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Fix MCKinematicsReader for QED events when using collisioncontext #14387

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Merged
sawenzel merged 1 commit into from
Jun 11, 2025
Merged

Fix MCKinematicsReader for QED events when using collisioncontext #14387

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13 changes: 13 additions & 0 deletions DataFormats/simulation/src/DigitizationContext.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -151,6 +151,19 @@ bool DigitizationContext::initSimKinematicsChains(std::vector<TChain*>& simkinem
// add signal files
simkinematicschains.back()->AddFile(o2::base::NameConf::getMCKinematicsFileName(mSimPrefixes[source].data()).c_str());
}

// we add QED, if used in the digitization context
if (mEventRecordsWithQED.size() > 0) {
if (mSimPrefixes.size() >= QEDSOURCEID) {
LOG(fatal) << "Too many signal chains; crashes with QED source ID";
}

// it might be better to use an unordered_map for the simchains but this requires interface changes
simkinematicschains.resize(QEDSOURCEID + 1, nullptr);
simkinematicschains[QEDSOURCEID] = new TChain("o2sim");
simkinematicschains[QEDSOURCEID]->AddFile(o2::base::DetectorNameConf::getMCKinematicsFileName(mQEDSimPrefix).c_str());
}

return true;
}

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