sPHENIX tracking discussion

["Osborn, Joseph" <josborn1 AT bnl.gov>]

Hi Derek,

 

Thanks for putting together this comprehensive set of slides. I have a few questions:

 

1. Regarding conclusion 4 on slide 2, on slides 15-16 you are specifically requiring that the reconstructed tracks have nmaps and nintt in your selection cut. If you remove these requirements, do the nlmaps and nlintt distributions look more similar to the gnlmaps and gnlintt distributions? They definitely won’t in some regards for the maps since our current silicon seeding algorithm requires 3 maps hits to find the seed (maybe there will be a more even number of 3 maps hits to 0 maps hits secondary tracks), but I’m wondering if the INTT distribution will look more similar. The poor vertex distribution for the secondaries is not surprising because we assume in the default tracking that all particles are primaries. Tony wrote a secondary vertex finder that finds where tracks intersect far from the beampipe and determines their track parameters at their actual point of origin.
2. Slide 19 I do not understand at all. Can you also plot the quality of these tracks as a function of eta? i.e. quality vs. eta for the up/center/down bands. This would imply the Kalman Filter is biased in some way for larger pseudorapidity tracks. Could you also plot eta-geta as a function of eta and phi-gphi as a function of eta to see if there is any clear bias in the other track parameters from the KF? It might also be instructive to plot deltaeta/eta and deltaphi/phi as a function of eta to see if the KF is biased in these parameters also.

 

Joe

 

___________________________

Joe Osborn, Ph.D

Physics Department

Brookhaven National Laboratory

josborn1 AT bnl.gov

 

 

From: sPHENIX-tracking-l <sphenix-tracking-l-bounces AT lists.bnl.gov> on behalf of Anderson, Derek [PHYSA] via sPHENIX-tracking-l <sphenix-tracking-l AT lists.bnl.gov>
Date: Wednesday, May 24, 2023 at 6:56 AM
To: sphenix-tracking-l AT lists.bnl.gov <sphenix-tracking-l AT lists.bnl.gov>, Anthony Frawley <afrawley AT fsu.edu>
Subject: Re: [Sphenix-tracking-l] Tracking software meeting Wednesday May 24 at 9:30 am EDT

Hi all,

 

I'm on the owl shift this week, so I won't be able to make it to the meeting, but I do have some slides following up on my presentation from a couple weeks ago (attached) that I'd like to circulate!

 

 -- Derek

---

From: sPHENIX-tracking-l <sphenix-tracking-l-bounces AT lists.bnl.gov> on behalf of Anthony Frawley via sPHENIX-tracking-l <sphenix-tracking-l AT lists.bnl.gov>
Sent: Tuesday, May 23, 2023 5:01 PM
To: sphenix-tracking-l AT lists.bnl.gov <sphenix-tracking-l AT lists.bnl.gov>
Subject: [Sphenix-tracking-l] Tracking software meeting Wednesday May 24 at 9:30 am EDT

 

Hi All,

 

We will have our usual tracking software meeting tomorrow, Wednesday May 24, at 9:30 am EDT.

 

The zoom link is:

https://fsu.zoom.us/j/91902088638

 

The indico page is:

https://indico.bnl.gov/event/19536/

 

Best regards

Tony