STAR Flow, Chirality and Vorticity PWG

[Rosi Reed <rosijreed AT lehigh.edu>]

Hi Zhenyu,

I'm a little confused, the weights that Isaac is using are the tile-by-tile EPD weights.  Would one use the weights that are calculated for flattening, etc, the EP as well?

The idea of this analysis is going into a poster and talk for the Hard Probes conference in 2 weeks, so it would be helpful if Isaac could get comments on a time scale earlier than a week.  At the very least, confirming the analysis procedures.  Right now he doesn't see a correlation in the TPC either - perhaps this is the weighting issue you mention.

Cheers,

Rosi

On Thu, Mar 16, 2023 at 10:43 PM zhchen via Star-fcv-l <star-fcv-l AT lists.bnl.gov> wrote:

Hi Isaac,

I would encourage you to present in next PWG meeting to have more
detailed discussion.
Based on my experience on a few event shape engineering analyses, the
definition of q2 is the magnitude of Q2  = Sum(w*exp(i2phi))/Sum(w). So
the denominator should include not only the multiplicity M but also the
other EPD weights.
Hope this could be helpful.

Cheers,
Zhenyu


在 2023-03-16 04:42，Mooney, Isaac via Star-fcv-l 写道：
> Hi FCV members,
>
> I’m a member of the HardProbes PWG, and I’ve been investigating some
> interesting behavior with q vectors as part of my analysis. I was
> splitting events into q2 classes, before seeing the plot I’m showing
> on slide 4 of the attached pdf, which raised the question of whether
> this is actually possible to do meaningfully.
> I was hoping to show the slides at the meeting today, but since it was
> canceled, I’m sending them here. If you have a minute, please take a
> look and let me know if you have any thoughts. To me the behavior is
> non-intuitive enough that it’s possible there’s a solution that is
> very obvious to an expert eye. And please let me know if anything in
> the slides is not clear and I would be happy to clarify it.
>
> I really appreciate any time you have to think about this!
> Best,
> Isaac
>
>
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Rosi Reed
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Lehigh University
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