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[Sphenix-maps-l] [minutes] bi-weekly heavy flavor topical group meeting

Chronological Thread  
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  • From: Hideki Okawa <Hideki.Okawa AT cern.ch>
  • To: sphenix-hf-jets-l ‎[sphenix-hf-jets-l AT lists.bnl.gov]‎ <sphenix-hf-jets-l AT lists.bnl.gov>
  • Cc: "sphenix-maps-l AT lists.bnl.gov" <sphenix-maps-l AT lists.bnl.gov>
  • Subject: [Sphenix-maps-l] [minutes] bi-weekly heavy flavor topical group meeting
  • Date: Tue, 29 Sep 2020 08:19:06 +0000

Welcome – Hideki, Jin

 

Join our studies and MatterMost chats: 

https://wiki.bnl.gov/sPHENIX/index.php/Heavy_Flavor_Topical_Group  

 

PAC meeting went well:

https://indico.bnl.gov/event/7881/  

Our efforts to enable the baseline data in the pp collisions is commended by the PAC. 

 

The next target for producing simulation results is the Collaboration Meeting in December. 

 


KFParticle - Cameron

Summary: The package is at the beta stage now. Testing the beta version and suggestions by the users are appreciated. Instructions are at: https://github.com/sPHENIX-Collaboration/analysis/blob/KFParticle/HF-Particle/KFParticle_sPHENIX/instructions/KFParticle.pdf

 

Ming: Do you require the PV? sPHENIX does not require the PV for the track reconstruction.

Cameron: No, also for the KFParticle. Constraints to the PV became an option now instead of being the default. DCA(PV chi2) is just a quality cut.

 

Yasser: Are B_s mesons assigned to the PV?

Cameron: By default, the head of the decay chain (e.g. a B_s0) is set to a PV. This can be disabled by setting the following flag in the Fun4All macro: kfparticle->constrainToVertex(false); [an updated answer from MatterMost]

 

Zhaozhong: Is the decay time distribution plotted properly?

Cameron: This is the ctau distribution in cm. Some checks still need to be done.

 

Hideki: Why do you get a negative decay time?

Cameron: This is just due to a resolution effect from prompt decays.

 

Ming: Do we have sufficient sets of MC samples?

Cameron: We currently have 4 sets of samples in the repository: D^0->Kpi, B_s->J/psi phi, B^0->D pi, Upsilon->B^0 B^0bar. (Please look at MatterMost for the actual coding instructions.)

 

Hideki: What is this bug in the truth matching?

Cameron: The truth matching crash seems to occur for some events when running through the event clusters. I was able to return the clusters associated to the truth track and found the crash wasn’t due to the true track. I think when the iterator progresses through the cluster map it finds something that it doesn’t like. I’ll try and get the print statements back up and running in the code (an updated answer from MatterMost)

 


D-meson correlation – Long

Summary: Added more details about the yield estimation and presented further plans

 

Hideki: Is the label correct for the right figure on p.5 and not flipped for the pT-cut dependencies? Why do the numbers increase with higher pT cut?

Long: The label is correct. It is the ratio to the number of triggered events and not the absolute numbers.

 

Xin, Yasser: What is the requirement of the associated D0? Triggering with a higher pT cut should select more hard scattering (i.e. high Q^2) and should increase the correlation. Ideally, the distributions should be around 1 in clean signals.

Long: I will investigate further in detail, including more checks on the eta and pT distributions.  

 

Yasser: How do you treat the effect of RAA in AuAu? Is the simple scaling from pp OK? Maybe some weighting is needed, since you will look into pT distributions

Long: We will think about how to consider the RAA effect.

 

Xin: What is the most challenging part?

Long: pp collision studies should not be a problem. In AuAu, full simulation is time consuming. We also need fast simulation. Also, the charm production rate is underestimated by a factor in HIJING.

Xin: Regarding fastsim, you should check that it reproduces fullsim. About HIJING, you should generate the signals with Pythia8 and embed HIJING rather than trying to do everything with HIJING. You can also make samples with several Pythia8 events overlaid + HIJING embedding.

 

 

D0 D0_bar separation - Thomas 

Summary: Updates on the separation of D0 and D0_bar at sPHENIX.

 

Slide 3:

Hideki: So, the D0-D0bar separation is much degraded with background?

Thomas: Yes, it seems so, but is to be investigated.

Ming: Are these from pp or AuAu?

Thomas: I will check the input files again.

 

Slide 5 and onwards:

Hideki: Which particle do red/blue lines correspond to?

Thomas: red->D0, blue->D0bar

 

Slide 5:

Hideki: The ROC curves are curling and sometimes have two false ID efficiencies for a fixed correct ID efficiency. How are they defined here?

Thomas: Each point corresponds to a dataset. I will add descriptions.

 



From: sPHENIX-HF-jets-l [sphenix-hf-jets-l-bounces AT lists.bnl.gov] on behalf of Hideki Okawa [Hideki.Okawa AT cern.ch]
Sent: Monday, September 28, 2020 10:17
To: sphenix-hf-jets-l ‎[sphenix-hf-jets-l AT lists.bnl.gov]‎
Cc: sphenix-maps-l AT lists.bnl.gov
Subject: [Sphenix-hf-jets-l] [Sept 28 Monday 7PM ET] bi-weekly heavy flavor topical group meeting

Dear all,

We will have our next HF topical group meeting
on Sep. 28, Monday at 7PM ET.


The agenda will cover:
- KFParticle update by Cameron Dean (LANL)
- D-meson correlation updates by Long Ma (Fudan)
- Quick updates on D0 D0bar separation by Thomas Marshall (UCLA)

Besides the meeting announcement, if you would like to
volunteer for any topic listed below or add any other
one, please let us know.

We look forward to talking to you all at the meeting.

Best regards,
Jin & Hideki


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