• Is bottom right MC truth in tracker 1?
• How did you extract the data. Should attach the script used to generate data and extract it - I need to be able to reproduce the bug if you want me to look at it.
• Are you saying there is an issue with the track reconstruction or the MC?

It's an issue with the MC. It becomes an issue with the reconstruction when we miss the position calculation by large values (more than a couple of mm), but happens < 1% of the time.

I'm extracting values by writing them to a txt file during run-time.

ES

What geometry? What input beam? I need to be able to reproduce the bug if you want me to look at it.

Default geometry and input beam - I mean the ones set in the trunk. I know the geometry is Stage6 but i never looked at the beam definitions...

In order to reproduce those results you can just pick the trunk version and spit out MC values of position and momentum from SciFiSD.

Are these electrons or muons? For example, decay electrons are allowed to travel backwards with high pz...

I forgot to output the particle ID... scrolling through the json output, I found pid 22 and 2112 (although these don't seem to be interacting with the tracker) and 11 (these definitely create space points with weird pz).

FYI, PID lookup table (from xboa.Common):

pdg_pid_to_name  = {0:'none', 11:'e-', 12:'electron neutrino', 13:'mu-', 14:'muon neutrino', 
22:'photon', 111:'pi0', 211:'pi+', 321:'K+', 2112:'neutron', 2212:'proton', 1000010020:'deuterium', 
1000010030:'tritium', 1000020030:'3He', 1000020040:'4He', 130:'K0L', 310:'K0S', 311:'K0', 3122:'lambda', 
-11:'e+', -12:'electron antineutrino', -13:'mu+', -14:'muon antineutrino', -211:'pi-', -321:'K-', 
-2112:'antineutron', -2212:'antiproton', -3122:'antilambda'}

22 is photon, 2112 is neutron. Neutrals don't tend to deposit energy like charged particles, they just make background noise (so important to simulate, but just a pain that mucks up reconstruction).

Can you remake the plots one for each PID? Especially muons and electrons are interesting.

Thanks for that table. The particle decoding makes sense, remembering the energy deposits and momentum I saw for pid's 11, 22 and 2112. That's both exciting and a relief. :) Will do the plots you asked, just need a little time.