/usr/include/Pythia8/Pythia8/MergingHooks.h is in libpythia8-dev 8.1.80-1.
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// Copyright (C) 2013 Torbjorn Sjostrand.
// PYTHIA is licenced under the GNU GPL version 2, see COPYING for details.
// Please respect the MCnet Guidelines, see GUIDELINES for details.
// This file is written by Stefan Prestel.
// Header file to allow user access to program at different stages.
// HardProcess: Container class for the hard process to be merged. Holds the
// bookkeeping of particles not be be reclustered
// MergingHooks: Steering class for matrix element merging. Some functions can
// be redefined in a derived class to have access to the merging
#ifndef Pythia8_MergingHooks_H
#define Pythia8_MergingHooks_H
#include "Pythia8/Basics.h"
#include "Pythia8/BeamParticle.h"
#include "Pythia8/Event.h"
#include "Pythia8/Info.h"
#include "Pythia8/ParticleData.h"
#include "Pythia8/PartonSystems.h"
#include "Pythia8/PythiaStdlib.h"
#include "Pythia8/Settings.h"
namespace Pythia8 {
//==========================================================================
// Declaration of hard process class
// This class holds information on the desired hard 2->2 process
// for the merging.
// This class is a container class for History class use.
class HardProcess {
public:
// Flavour of the first incoming particle
int hardIncoming1;
// Flavour of the second incoming particle
int hardIncoming2;
// Flavours of the outgoing particles
vector<int> hardOutgoing1;
vector<int> hardOutgoing2;
// Flavour of intermediate bosons in the hard 2->2
vector<int> hardIntermediate;
// Current reference event
Event state;
// Potential positions of outgoing particles in reference event
vector<int> PosOutgoing1;
vector<int> PosOutgoing2;
// Potential positions of intermediate bosons in reference event
vector<int> PosIntermediate;
// Information on merging scale read from LHE file
double tms;
// Default constructor
HardProcess(){}
// Default destructor
~HardProcess(){}
// Copy constructor
HardProcess( const HardProcess& hardProcessIn )
: state(hardProcessIn.state),
tms(hardProcessIn.tms) {
hardIncoming1 = hardProcessIn.hardIncoming1;
hardIncoming2 = hardProcessIn.hardIncoming2;
for(int i =0; i < int(hardProcessIn.hardOutgoing1.size());++i)
hardOutgoing1.push_back( hardProcessIn.hardOutgoing1[i]);
for(int i =0; i < int(hardProcessIn.hardOutgoing2.size());++i)
hardOutgoing2.push_back( hardProcessIn.hardOutgoing2[i]);
for(int i =0; i < int(hardProcessIn.hardIntermediate.size());++i)
hardIntermediate.push_back( hardProcessIn.hardIntermediate[i]);
for(int i =0; i < int(hardProcessIn.PosOutgoing1.size());++i)
PosOutgoing1.push_back( hardProcessIn.PosOutgoing1[i]);
for(int i =0; i < int(hardProcessIn.PosOutgoing2.size());++i)
PosOutgoing2.push_back( hardProcessIn.PosOutgoing2[i]);
for(int i =0; i < int(hardProcessIn.PosIntermediate.size());++i)
PosIntermediate.push_back( hardProcessIn.PosIntermediate[i]);
}
// Constructor with path to LHE file
HardProcess( string LHEfile, ParticleData* particleData) {
state = Event();
state.init("(hard process)", particleData);
translateLHEFString(LHEfile);
}
// Constructor with core process input
void initOnProcess( string process, ParticleData* particleData);
// Constructor with path to LHE file input
void initOnLHEF( string LHEfile, ParticleData* particleData);
// Function to access the LHE file and read relevant information
void translateLHEFString( string LHEpath);
// Function to translate the process string (in MG/ME notation)
void translateProcessString( string process);
// Function to clear hard process information
void clear();
// Function to check whether the sets of candidates Pos1, Pos2, together
// with the proposed candidate iPos give an allowed hard process state
bool allowCandidates(int iPos, vector<int> Pos1, vector<int> Pos2,
const Event& event);
// Function to identify the hard subprocess in the current event
void storeCandidates( const Event& event, string process);
// Function to check if the particle event[iPos] matches any of
// the stored outgoing particles of the hard subprocess
bool matchesAnyOutgoing(int iPos, const Event& event);
// Function to check if instead of the particle event[iCandidate], another
// particle could serve as part of the hard process. Assumes that iCandidate
// is already stored as part of the hard process.
