, a daughter particle can move in any direction, not just restricted to the transverse plane ? Why you don't worry that a rotation in the transverse plane is an _artificial_ distortion of rho_00 ?  Additionally, I'd like to understand the reasoning behind your final step of multiplying by the ratio to obtain the correct <cos^2 theta*>. Why is it a simple multiplication by the ratio instead of a simple addition of the difference (you are probably right on this point, but I'd like to see a derivation for it)? 

Having a complete derivation alongside a breakdown of each term or component corresponding to what you measure would greatly assist in our understanding. Even as someone who considers themselves as expert, I'm finding it challenging to follow the progress, so any clarification would be beneficial. If anyone else feels they can understand and explain it more clearly, I'd greatly appreciate their input too.

Lastly, I noticed a significant difference in your correction factor if compared to one of your previous presentations (slide 9 and 10 in the link below)

https://drupal.star.bnl.gov/STAR/system/files/FCV081623_5.pdf

In these slides, your correction factor (green/cyan) differs significantly from what you presented on Wednesday, particularly at larger InvMass (~1.04-1.08). What is the cause of it ?

Thank you.

Aihong

On Apr 17, 2024, at 9:25 AM, Robertson, Charles William via Star-fcv-l <star-fcv-l AT lists.bnl.gov> wrote:

Hello Convenors,

My slides for today can be found here:

https://drupal.star.bnl.gov/STAR/system/files/SpinAlignmentFCV041724__.pdf

Thanks,

-CW

---

From: Star-fcv-l <star-fcv-l-bounces AT lists.bnl.gov> on behalf of Cameron Racz via Star-fcv-l <star-fcv-l AT lists.bnl.gov>
Sent: Tuesday, April 16, 2024 10:16 PM
To: STAR Flow, Chirality and Vorticity PWG <star-fcv-l AT lists.bnl.gov>
Cc: Cameron Racz <cracz001 AT ucr.edu>
Subject: Re: [Star-fcv-l] FCV PWG meeting on 17/April/2024 Wed. 9:30 AM EDT

 

---- External Email: Use caution with attachments, links, or sharing data ----


Hello Conveners,

My slides for the meeting can be found at this link

https://nam04.safelinks.protection.outlook.com/?url="https%3A%2F%2Fdrupal.star.bnl.gov%2FSTAR%2Fblog%2Fcracz%2FProton-Purity-Results-FXT-Energies-Part-3&data=05%7C02%7Crober558%40purdue.edu%7Cef41a2124ea045bd955808dc5e84815d%7C4130bd397c53419cb1e58758d6d63f21%7C0%7C0%7C638489170418467690%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C0%7C%7C%7C&sdata=8%2FFP%2Fodot1s3wZfRhik8lKpsqTg00O5bKJ8u8YgaAts%3D&reserved=0

Cameron Racz
Ph.D. Candidate
Heavy-ion Physics Group
University of California, Riverside






> On Apr 15, 2024, at 10:20 PM, Cameron Racz <cracz001 AT ucr.edu> wrote:
>
> Hello conveners,
>
> I would like to give another update on "Proton purity for v3 at FXT energies – Part 3”. I will send out the link to slides later.
>
> Thank you,
>
> Cameron Racz
> Ph.D. Candidate
> Heavy-ion Physics Group
> University of California, Riverside
>
>
>
>
>
>
>> On Apr 14, 2024, at 11:00 PM, subhash via Star-fcv-l <star-fcv-l AT lists.bnl.gov> wrote:
>>
>> Dear All,
>>
>> We shall have our weekly FCV PWG meeting this Wednesday (17/Apr/2024) at 9:30 AM EDT. If you wish to present please let us know. The agenda will be collected at: https://nam04.safelinks.protection.outlook.com/?url="https%3A%2F%2Fdrupal.star.bnl.gov%2FSTAR%2Fblog%2Fjjiastar%2Fbulkcorr&data=05%7C02%7Crober558%40purdue.edu%7Cef41a2124ea045bd955808dc5e84815d%7C4130bd397c53419cb1e58758d6d63f21%7C0%7C0%7C638489170418474260%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C0%7C%7C%7C&sdata=SCSx6%2FGL2ExLmn1jsq%2FB1h3Ll8BRs%2BPFjd4pWnIpxn4%3D&reserved=0
>> Please send us your slides by Tuesday. Zoom details are copied below.
>>
>>
>> Please take a note of the STAR internal deadlines for CPOD and SQM. Presenters are requested to give regular updates in the PWG.
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>>    - SQM presentations due to PWG by May 20. New preliminary approvals should happen the week of May 13
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>>
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>> Prithwish, Zhenyu and Subhash
>>
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