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Fix HepMC3 conversion on MC without event weights (particle guns) #45367

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Merged
cmsbuild merged 1 commit into from
Jul 4, 2024
Merged

Fix HepMC3 conversion on MC without event weights (particle guns) #45367

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10 changes: 8 additions & 2 deletions GeneratorInterface/RivetInterface/plugins/GenParticles2HepMCConverter.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -98,10 +98,16 @@ void GenParticles2HepMCConverter::produce(edm::Event& event, const edm::EventSet
hepmc_event->add_attribute("alphaQED", std::make_shared<HepMC3::DoubleAttribute>(genEventInfoHandle->alphaQED()));

hepmc_event->weights() = genEventInfoHandle->weights();
// add dummy weight if necessary
if (hepmc_event->weights().size() == 0) {
hepmc_event->weights().push_back(1.);
}

// resize cross section to number of weights
xsec_->set_cross_section(std::vector<double>(hepmc_event->weights().size(), xsec_->xsec(0)),
std::vector<double>(hepmc_event->weights().size(), xsec_->xsec_err(0)));
if (xsec_->xsecs().size() < hepmc_event->weights().size()) {
xsec_->set_cross_section(std::vector<double>(hepmc_event->weights().size(), xsec_->xsec(0)),
std::vector<double>(hepmc_event->weights().size(), xsec_->xsec_err(0)));
}
hepmc_event->set_cross_section(xsec_);

// Set PDF
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1 change: 1 addition & 0 deletions GeneratorInterface/RivetInterface/test/BuildFile.xml
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Expand Up @@ -12,4 +12,5 @@
<test name="test-particleLevel_fromHepMC3" command="cmsRun ${LOCALTOP}/src/GeneratorInterface/RivetInterface/test/particleLevel_fromHepMC3_cfg.py"/>
<test name="test-particleLevel_fromGenParticles" command="cmsRun ${LOCALTOP}/src/GeneratorInterface/RivetInterface/test/particleLevel_fromGenParticles_cfg.py"/>
<test name="test-particleLevel_fromMiniAod" command="cmsRun ${LOCALTOP}/src/GeneratorInterface/RivetInterface/test/particleLevel_cfg.py"/>
<test name="test-particleLevel_fromPtGun" command="cmsRun ${LOCALTOP}/src/GeneratorInterface/RivetInterface/test/particleLevel_fromPtGun_cfg.py"/>
<test name="test-HTXS" command="cmsRun ${LOCALTOP}/src/GeneratorInterface/RivetInterface/test/runRivetHTXS_cfg.py"/>
61 changes: 61 additions & 0 deletions GeneratorInterface/RivetInterface/test/particleLevel_fromPtGun_cfg.py
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@@ -0,0 +1,61 @@
import FWCore.ParameterSet.Config as cms

process = cms.Process("TQAF")

process.load("FWCore.MessageLogger.MessageLogger_cfi")
process.load("Configuration.StandardSequences.SimulationRandomNumberGeneratorSeeds_cff")

process.source = cms.Source("EmptySource")

process.generator = cms.EDFilter("Pythia8PtGun",
PGunParameters = cms.PSet(
AddAntiParticle = cms.bool(True),
MaxEta = cms.double(2.5),
MaxPhi = cms.double(3.14159265359),
MaxPt = cms.double(10.01),
MinEta = cms.double(-2.5),
MinPhi = cms.double(-3.14159265359),
MinPt = cms.double(9.99),
ParticleID = cms.vint32(11)
),
PythiaParameters = cms.PSet(
parameterSets = cms.vstring()
),
Verbosity = cms.untracked.int32(0),
firstRun = cms.untracked.uint32(1),
psethack = cms.string('single electron pt 10')
)

process.genParticles = cms.EDProducer("GenParticleProducer",
abortOnUnknownPDGCode = cms.untracked.bool(False),
saveBarCodes = cms.untracked.bool(True),
src = cms.InputTag("generator:unsmeared")
)


## define maximal number of events to loop over
process.maxEvents = cms.untracked.PSet(
input = cms.untracked.int32(100)
)
## configure process options
process.options = cms.untracked.PSet(
allowUnscheduled = cms.untracked.bool(True),
wantSummary = cms.untracked.bool(True)
)

process.load('SimGeneral.HepPDTESSource.pythiapdt_cfi')
process.load("GeneratorInterface.RivetInterface.genParticles2HepMC_cfi")
process.load("GeneratorInterface.RivetInterface.particleLevel_cfi")
process.particleLevel.src = cms.InputTag("genParticles2HepMC:unsmeared")

process.path = cms.Path(process.generator*process.genParticles*process.genParticles2HepMC*process.particleLevel)

process.out = cms.OutputModule("PoolOutputModule",
fileName = cms.untracked.string("particleLevel.root"),
outputCommands = cms.untracked.vstring(
"drop *",
"keep *_genParticles_*_*",
"keep *_particleLevel_*_*",
),
)
process.outPath = cms.EndPath(process.out)