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[codex] Use channel energy for hit smearing #127

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Merged
lobis merged 1 commit into from
May 26, 2026
Merged

[codex] Use channel energy for hit smearing #127

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22 changes: 17 additions & 5 deletions src/TRestDetectorHitsSmearingProcess.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -22,8 +22,9 @@

//////////////////////////////////////////////////////////////////////////
/// TRestDetectorHitsSmearingProcess will introduce a stochastic smearing on the
/// energy of the hits for each event. The total energy of each event will be
/// re-distributed following a gaussian shaped function.
/// energy of the hits for each event. The total energy of the selected channel
/// type in each event will be re-distributed following a gaussian shaped
/// function.
///
/// The energy resolution will follow a root square law with the energy
/// using the `energyReference` and the `resolutionReference` as a pivoting
Expand Down Expand Up @@ -122,10 +123,21 @@ TRestEvent* TRestDetectorHitsSmearingProcess::ProcessEvent(TRestEvent* inputEven
fInputEvent = (TRestDetectorHitsEvent*)inputEvent;
fOutputEvent->SetEventInfo(fInputEvent);

Double_t eDep = fInputEvent->GetTotalEnergy();
Double_t eRes = fResolutionAtERef * TMath::Sqrt(fEnergyRef / eDep) / 2.35 / 100.0;
Double_t eDep = 0.0;
for (int hit = 0; hit < static_cast<int>(fInputEvent->GetNumberOfHits()); hit++) {
const auto hitType = fInputEvent->GetType(hit);
if ((fChannelType == "veto" && hitType == REST_HitType::VETO) ||
(fChannelType == "tpc" && hitType != REST_HitType::VETO)) {
eDep += fInputEvent->GetEnergy(hit);
}
}

Double_t gain = 1.0;
if (eDep > 0) {
Double_t eRes = fResolutionAtERef * TMath::Sqrt(fEnergyRef / eDep) / 2.35 / 100.0;
gain = fRandom->Gaus(1.0, eRes);
}

Double_t gain = fRandom->Gaus(1.0, eRes);
for (int hit = 0; hit < static_cast<int>(fInputEvent->GetNumberOfHits()); hit++) {
const auto hitType = fInputEvent->GetType(hit);

Expand Down
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