STAR Flow, Chirality and Vorticity PWG

["Robertson, Charles William" <rober558 AT purdue.edu>]

Hey Diyu,

Instead of "F(m) * (<.> real / <.> idea-bkg) = <.> real / <.> mix" we mean:

F(m) * (<.> real / <.> real-bkg) = <.> real / <.> mix

Both <.> real and <.> real-bkg are from a real event and are affected by efficiency/acceptance. <.> real-bkg may not be 1/3 because of these effects.

We are saying that they are both affected by efficiency/acceptance in nearly the same way, so that these effects cancel in the ratio. In other words we’re assuming real/real-bkg = true/true-bkg. We’ll definitely check this with simulations, on our todo list. 

Then, F(m) is an overall factor on this ratio which accounts for the difference between <.> real-bkg and <.> mix. 

-CW

---

From: dshen <dshen AT rcf.rhic.bnl.gov>
Sent: Saturday, April 8, 2023 10:10 AM
To: dshen <dshen AT rcf.rhic.bnl.gov>; STAR Flow, Chirality and Vorticity PWG <star-fcv-l AT lists.bnl.gov>
Cc: Robertson, Charles William <rober558 AT purdue.edu>
Subject: Re: [Star-fcv-l] FCV PWG meeting on 05/April/2023 Wed. 9:30 AM EDT

 

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


Hi CW,

I think I kind of understand what you did now.
The <.> obs you mean with prefect acceptance, and you construct
F(m) * (<.> real / <.> idea-bkg) = <.> real / <.> mix
The <.> idea-bkg in the case of perfect acceptance should be 1/3.
Is it right?

