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feat: adding cut on bar time sum for events for which the start time … #1005

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feat: adding cut on bar time sum for events for which the start time … #1005

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4 changes: 4 additions & 0 deletions reconstruction/alert/src/main/java/org/jlab/rec/atof/hit/ATOFHit.java
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Original file line number Diff line number Diff line change
Expand Up @@ -79,6 +79,10 @@ public void setTot(int tot) {
public double getTime() {
return time;
}

public double getStartTime() {
return this.startTime;
}

public void setTime(double time) {
this.time = time;
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17 changes: 12 additions & 5 deletions reconstruction/alert/src/main/java/org/jlab/rec/atof/hit/HitFinder.java
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,7 @@
import org.jlab.geom.base.Detector;
import org.jlab.io.base.DataBank;
import org.jlab.io.base.DataEvent;
import org.jlab.rec.alert.constants.CalibrationConstantsLoader;

/**
* The {@code HitFinder} class finds hits in the atof.
Expand Down Expand Up @@ -124,12 +125,18 @@ public void findHits(DataEvent event, Detector atof, float startTime) {
//Matching the hits: if same module and different order, they make up a bar hit
if (this_hit_up.matchBar(this_hit_down)) {
//Bar hits are matched to ahdc tracks and listed
if (countMatches > 0) {
//If the up hit was already involved in a match, do not make an additionnal match
//Chosing to ignore double matches for now because it happened for <1% of events in cosmic runs
continue;
}
BarHit this_bar_hit = new BarHit(this_hit_down, this_hit_up);
int key = this_hit_up.getSector()*10000 + this_hit_up.getLayer()*1000 + this_hit_up.getComponent()*10;//Order does not matter (t0 computed from time sum)
double[] timeOffsets = CalibrationConstantsLoader.ATOF_TIME_OFFSETS.get(key);
double meanTime = timeOffsets[0];
double sigmaTime = Math.abs(timeOffsets[3]);
//Cuts for bar time sum are derived correcting with FD electrons
//So we need to move the cut to be centered at the same startTime for FT electron events
//For now, we will just keep all FT electron events even if out of time
if(this_hit_up.getStartTime()!=-1000 && this_hit_up.getStartTime()!=0){
if(2*this_bar_hit.getTime() > meanTime + 5*sigmaTime) continue;
if(2*this_bar_hit.getTime() < meanTime - 3*sigmaTime) continue;
}
this.barHits.add(this_bar_hit);
countMatches++;
}
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