Felix: worked on porting the ITS2 staggering readout tracking to the GPU code (not done yet, there is some crash I have to understand but CPU works:

Gabriele:

• Talked with Max Puccio
• Restricting computation of Vertex function to V(0,0,z) might be problematic due to possible shift of the beam line
• Currently implemented 3d version
  • For each voxel centre computes the vertex function
  • Then peak finder is run to find peaks and get vertex candidates
  • Currently tuning parameters with optuna
  • Precision: 1.0000, Recall: 0.7133, let's see where the plateau is
• 3d version too expensive anyway (16s seconds per PbPb TF)
• If tuning gives good results, I will try to find a way to preselect tracks per voxel to restrict computations
• Will try another implementation with 3d histogramming
  • Basically where the track contributes only for bins where it passes through