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Ensure CRT T0 usage in calibration ntuples is direction aware #547

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Merged
kjplows merged 1 commit into from
Jul 30, 2025
Merged

Ensure CRT T0 usage in calibration ntuples is direction aware #547

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11 changes: 3 additions & 8 deletions sbncode/Calibration/TrackCaloSkimmer_module.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -1140,15 +1140,10 @@ void sbn::TrackCaloSkimmer::FillTrack(const recob::Track &track,
fTrack->start.x = track.Start().X();
fTrack->end.x = track.End().X();
} else if (t0Info.hasT0CRTTrack) {
int driftDir = geo->TPC(hits[0]->WireID()).DriftDir().X();
const double driftv(dprop.DriftVelocity(dprop.Efield(), dprop.Temperature()));
// Comment from Francesco: I am not sure of the below formula.
// SBND has two TPCs with a common cathode like ICARUS, the driftvelocity
// returns the absolute value, but the displacement (basically the + below)
// depends on the TPC, in one case is + and in the other is negative.
// In this way the displacement is always in the same direction, working for
// one TPC, but not for the other.
fTrack->start.x = track.Start().X() + driftv*t0Info.t0CRTTrack*1e-3;
fTrack->end.x = track.End().X() + driftv*t0Info.t0CRTTrack*1e-3;
fTrack->start.x = track.Start().X() + driftDir*driftv*t0Info.t0CRTTrack*1e-3;
fTrack->end.x = track.End().X() + driftDir*driftv*t0Info.t0CRTTrack*1e-3;
} else if (t0Info.hasT0CRTHit){
// If the track does not have a a Pandora T0, the tracks will always be either on the left or (ex Or) right of the cathode.
int driftDir = geo->TPC(hits[0]->WireID()).DriftDir().X();
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