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Biased tau decayer update #31353

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Sep 9, 2020
Merged

Biased tau decayer update #31353

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a59026e
Updates to biasedTauDecayer for Pythia8.30X
smrenna Sep 3, 2020
32258e2
updates from code-format
smrenna Sep 3, 2020
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5 changes: 1 addition & 4 deletions GeneratorInterface/Pythia8Interface/interface/BiasedTauDecayer.h
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Original file line number Diff line number Diff line change
Expand Up @@ -8,10 +8,7 @@
//
class BiasedTauDecayer : public Pythia8::DecayHandler {
public:
BiasedTauDecayer(const Pythia8::Info* infoPtr,
Pythia8::Settings* settingsPtr,
Pythia8::ParticleData* particleDataPtr,
Pythia8::Rndm* rndmPtr);
BiasedTauDecayer(Pythia8::Info* infoPtr, Pythia8::Settings* settingsPtr);

bool decay(std::vector<int>& idProd,
std::vector<double>& mProd,
Expand Down
14 changes: 8 additions & 6 deletions GeneratorInterface/Pythia8Interface/plugins/Pythia8Hadronizer.cc
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Expand Up @@ -424,9 +424,10 @@ bool Pythia8Hadronizer::initializeForInternalPartons() {

bool biasedTauDecayer = fMasterGen->settings.flag("BiasedTauDecayer:filter");
if (biasedTauDecayer) {
if (!fBiasedTauDecayer.get())
fBiasedTauDecayer.reset(new BiasedTauDecayer(
&(fMasterGen->info), &(fMasterGen->settings), &(fMasterGen->particleData), &(fMasterGen->rndm)));
if (!fBiasedTauDecayer.get()) {
Pythia8::Info localInfo = fMasterGen->info;
fBiasedTauDecayer.reset(new BiasedTauDecayer(&localInfo, &(fMasterGen->settings)));
}
std::vector<int> handledParticles;
handledParticles.push_back(15);
fMasterGen->setDecayPtr(fBiasedTauDecayer, handledParticles);
Expand Down Expand Up @@ -566,9 +567,10 @@ bool Pythia8Hadronizer::initializeForExternalPartons() {

bool biasedTauDecayer = fMasterGen->settings.flag("BiasedTauDecayer:filter");
if (biasedTauDecayer) {
if (!fBiasedTauDecayer.get())
fBiasedTauDecayer.reset(new BiasedTauDecayer(
&(fMasterGen->info), &(fMasterGen->settings), &(fMasterGen->particleData), &(fMasterGen->rndm)));
if (!fBiasedTauDecayer.get()) {
Pythia8::Info localInfo = fMasterGen->info;
fBiasedTauDecayer.reset(new BiasedTauDecayer(&localInfo, &(fMasterGen->settings)));
}
std::vector<int> handledParticles;
handledParticles.push_back(15);
fMasterGen->setDecayPtr(fBiasedTauDecayer, handledParticles);
Expand Down
6 changes: 2 additions & 4 deletions GeneratorInterface/Pythia8Interface/src/BiasedTauDecayer.cc
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Expand Up @@ -8,11 +8,9 @@ using namespace Pythia8;
// leptonic decays
//

BiasedTauDecayer::BiasedTauDecayer(const Info* infoPtr,
Settings* settingsPtr,
ParticleData* particleDataPtr,
Rndm* rndmPtr) {
BiasedTauDecayer::BiasedTauDecayer(Info* infoPtr, Settings* settingsPtr) {
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Hi @smrenna . I seems to overlook something. Where do we propagate Settings* settingsPtr to P8, or differently asked, what happens to this argument in BiasedTauDecayer ?

decayer = TauDecays();
decayer.initInfoPtr(*infoPtr);
decayer.init();
filter_ = settingsPtr->flag("BiasedTauDecayer:filter");
eDecays_ = settingsPtr->flag("BiasedTauDecayer:eDecays");
Expand Down
44 changes: 44 additions & 0 deletions GeneratorInterface/Pythia8Interface/test/biasedTauDecayer.py
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@@ -0,0 +1,44 @@
#example gen fragment that takes a gridapack which produces
#ttH events with inclusive top decays and undecayed higgs at lhe level
#and selects resonance decays such that events have at least four leptons (electrons, muons, taus)

import FWCore.ParameterSet.Config as cms

process = cms.Process("PROD")

process.load("Configuration.StandardSequences.SimulationRandomNumberGeneratorSeeds_cff")

# link to cards:
# https://github.com/cms-sw/genproductions/blob/0d4b4288fa053d9a8aef5c6e123b66bf94c3aee8/bin/Powheg/production/V2/13TeV/Higgs/ttH_inclusive_NNPDF30_13TeV_M125/ttH_inclusive_NNPDF30_13TeV_M125.input

process.source = cms.Source("LHESource",
fileNames = cms.untracked.vstring('file:powheg-Ztautau.lhe')
)

from Configuration.Generator.Pythia8CommonSettings_cfi import *
from Configuration.Generator.Pythia8CUEP8M1Settings_cfi import *
from Configuration.Generator.Pythia8PowhegEmissionVetoSettings_cfi import *

process.generator = cms.EDFilter("Pythia8HadronizerFilter",
maxEventsToPrint = cms.untracked.int32(20),
pythiaPylistVerbosity = cms.untracked.int32(1),
filterEfficiency = cms.untracked.double(1.0),
pythiaHepMCVerbosity = cms.untracked.bool(False),
comEnergy = cms.double(13000.),
PythiaParameters = cms.PSet(
pythia8CommonSettingsBlock,
pythia8CUEP8M1SettingsBlock,
processParameters = cms.vstring(
'BiasedTauDecayer:filter = on',
'PartonLevel:MPI = off'
),
parameterSets = cms.vstring('pythia8CommonSettings',
'pythia8CUEP8M1Settings',
'processParameters'
)
)
)

process.p = cms.Path(process.generator)


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