STAR Flow, Chirality and Vorticity PWG

[Jiangyong Jia <jiangyong.jia AT stonybrook.edu>]

Dear Yicheng,

Could I ask what do you mean by true flow In slide 13 of the backup in the following PWGC talk? There are different method of estimate for flow, I do not see one can tell which one is true which one is not.  The fact that standard and two-subevent method give you the same ratio, suggest non-flow only comes in as a small dilution effect and can not change the isobar ratio a lot.

My point is that different methods extract different flow signal due to significant flow decorrelation effects in medium size system, so it is not very surprising one get somewhat different answer.  But I caution that you extensive non-flow subtraction method might introduce additional biases, i.e if  the method somehow removes a different amount of non-flow or even removes some flow signal. Also there are decorrelation effects which you might introduce method dependencies.  So I disagree with the conclusion of slide 13. 

By the way in a recent AMPT study (2301.01294), we do find flow contains a significant component delta that is uncorrelated with participant eccentricity in both RHIC and LHC, which serves to dilute the response to nuclear deformation effects.  However, we do not interpret this component as non-flow due to its relative mild dependence with Nch, and instead we argue there is a component of flow that is not captured by the PP due to subnucleon fluctuations or final state dynamical effects. 

Thanks,

Jiangyong

https://drupal.star.bnl.gov/STAR/system/files/IsobarNfBkg_PwgcPreview_v5.pdf

On 1/30/23 11:55 AM, Feng, Yicheng via Star-fcv-l wrote:

        Hi FCV convenors,
      
        
      
      
        We presented a paper proposal in the FCV meeting last week for
        our isobar background baseline study.
      
        As the next step, I'd like to request a PWGC preview for that.
      
        
      
      
        The slides presented last Wednesday can be found through the
        link below:
      
        https://drupal.star.bnl.gov/STAR/system/files/PPRP20230125_v2.pdf
      
      
        I wonder what else we need to prepare for this preview request.
      
        
      
      
        Please let me know if you have any comments or need
        any additional information.
      
        
      
      
        Thank you,

Yicheng for the PAs

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