STAR Flow, Chirality and Vorticity PWG

["Wang, Fuqiang" <fqwang AT purdue.edu>]

Hi Diyu,

What you wrote is just another way to say that the physics quantity in 
question is within the min and max of (def. - |def.-sys.|,  def. + 
|def.-sys.|), respectively. In such a case, one would quote a sigma of 
2*|def.-sys.|/sqrt(12) = |def.-sys.|/sqrt(3). The essential point is to 
demonstrate to reasonable confidence that this is indeed the maximum syst. 
variation in the result.

Best regards,
Fuqiang

> On Dec 7, 2023, at 6:32 AM, dshen via Star-fcv-l <star-fcv-l AT lists.bnl.gov> 
> wrote:
>
> ---- External Email: Use caution with attachments, links, or sharing data 
> ----
>
>
> Hi Fuqiang, Zhiwan and all,
>
> It was a inspiring discussion on the systematic uncertainty calculations
> yesterday, it pushes me to think.
> I tend to agree with Zhiwan and what the blind-analysis did, i.e. use
> denominator of 1/sqrt(12).
> The argument was that one shouldn't divide the variation by 1/sqrt(12)
> because the variation isn't proved to be the maximum - minimum, I think
> there is a misunderstanding of the reason behind it.
> It isn't based on the assumption that the variation is maximum -
> minimum, the underlying assumption is that the true value falls within
> "default cut" +- "variation".
> Let's take an example, say, the default cut is DCA<2, and the systematic
> cut is DCA<1.
> The assumption is that the non-biased value is in the interval of (def.
> - |def.-sys.|,  def. + |def.-sys.|), and it can be any value in that
> interval with equal probability (uniform distribution) assuming we don't
> have any pre-knowledge to the best position. That's the reason of why
> people assign |def.-sys.|/sqrt(12) as 1 sigma and use two-side band.
> It hasn't to be the maximum - minimum, although it isn't incorrect
> technically to use larger uncertainty, say, use Dca<0.1 to Dca<100.  But
> I think the principal is to provide the best estimate instead of the
> most conservative value.
> What variation can be considered as reasonable? I think it is based on
> experience and common sense to a specific physics topic. For CME study,
> like what Zhiwan did, it is reasonable to assume the non-biased value
> falls with in DCA<2 +- |DCA<2 - DCA<1|, for example.
>
> That's my two cents.
>
> Best,
> Diyu
>
>
>
>> On 2023-12-06 05:10, Zhiwan Xu via Star-fcv-l wrote:
>> Dear Conveners,
>> I would like to update the paper proposal on the CME search in STAR
>> BES-II.
>> Please kindly add me to the schedule.
>>
>> The paper proposal webpage:
>>
>> https://drupal.star.bnl.gov/STAR/blog/zhiwanxu/Paper-Proposal-Search-Chiral-Magnetic-Effect-RHIC-Beam-Energy-Scan-II
>> The slides:
>>
>> https://drupal.star.bnl.gov/STAR/system/files/paper_proposal_CME_BESII_v2.pdf
>>
>> Best,
>> Zhiwan
>>
>> ------------------------------------
>> Zhiwan Xu,
>> Department of Physics and Astronomy, UCLA
>> zhiwanxu AT physics.ucla.edu
>>
>> ----- Original Message -----
>> From: "subhash via Star-fcv-l" <star-fcv-l AT lists.bnl.gov>
>> To: "STAR Flow, Chirality and Vorticity PWG" <star-fcv-l AT lists.bnl.gov>
>> Cc: "subhash" <subhash AT rcf.rhic.bnl.gov>
>> Sent: Sunday, December 3, 2023 11:21:34 PM
>> Subject: [Star-fcv-l] FCV PWG meeting on 06/December/2023 Wed. 9:30 AM
>> EDT
>>
>> Dear All,
>>
>> We shall have our weekly FCV PWG meeting this Wednesday (06/Dec/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
>> https://urldefense.com/v3/__https://bnl.zoomgov.com/j/1612377416?pwd=V3kvcnN5ZTRLVEc4U01QWUUycDQ1UT09__;!!P4SdNyxKAPE!Av9BM9pZUBzjZ_00gC1v6T-rpsdGpwGXddNo2NvBobwjtpFEHdX8vla8TPZfmG4ld-LS-FpqRe7vqLmI9mb3UG7nFqyunx-QfA$
>>
>> Meeting ID: 161 237 7416
>> Passcode: 106847
>>
>> One tap mobile
>> +16692545252,,1612377416#,,,,*106847# US (San Jose)
>> +16468287666,,1612377416#,,,,*106847# US (New York)
>>
>> Dial by your location
>>         +1 669 254 5252 US (San Jose)
>>         +1 646 828 7666 US (New York)
>>         +1 551 285 1373 US
>>         +1 669 216 1590 US (San Jose)
>> Meeting ID: 161 237 7416
>> Passcode: 106847
>> Find your local number:
>> https://urldefense.com/v3/__https://bnl.zoomgov.com/u/abVqdu5fbU__;!!P4SdNyxKAPE!Av9BM9pZUBzjZ_00gC1v6T-rpsdGpwGXddNo2NvBobwjtpFEHdX8vla8TPZfmG4ld-LS-FpqRe7vqLmI9mb3UG7nFqxQ4jG3og$
>>
>> Join by SIP
>> 1612377416 AT sip.zoomgov.com
>>
>> Join by H.323
>> 161.199.138.10 (US West)
>> 161.199.136.10 (US East)
>> Meeting ID: 161 237 7416
>> Passcode: 106847
>> _______________________________________________
>> Star-fcv-l mailing list
>> Star-fcv-l AT lists.bnl.gov
>> https://lists.bnl.gov/mailman/listinfo/star-fcv-l
>> _______________________________________________
>> Star-fcv-l mailing list
>> Star-fcv-l AT lists.bnl.gov
>> https://lists.bnl.gov/mailman/listinfo/star-fcv-l
> _______________________________________________
> Star-fcv-l mailing list
> Star-fcv-l AT lists.bnl.gov
> https://lists.bnl.gov/mailman/listinfo/star-fcv-l