STAR HardProbes PWG

[Nihar Sahoo <nihar AT rcf.rhic.bnl.gov>]

Hi Youqi,

My apologies for late response.

Thank you for your reply. Your replies sound reasonable to me.

Two additional question.

_On slide20:
As you mentioned in your reply #2 that you have used JP trigger.
Have you used the same trigger condition for PYTHIA, HERWIG simulations 
for calculating SS and OS jet fraction?

_Have you performed any study to know if this r_c observable depends on 
any trigger jet selection?
For example, instead of JP trigger jet, if you use inclusive jet or any 
higher energy trigger jet sample, does rc vs jet pT behavior, or value 
of rc, change depending on trigger jet selection?

Thank you
Nihar




On 2023-08-14 02:52, Youqi Song wrote:
> Hi Nihar,
>
> Thanks for the questions. I will try to answer them in this email.
>
> 1) Yes, I'm using PYTHIA+GEANT's mistagged distributions for this
> subtraction. I have checked the mistagged distributions in HERWIG+fast
> sim as well (slide 20), and they are consistent with PYTHIA's. I added
> a slide for comparison between data and PYTHIA+GEANT on slide 27 at
> https://drupal.star.bnl.gov/STAR/system/files/pwg_meeting_081023_updated_0813.pdf.
>
> 2) The rc observable has a bias from the jet patch trigger below jet
> pT of 20 GeV. In simulations, we can choose whether to implement the
> JP trigger or not, and look at the corresponding truth jets that are
> matched to the reconstructed jets. This can be seen from the second
> plot on slide 24, where the truth jet population below 20 GeV is
> affected by the trigger. We therefore decided to not report results
> below 20 GeV to avoid potential bias introduced by the trigger. This
> lower jet pT cutoff is also consistent with the lower jet pT cutoff in
> the other jet substructure measurements (such as the jet mass analysis
> by Isaac, the jet charge analysis by Grant, and the SD analyses by
> Monika).
>
> 3) Right now the binning in 30-40 GeV is limited by the statistical
> uncertainty of the embedding that is used for mistagged subtraction. I
> will look into the finer binning once we have the higher statistics
> embedding fully setup.
>
> Please let me know if these sound reasonable and/or if you have any
> other suggestions/followup!
>
> Best,
> Youqi
>
> On Fri, Aug 11, 2023 at 2:56 AM Nihar Sahoo <nihar AT rcf.rhic.bnl.gov>
> wrote:
>
> > Hello Youqi,
> >
> > Thank you for your nice study.
> > I was going through your correction procedure.
> >
> > a few follow up questions:
> >
> > 1) On slide8:
> https://drupal.star.bnl.gov/STAR/system/files/pwg_meeting_081023_new_0.pdf
> > As you are using PYTHIA models to subtract mistagged jet
> > contribution
> > which is a model dependent way, Could you please show the following
> > results to validate "Mistagged (fake) subtraction" procedure?
> >
> > It is important to show the comparison between each component of
> > your rc
> > observables of data and that in PYTHIA+GEANt simulation.
> > Like N_ss, N_os, and Jet pT dist. of data vs PYTHIA+GEANT.
> >
> > 2) Can you please show your rc results at lower Full Jet pT range?
> > For
> > example below jet pT < 20 GeV/c.  5 to 20 GeV/c range.
> >
> > 3) and is it possible to make your jet pT bins size a bit smaller,
> > for
> > example, 30-35 and 35-40 instead of 30-40 GeV/c. To know if there is
> > any
> > change in shape.
> >
> > Thank you
> > Nihar
> >
> > On 2023-08-09 23:03, Youqi Song wrote:
> > > Hi all,
> > >
> > > Please find my slides for tomorrow's meeting here:
> > > https://drupal.star.bnl.gov/STAR/blog/youqi/pwgmeeting081023-0
> > >
> > > Best,
> > > Youqi
> > >
> > > On Wed, Aug 9, 2023 at 12:43 PM Brennan Schaefer via Star-hp-l
> > > <star-hp-l AT lists.bnl.gov> wrote:
> > >
> > > > Hi Nihar, et al,
> > > >
> > > > I would like to show some embedding QA results tomorrow.
> > > >
> > > > thanks,
> > > >
> > > > b
> > > >
> > > > Brennan Schaefer
> > > >
> > > > On Tue, Aug 8, 2023 at 4:07 AM Nihar Sahoo via Star-hp-l
> > > > <star-hp-l AT lists.bnl.gov> wrote:
> > > >
> > > > > Hello All,
> > > > >
> > > > > We will have our HP-pwg meeting this Thursday (10th Aug) at 10
> > AM
> > > > > EDT.
> > > > > Let us know please if you want to present and discuss your
> > > > > analysis or
> > > > > any other business.
> > > > > Send your presentation slides a few hrs before the meeting,
> > > > > please.
> > > > >
> > > > > As QM2023 deadline is approaching, we request all PAs to update
> > us
> > > > > your
> > > > > status for your presentation/poster.
> > > > >
> > > > > HP working group weekly meeting info:
> https://drupal.star.bnl.gov/STAR/pwg/Hard-Probes/Weekly-HP-PWG-meeting
> > > > > Join ZoomGov Meeting
> https://bnl.zoomgov.com/j/1611419615?pwd=VW1hNm43ZDd5d2EvK2R4aEJsQ2ZNZz09
> > [1]
> > > > > [1]
> > > > >
> > > > > Meeting ID: 161 141 9615
> > > > > Passcode: 744968
> > > > >
> > > > > Regards,
> > > > > Isaac, Yi and Nihar
> > > > > _______________________________________________
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