sPHENIX discussion of physics

[Anthony Frawley <afrawley AT fsu.edu>]

Hi All,

Here are my notes from the meeting this afternoon.

Tony

HF/Q topical group meeting January 27, 2023:

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Convener comments:

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Jin: The PR on the Evtgen decayer has been merged.

It is now the default decayer. Many thanks to Zhaozong for the great effort.

D0 Jet Update: Xuan Li

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Slide 7: Joe: What is a jet? How many constituents?

Xuan: D0 + at least one other particle.

Joe: Careful of claiming a jet at 2 GeV/C. Xuan: 2 GeV/c is for studies.

Would probably start physics at 5-7 GeV/c.

Xin: What is truth? Generator level, or truth for reconstructed particles?

Truth for reconstructed particles.

What effect does tracking efficiency have on momentum scale?

Xuan: Have to study effect of tracking efficiency. Also, no distortions yet.

Cameron: You can get down to 5-7 GeV/c in pp, but what about AuAu?

Xuan: Under study. It would be helpful to have D0 signals in Hijing events.

Cameron: We have 22M minbias Hijing events.

Xuan: After filtering for D0's, will not have enough events from that.

Jin: Remember D0 will scale in AuAu with Ncoll. But may have to do embedding.

Jin: Suggest to double check with inclusive jets what the resolution looks like as a sanity check.

Jakub: From a cc_bar MC production of 1M events, got 50,000 truth jets and 300 reco jets, ~ 1.5%.

Cameron: Inclusive D0 efficiency in pp was 13.4%, with just baseline cuts.

Difference from Jakub's number of 1.5% should be understood.

Commissioning discussion: Led by Cameron

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For commissioning, we expect to look at:

     Ks, Lambda, D0, Y (&jets?).

The analysis note released in the last few weeks is for pp events.

We need to start looking at AuAu events.

Zhaozhong: Worked in Ks analysis in AuAu for STAR.

Zhaozhong will show some slides on cuts at the meeting in 2 weeks.

Joe: Maybe make a module that filter resonance events in a selected mass region?

Cameron: Experience is that generic cuts give too many candidates.

Thomas Marshal worked in a filter module in the January Workfest.

Marzia: Need CEMC calibration for electrons.

Marzia: Can we get realistically distorted, misaligned data to try analysis on?

Tony: Noy yet. The tracking group hopes to have machinery in place for that by the March workfest.

CEMC de-calibration code would be a good contribution from others.

Wei: What about alignment?

Tony: The machinery for implementing alignment constants is in place.

We would like to collect all of the survey alignment data in a format that it can be read into the tracking reconstruction chain. It would be great if subsystems can assign someone as point person for this.

  INTT: Joseph B. is working on this and is in contact with tracking experts.

  MVTX: Cameron: chip positions in staves have been surveyed. Will bring it up in Monday meeting.

  TPC: We need a point person.

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From: sPHENIX-HF-jets-l <sphenix-hf-jets-l-bounces AT lists.bnl.gov> on behalf of Anthony Frawley via sPHENIX-HF-jets-l <sphenix-hf-jets-l AT lists.bnl.gov>
Sent: Thursday, January 26, 2023 10:20 PM
To: Huang, Jin via sPHENIX-HF-jets-l <sphenix-hf-jets-l AT lists.bnl.gov>; sphenix-physics-l AT lists.bnl.gov <sphenix-physics-l AT lists.bnl.gov>; Sphenix-upsilons-l AT lists.bnl.gov <Sphenix-upsilons-l AT lists.bnl.gov>
Subject: [Sphenix-hf-jets-l] HF/Q topical group meeting tomorrow, Friday January 27, at 3 pm EDT

 

Hi All,

We will have our HF/Q topical group meeting tomorrow, January 27, at 3 pm ET. The indico and zoom links are:

https://indico.bnl.gov/event/18141/

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

We have the following talks on the agenda:

• D0 Jet update:   Xuan Li
• Commissioning discussion:  Conveners
• Reduced DST discussion 

Best regards

Cameron, Jin, Tony and Marzia