Weekly chat on High Level Reco for FCC

Thursday 27 Feb 2025, 15:30 → 16:30 Europe/Zurich

https://cern.zoom.us/j/67268767764?pwd=0azNj5k6xml2OuEWFvg9yBd4KnyiPN.1

[Andrea] I have implemented the track fitter with genfit, but the digitizer is not ready to be used with that framework: DC hit covariance matrix has all null elements (see [github issue](https://github.com/key4hep/k4RecTracker/issues/48)) and VTX hits don't have the plane description (origin, v and u). Moreover, I wonder where I can find the CLD track fitting files that I can use to validate the genfit fitter.
Regarding the track finder, the trained model is behaving differently with IDEA v2 and IDEA v3, so we need to figure out why and if it is necessary to train it again.

[Lena] Working on using the workflow (training and plotting) + conda env 

[Sara]
- fitting the primary vertex (PV) without beamspot (BS) constraint gives good d0 resolution wrt PV (fast and full sim in agreement)
- d0 wrt (0,0,0) has the same resolution in fast and full sim -> tracking seems to be comparible in that regard
- next steps: 
    - check how PV fit works in the code and if it is possible to include BS constraints that are sensible
    - once I have a constructive proposal I'll ping @Brieuc to create the data!

15:30 → 16:00 News and updates

Speakers: Andrea De Vita (Universita e INFN, Padova (IT)), Anna Zaborowska (CERN), Dolores Garcia (CERN), Giovanni Marchiori (APC, CNRS/IN2P3 and Université Paris Cité), Iza Veliscek, Lena Maria Herrmann, Sara Aumiller (Technische Universitat Munchen (DE))