sPHENIX discussion of physics

[Anthony Frawley <afrawley AT fsu.edu>]

Here are the notes from the HF/Q meeting on January 31.

Tony

Charles Hughes: Low pT Lambda-C reconstruction studies:

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Jin: Slide 8 - Using the truth-reco map.

The underlying code that makes the truth-reco map is in the SvtxEvaluator. Each reconstructed track is checked for a matching truth track. The yop right plot is for all matched reconstructed tracks.

Xin: Slide 9 - what cuts are used here?

The efficiency is just the plot on the top right of slide 8 (reco-matched protons), divided by the plot on the bottom left of slide 8 (truth protons).

The truth info is for tracks from truth Lambda-C vertices only.

Default track cuts for the reco tracks, all tracks have silicon seeds. These are from the HFTrackEfficiency module, not from KFP.

Suggestion: Double-check what cuts are used at all stages and report those.

Slide 11 discussion: Difficult to draw a conclusion.

Are the truth tracks reconstructable?

Need to define efficiency criteria clearly.

Jin: What fraction of decays go through resonances?

For example, excited states of the Lambda. Are they in the simulation? Cameron: yes.

Xin: What is the track efficiency for primary particles? Do not have that.

Suggestion is to separate acceptance from efficiency to better understand the performance.

Note that the evaluator can provide information for truth tracks about the number of layers in each detector.

Jakub: Suggest using binomial errors for efficiency.

Xuan Li and Jakub Kvapil: HF jet reco, impact of latest software changes:

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Xin: Slide 5 - what are the tails? Misidentified pi and K cases.

Jin: Slide 9: Rather than a new production, it should be possible to track down the bug by looking at the event record.

Antonio: What version of ResonanceJetTagging is used?

Discussion: Antonio will update the code - did not think anyone else was using it.  Has some ideas what may be the problem.

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From: sPHENIX-HF-jets-l <sphenix-hf-jets-l-bounces AT lists.bnl.gov> on behalf of Cameron Thomas Dean via sPHENIX-HF-jets-l <sphenix-hf-jets-l AT lists.bnl.gov>
Sent: Tuesday, January 30, 2024 11:28 PM
To: sphenix-physics-l AT lists.bnl.gov <sphenix-physics-l AT lists.bnl.gov>; sphenix-hf-Jets-l AT lists.bnl.gov <sphenix-hf-jets-l AT lists.bnl.gov>; Huang, Jin via sPHENIX-upsilons-l <Sphenix-upsilons-l AT lists.bnl.gov>
Subject: [Sphenix-hf-jets-l] Next HF&Q meeting, 01/31/24

 

Dear heavy flavor and quarkonia enthusiasts,

We will have our next joint open heavy flavor and quarkonia topical group meeting tomorrow, Wednesday January 31st 2024, at 13:30 ET. The agenda is:

(1) Introduction - conveners

(2) Proton tagging for Lambda_c decays - Charles Hughes, ISU

(3) Heavy flavor jet reconstruction in the new jet framework - Xuan Li and Jakub Kvapil, LANL

The indico agenda can be found at https://indico.bnl.gov/event/22136  and the zoom link is https://bnl.zoomgov.com/j/1613938007?pwd=QjYzUnpYQ2xNZWZLSy9qd3Z4dFpzZz09 

We look forward to talking to everyone tomorrow,

Jin, Marzia, Tony and Cameron