Thanks,
Diyu

On 2023-04-08 11:34, dshen via Star-fcv-l wrote:
> Hi CW,
>
> I am confused by <.> real, does it stand for real event or perfect
> acceptance? In order to keep us on the same page, I propose to use
> "<.> real" to denote real event and "<.> true" to denote perfect
> acceptance.
>
> Let me assume your <.> real means perfect acceptance according to the
> context, so
> "<. > real phi / <.> real bkg = <.> obs phi / <.>obs bkgd"
> means your are assuming the F(m) for phi meson and background pairs
> are the same, but it may not be true because the kinematics could be
> different between phi and background.
>
> Even if you have strict control on the kinematics, I still couldn't
> get your fitting function. Is it an  empirical function? If not, could
> you give me few middle steps so I can get relief?
>
> Thanks,
> Diyu
>
>
> On 2023-04-08 03:09, Robertson, Charles William wrote:
>> Hey Diyu,
>>
>>  We are saying the real background is not perfectly described by the
>> mixed events, and this imperfection gives an overall factor of F(m).
>> This F(m) is nearly 1.
>>
>>  We are assuming that <. > real phi / <.> real bkg = <.> obs phi /
>> <.>obs bkgd.
>>
>>  <.> is cos theta star sqrd.
>>
>>  Let me know if you have any other questions,
>>  -CW
>>
>> -------------------------
>>
>> From: dshen <dshen AT rcf.rhic.bnl.gov>
>> Sent: Friday, April 7, 2023 11:29 AM
>> To: Robertson, Charles William <rober558 AT purdue.edu>
>> Cc: STAR Flow, Chirality and Vorticity PWG <star-fcv-l AT lists.bnl.gov>
>> Subject: Re: [Star-fcv-l] FCV PWG meeting on 05/April/2023 Wed. 9:30
>> AM EDT
>>
>> ---- External Email: Use caution with attachments, links, or sharing
>> data ----
>>
>> Hi CW,
>>
>> Thanks for your prompt reply.
>> I actually did similar derivations, based on my understanding, and I
>> found finally there is a disconnection between the fitting functions.
>> See Eq.7 of
>> https://drupal.star.bnl.gov/STAR/system/files/invMass4ml.pdf [1]
>> The function form of my Eq.7 is quite different from your fitting
>> function, and I can't find out why is it...
>> Could you provide more middle steps to guide me to your fitting
>> function?
>>
>> Thanks,
>> Diyu
>>
>> On 2023-04-07 04:59, Robertson, Charles William wrote:
>>> Hello Diyu,
>>>
>>>  Thank you for your question. I made two slides explaining this in
>>> some more detail.
>>>  They can be found here:
>>> https://drupal.star.bnl.gov/STAR/system/files/cos_theta_fit.pdf
>>>
>>>  Let me know if you have any other questions,
>>>  -CW
>>>
>>> -------------------------
>>>
>>> From: dshen <dshen AT rcf.rhic.bnl.gov>
>>> Sent: Thursday, April 6, 2023 10:08 AM
>>> To: Robertson, Charles William <rober558 AT purdue.edu>; STAR Flow,
>>> Chirality and Vorticity PWG <star-fcv-l AT lists.bnl.gov>
>>> Cc: 'subhash' <subhash AT rcf.rhic.bnl.gov>
>>> Subject: Re: [Star-fcv-l] FCV PWG meeting on 05/April/2023 Wed. 9:30
>>> AM EDT
>>>
>>> ---- External Email: Use caution with attachments, links, or sharing
>>> data ----
>>>
>>> Hi CW,
>>>
>>> I am interested in this inv-mass method, maybe because I am doing
>> the
>>> J/psi spin alignment analysis. So I recalled myself today your
>>> presentation, and I found I have a terrible memory. Could you
>> explain
>>> again why/how the fitting function f in slide 4 is derived? and why
>>> <cos^2 theta*> = (1+\rho_fit)/3 ?
>>>
>>> Thank you!
>>>
>>> Diyu
>>>
>>> On 2023-04-05 23:50, Robertson, Charles William via Star-fcv-l
>> wrote:
>>>> Hello all,
>>>>
>>>>  I updated my slides based on some of the quick comments during the
>>>> meeting.
>>>>  They can be found here:
>>>>
>>>
>> https://drupal.star.bnl.gov/STAR/system/files/PhiMesonFCVMeeting040523_2.pdf
>> [2]
>>> [1]
>>>>
>>>>
>>>>  S6: Statistical error bars are now correctly plotted, only an
>> issue
>>>> with plotting
>>>>  S14: Cos Theta Star Sqrd Real/Mix Ratio for an extended invariant
>>>> mass range
>>>>  S15: Some example fits for the yield method at 200 GeV, using
>>>> different polynomial backgrounds. Slight variation in yield
>>> parameter
>>>> "A".
>>>>
>>>>  Thanks,
>>>>  -CW
>>>>
>>>> -------------------------
>>>>
>>>> From: Star-fcv-l <star-fcv-l-bounces AT lists.bnl.gov> on behalf of
>>>> Robertson, Charles William via Star-fcv-l
>> <star-fcv-l AT lists.bnl.gov>
>>>> Sent: Wednesday, April 5, 2023 9:28 AM
