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New LCIO class or extended collection class that maintains the pointer list.
TrackerHit and RawTrackerHit do not have MCParticle info.
RP: RawTrackerHit documented?
TJ: Should make proposed diagram of tracker hit classing. And maybe propose the change to LCIO.
NS: Trying to debug SLD-based track fitter. Still do not have any other track finders.
Added additional constructor to fitter which builds track parameters. Uses the B-field.
Need to define/redefine track parameters.
Helix swimmer assumes positive tracks are curving clockwise.
Using D0 signed impact parameter.
If reference point inside the helix, impact parameter is positive. If outside, it is negative.
Will depend on the direction of the B-field if swimmer will use center-finding algorithm.
Should not do assumption about B-field direction when defining the helix.
Give momentum and angles and it defines helix. Also, another option with track parameters and will define helix.
TJ: Any reason not to do this?
NS: When construct, use negative omega.
TJ: When transform from track parameters to helix parameters, there is some assumption made about how to do it.
NG: In this case, probably okay, because +z = positive B-field.
MR: Able to reconstruct W's with Eres = 30% / sqrt(E) using cheater with nuclear interactions turned-off.
(Hadronic interactions in the tracking region.) With nuclear interactions, degrades to 45%. Study various effects.
NS: Track finder reconstructs a lot of gammas and neutrons.
MR: Switch in tracking cheater where can track back to FS particle or just use the charged. Conversion pair given back as track info for photon that has been converted. Keep track of all this in recon cheater. Don't have intension of undoing photon conversions or pi0 decays. The programs are working/functional. Some analysis of nuclear interactions: number of neg/pos/neutral particles per event. 2D scatter plots don't look as bad as 45%, but definite degradation with nuclear interactions included.
NG: Steve doing "perfect pflow" for several years. Should work with me.
SM: We should correspond about it.
MR: Eflow is cheated.
NG: Steve has numbers for contributions from neutrals, charged, etc.
MR: How well reconstruct inside detector as opposed to calorimeter only?
Protons and neutrons, silicon ions from interactions in tracking region.
Various ways of handling nuclear interactions. Can try to reconstruct charged particles and throw out, but can't subtract the neutrals. Need to try and reconstruct the shower.