NS: POCA function in Helix does not work for negatively charged tracks.
JM: Added Jira item.
NG: Hmatrix upgrade. Hoping to get something from Karsten. Haven't gotten him to dial in. Will just patch it. Hope that transverse stuff would be added and make update all at once. Okay with doing incrementally. Should standardize on fixed-cone. Easy to find minimum that gives good Eres and separation. Could calculate from compact description from moliere radius. Could calculate opening angle based on the detector.
SM: Assuming hits behind main cluster won't adversly affect the hmatrix. Help by adding energy to the photon to improve the result. Might need to tune the cone to optimize it. Looks like if fit cone to the main cluster, then pickup a fraction of (???) to improve Eres.
NG: Has been some progress (claims) from Geant4 group that modifications to multiple scattering have been made for EM bug. In almost all of Tatsumi's plots, looking at scintillator/lead. In some sense, don't care, because want to make sure it works in very thin silicon.
SM: Geant4 team sees same problem?
NG: Not as pronounced, because ratio of absorber/sensitive thickness ~1, while our sensitive is much thinner.
Done any other photon analysis, e.g. efficiency as function of pT?
SM: Trying to tune-up the track-finding.