>>>> To: 'STAR Flow, Chirality and Vorticity PWG'
>>>> <star-fcv-l AT lists.bnl.gov>; 'subhash' <subhash AT rcf.rhic.bnl.gov>
>>>> Subject: Re: [Star-fcv-l] FCV PWG meeting on 05/April/2023 Wed.
>> 9:30
>>>> AM EDT
>>>>
>>>>               ---- External Email: Use caution with attachments,
>>> links, or
>>>> sharing data ----
>>>>
>>>>  Hello,
>>>>
>>>>  My slides for today can be found here:
>>>>
>>>
>> https://drupal.star.bnl.gov/STAR/system/files/PhiMesonFCVMeeting040523_1.pdf
>> [3]
>>> [2]
>>>>
>>>>
>>>>  Thank you,
>>>>  -CW
>>>>
>>>> -------------------------
>>>>
>>>> From: Star-fcv-l <star-fcv-l-bounces AT lists.bnl.gov> on behalf of
>>>> Xionghong via Star-fcv-l <star-fcv-l AT lists.bnl.gov>
>>>> Sent: Tuesday, April 4, 2023 8:52 PM
>>>> To: 'STAR Flow, Chirality and Vorticity PWG'
>>>> <star-fcv-l AT lists.bnl.gov>; 'subhash' <subhash AT rcf.rhic.bnl.gov>
>>>> Subject: Re: [Star-fcv-l] FCV PWG meeting on 05/April/2023 Wed.
>> 9:30
>>>> AM EDT
>>>>
>>>> ---- External Email: Use caution with attachments, links, or
>> sharing
>>>> data ----
>>>>
>>>> Dear Subhash,
>>>>
>>>> My slides for the meeting tomorrow can be found at the link
>>>>
>>>
>> https://drupal.star.bnl.gov/STAR/system/files/PWG_LightNucleiv1atBES2_Xiongh
>> [4]
>>> [3]
>>>> ong_20230405.pdf.
>>>>
>>>> Thanks and best regards,
>>>> Xionghong
>>>>
>>>>> -----Original Message-----
>>>>> From: star-fcv-l-bounces AT lists.bnl.gov
>>>> [mailto:star-fcv-l-bounces AT lists.bnl.gov]
>>>>> On Behalf Of Xionghong via Star-fcv-l
>>>>> Sent: Tuesday, April 4, 2023 9:50 AM
>>>>> To: 'subhash' <subhash AT rcf.rhic.bnl.gov>; 'STAR Flow, Chirality
>> and
>>>> Vorticity
>>>>> PWG' <star-fcv-l AT lists.bnl.gov>
>>>>> Subject: Re: [Star-fcv-l] FCV PWG meeting on 05/April/2023 Wed.
>>> 9:30
>>>> AM
>>>> EDT
>>>>>
>>>>> Dear Subhash,
>>>>>
>>>>> I would like to present light nuclei v1 measurements at 14.6 GeV
>>> and
>>>> 19.6
>>>> GeV.
>>>>> Please add me to the agenda. I will post my slides later. Thanks.
>>>>>
>>>>> Best regards,
>>>>> Xionghong He
>>>>>
>>>>> > -----Original Message-----
>>>>> > From: star-fcv-l-bounces AT lists.bnl.gov
>>>>> [mailto:star-fcv-l-bounces AT lists.bnl.gov]
>>>>> > On Behalf Of subhash via Star-fcv-l
>>>>> > Sent: Monday, April 3, 2023 9:55 PM
>>>>> > To: STAR Flow, Chirality and Vorticity PWG
>>>> <star-fcv-l AT lists.bnl.gov>
>>>>> > Subject: [Star-fcv-l] FCV PWG meeting on 05/April/2023 Wed. 9:30
>>>> AM
>>>>> > EDT
>>>>> >
>>>>> > Dear All,
>>>>> >
>>>>> > We shall have our weekly FCV PWG meeting this Wednesday
>>>>> > (05/April/2023) at
>>>>> > 9:30 AM EDT. If you would like to present please let us know.
>>>> Please
>>>>> > try
>>>>> posting
>>>>> > your slides by Tuesday. The agenda will be collected at:
>>>>> > https://drupal.star.bnl.gov/STAR/blog/jjiastar/bulkcorr
>>>>> >
>>>>> > Zoom details are copied below.
>>>>> >
>>>>> > Thanks and regards,
>>>>> > Prithwish, Zhenyu and Subhash
>>>>> >
>>>>> >
>>>>> > ZOOM LINK FOR FCV MEETING:
>>>>> > Join ZoomGov Meeting
>>>>> >
>>>>>
>>>>
>>>
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>> [5]
>>> [4]
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>> https://urldefense.com/v3/__https://bnl.zoomgov.com/j/1612377416?pwd=V
>> [5]
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>>>
>>> Links:
>>> ------
>>> [1]
>>>
>> https://drupal.star.bnl.gov/STAR/system/files/PhiMesonFCVMeeting040523_2.pdf
>> [2]
>>> [2]
>>>
>> https://drupal.star.bnl.gov/STAR/system/files/PhiMesonFCVMeeting040523_1.pdf
>> [3]
>>> [3]
>>>
>> https://drupal.star.bnl.gov/STAR/system/files/PWG_LightNucleiv1atBES2_Xiongh
>> [4]
>>> [4]
>>>
>> https://urldefense.com/v3/__https://bnl.zoomgov.com/j/1612377416?pwd=V
>> [5]
>>> [5]
>>>
>> https://urldefense.com/v3/__https://bnl.zoomgov.com/u/abVqdu5fbU__;!!P
>> [6]
>>
>>
>> Links:
>> ------
>> [1] https://drupal.star.bnl.gov/STAR/system/files/invMass4ml.pdf
>> [2]
>> https://drupal.star.bnl.gov/STAR/system/files/PhiMesonFCVMeeting040523_2.pdf
>> [3]
>> https://drupal.star.bnl.gov/STAR/system/files/PhiMesonFCVMeeting040523_1.pdf
>> [4]
>> https://drupal.star.bnl.gov/STAR/system/files/PWG_LightNucleiv1atBES2_Xiongh
>> [5]
>> https://urldefense.com/v3/__https://bnl.zoomgov.com/j/1612377416?pwd=V
>> [6]
>> https://urldefense.com/v3/__https://bnl.zoomgov.com/u/abVqdu5fbU__;!!P
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