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Retrieve t0 errors from LC relations #1138

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Aug 18, 2025
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Retrieve t0 errors from LC relations #1138

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26 changes: 16 additions & 10 deletions tracking/src/main/java/org/hps/recon/tracking/kalman/KalmanInterface.java
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Original file line number Diff line number Diff line change
Expand Up @@ -1039,6 +1039,15 @@ private boolean fillAllMeasurements(EventHeader event) {
// Get the collection of 1D hits
String stripHitInputCollectionName = "StripClusterer_SiTrackerHitStrip1D";
List<TrackerHit> striphits = event.get(TrackerHit.class, stripHitInputCollectionName);

// LCRelations
String fittedHitsCollectionName = "SVTFittedRawTrackerHits";
List<LCRelation> _fittedHits = event.get(LCRelation.class, fittedHitsCollectionName);

Map<RawTrackerHit, LCRelation> fittedRawTrackerHitMap = new HashMap<RawTrackerHit, LCRelation>();
for (LCRelation fittedHit : _fittedHits) {
fittedRawTrackerHitMap.put(FittedRawTrackerHit.getRawTrackerHit(fittedHit), fittedHit);
}

if (striphits.size() > maxHits) maxHits = striphits.size();
if (striphits.size() > 200) nBigEvents++;
Expand Down Expand Up @@ -1175,18 +1184,15 @@ private boolean fillAllMeasurements(EventHeader event) {
fitter.setRunNum(event.getRunNumber());
double Variance=0.0;
for(RawTrackerHit rth: rawhits){
double Min = 10000;
for(ShapeFitParameters fit : fitter.fitShape(rth, shape)){
if(fit.getT0Err()<Min){
Min=fit.getT0Err();
}
}
if(module.Layer>1){
Variance+=1/(Min*Min);
}
double t0err = FittedRawTrackerHit.getT0Err(fittedRawTrackerHitMap.get(rth));
Variance+=1.0/(t0err*t0err);
// Why were we ignoring Layer 0...?
// if(module.Layer>1){
// Variance+=1/(Min*Min);
// }
}
Variance=1.0/Variance;
Measurement m = new Measurement(umeas, xStrip, du, time, localHit.getdEdx()*1000000.,Variance);
Measurement m = new Measurement(umeas, xStrip, du, time, localHit.getdEdx()*1000000.0,Variance);
module.addMeasurement(m);
hitMap.put(m, hit);
hitsFilled++;
Expand Down
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