STAR HardProbes PWG

["Ma, Rongrong" <marr AT bnl.gov>]

Hello Tristan

Thanks for looking into this quickly. 

Shengli's study shows that more than 50% of the v2 signal observed at 3-4 GeV/c is due to non-flow effect. After non-flow subtraction, the real v2 signal decreases with pT above 3 GeV/c, while your result shows a clear increasing trend. If I follow the trend of Shengli's result, the real v2 could be very small at high pT. So, I think we probably should at least label your plot as "v_2^obs", and state clearly that the non-flow contribution could be very large and has not been subtracted yet. This also raises the question of how much non-flow contamination is there in your Isobar results. 

Best

Rongrong

On Aug 29, 2023, at 12:03 AM, Tristan Protzman <tlp220 AT lehigh.edu> wrote:

Hi Rongrong,

I have managed to throw together a quick v2 on part of the data down to 0.5 GeV, see slide 16 of https://drupal.star.bnl.gov/STAR/system/files/preliminary_figure_request_OO_v2.pdf.  I believe the open blue squares in Shengli's results are the closest method to what I am using, where we see general agreement interpolating between the 20-40% and 40-60% with the non-subtracted EPD based method.  

Cheers,

Tristan 

On Aug 28, 2023, at 12:10 PM, Ma, Rongrong via Star-hp-l <star-hp-l AT lists.bnl.gov> wrote:

Hello Tristan

I would like to follow up on the comment I brought up during the PWG meeting about the single track v2, which if I remember correctly is about 0.15 at 4 GeV/c. On the other hand, slide 9 of https://drupal.star.bnl.gov/STAR/files/OO-ShengliHuang-QM2023_2.pdf shows that charged hadron v2 is about 0.075 at 2.5 GeV/c in 20-40% centrality. Have you looked at single track v2 down to say 2-3 GeV/c, and check if your results are consistent with Shengli's? Or at least we should put both results together and see if we have a consistent picture. 

Thanks. 

Best

Rongrong

On Aug 25, 2023, at 4:33 AM, webmaster--- via Star-hp-l <Star-hp-l AT lists.bnl.gov> wrote:

Dear Star-hp-l AT lists.bnl.gov members,

Tristan Protzman (tlp220 AT lehigh.edu) has submitted a material for a review,  
please have a look:
https://drupal.star.bnl.gov/STAR/node/64873

Deadline: 2023-09-03
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