sPHENIX discussion of physics

[Anthony Frawley <afrawley AT fsu.edu>]

Hi All,

Here are some notes from the meeting today.

Tony

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Munir Daradkeh: K0s for commissioning:

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New student, introducing himself. Will work on commissioning analysis using K0s decays, just starting.

There was a discussion about whether the K0s analysis should use KFParticle.

Jin: KFParticle is designed to do an analysis like this. Hijing production of K0s should be enough to test this without embedding.

Cameron: Confirmed that K0s is in the particle list.

There is a KFParticle Twiki page and an example in the analysis repository.

Dennis: Daniel Lis has configured KFParticle (at macro level) to do K0s and Lambda decays.

Ejiro: Any physics interest other than commissioning? Dennis: Possibly could use K0s as one of the HF decays? Need to understand the effect of flight times on efficiency.

Suggested that we form a Mattermost channel to discuss this analysis. Interest from Munir, Reese Boucher at FSU, and Colorado.

Discussion: It would be good to have a backup analysis that does not use KFParticle, so that problems during commissioning do not include problems with KFParticle (e.g.cuts). 

Antonio Carlos Oliveira da Silva:  D0 jet followup:

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Added D0 jets to node tree.

Implemented particle flow algorithm.

Major improvement in jet resolution!

JIn: Suggest making a draft PR to get it in coresoftware. In coresoftware it is harder for someone to break it than if it is analysis.

Jin: suggest changing barcode from HEPMC ID to G4Particle ID for tagging.

Xuan: Can identify the number of tagged jets / event? Not presently. Can implement.

Xuan: Want to map out history of D0. Do you have tracks and clusters correlated with KFParticle? Yes, this is possible to do.

Dennis: Particle Flow is not yet ready to work in AuAu environment, needs more development. Can Antonio come to jet group meeting to discuss? Yes.

Jakub K: REmoving background tracks inside the jet should be an option. Dennis: Yes, Jet group is a better forum for discussing that.

Joe Osborn; Presently, tracks are not projected to the calos for matching in the particle flow algorithm. This should be implemented, since code exists to do it.

Weihu Ma: Electron ID update:

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It was concluded that Weihu's simulations had some issue. He will regroup.

Zhaozhong Shi: EvtGen update:

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Jin: slide 13: For QA you only need to check the D0 decay daughters, not the rest of the chain. Then there should be no exceptions to conservation laws.

Jin: slide 10: The lifetime distribution is not exponential. Should be, if decay is in vacuum.

Cameron: Suggest removing the first few bins (near zero decay time) to improve the fit on slide 10.

Wei: This plot is an integral over a 2D distribution. Do the bins correspond to different areas? Would that explain the wrong extracted lifetime?

Cameron: Slide 9: Thomas Marshal introduced a truth info QA module into coresoftware in the summer. It does all but the branching ratio.

What is the relationship of this module to that? Should they be merged?

Zhaozhong: This QA module is private.

Jin: The PR needs a QA module, either yours, or merge it with the existing one.

Slide 14: Should add inclusive or semi-inclusive major decay channels.

Meeting change:

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Note that we move the TG meeting forward by one week from here on to avoid the existing clash with the PHENIX topical group meeting. So the next meeting is November 10, and we meet every two weeks after that.

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From: Anthony Frawley <afrawley AT fsu.edu>
Sent: Wednesday, November 2, 2022 1:56 PM
To: sphenix-hf-jets-l-bounces AT lists.bnl.gov <sphenix-hf-jets-l-bounces AT lists.bnl.gov>
Cc: Sphenix-upsilons-l AT lists.bnl.gov <Sphenix-upsilons-l AT lists.bnl.gov>; sphenix-physics-l AT lists.bnl.gov <sphenix-physics-l AT lists.bnl.gov>
Subject: Reminder: HF/Q topical group meeting tomorrow, Thursday November 3, at 10 am EDT

 

Dear friends,

 

Our joint HF/Quarkonium TG meeting will be tomorrow, Thursday,  at 10:00 AM ET. 

 

We have the following talks on the agenda:

• Introduction: co-convenors
• Brief status update on K0s (commissioning analysis) - Munir Daradek
  
• D0-jet follow up  - Antonio Carlos Oliveira da Silva
  
• Update on electron ID - Weihu Ma
  

 

Please join us via:

https://indico.bnl.gov/event/17549/

https://bnl.zoomgov.com/j/1613938007?pwd=QjYzUnpYQ2xNZWZLSy9qd3Z4dFpzZz09

 

We look forward to meeting you then.

 

Best regards

 

Cameron, Jin, Tony and Marzia