bool findOtherCandidates(int iPos, const Event& event, bool doReplace);
// Function to exchange a stored hard process candidate with another choice.
bool exchangeCandidates( vector<int> candidates1, vector<int> candidates2,
map<int,int> further1, map<int,int> further2);
// Function to get the number of coloured final state partons in the
// hard process
int nQuarksOut();
// Function to get the number of uncoloured final state particles in the
// hard process
int nLeptonOut();
// Function to get the number of electroweak final state bosons in the
// hard process
int nBosonsOut();
// Function to get the number of coloured initial state partons in the
// hard process
int nQuarksIn();
// Function to get the number of uncoloured initial state particles in the
// hard process
int nLeptonIn();
// Function to report if a resonace decay was found in the 2->2 sub-process
// of the current state
int hasResInCurrent();
// Function to report the number of resonace decays in the 2->2 sub-process
// of the current state
int nResInCurrent();
// Function to report if a resonace decay was found in the 2->2 hard process
bool hasResInProc();
// Function to print the hard process (for debug)
void list() const;
// Function to print the hard process candidates in the
// Matrix element state (for debug)
void listCandidates() const;
};
//==========================================================================
// MergingHooks is base class for user input to the merging procedure.
class MergingHooks {
public:
// Constructor.
MergingHooks() :
doUserMergingSave(false),
doMGMergingSave(false),
doKTMergingSave(false),
doPTLundMergingSave(false),
doCutBasedMergingSave(false),
doNL3TreeSave(false),
doNL3LoopSave(false),
doNL3SubtSave(false),
doUNLOPSTreeSave(false),
doUNLOPSLoopSave(false),
doUNLOPSSubtSave(false),
doUNLOPSSubtNLOSave(false),
doUMEPSTreeSave(false),
doUMEPSSubtSave(false),
doEstimateXSection(false),
doRemoveDecayProducts(false),
doOrderHistoriesSave(true),
doCutOnRecStateSave(false),
doWClusteringSave(false),
doSQCDClusteringSave(false),
doIgnoreEmissionsSave(true),
doIgnoreStepSave(true) {
inputEvent = Event(); resonances.resize(0); infoPtr = 0;
particleDataPtr = 0; partonSystemsPtr = 0;}
// Make History class friend to allow access to advanced switches
friend class History;
// Make Pythia class friend
friend class Pythia;
// Make PartonLevel class friend
friend class PartonLevel;
// Make SpaceShower class friend
friend class SpaceShower;
// Make TimeShower class friend
friend class TimeShower;
// Make Merging class friend
friend class Merging;
//----------------------------------------------------------------------//
// Functions that allow user interference
//----------------------------------------------------------------------//
// Destructor.
virtual ~MergingHooks(){}
// Function encoding the functional definition of the merging scale
virtual double tmsDefinition( const Event& event){ return event[0].e();}
// Function to dampen weights calculated from histories with lowest
// multiplicity reclustered events that do not pass the ME cuts
virtual double dampenIfFailCuts( const Event& inEvent ) {
// Dummy statement to avoid compiler warnings
if(false) cout << inEvent[0].e();
return 1.;
}
// Hooks to disallow states in the construction of all histories, e.g.
// because jets are below the merging scale or fail the matrix element cuts
// Function to allow interference in the construction of histories
virtual bool canCutOnRecState() { return doCutOnRecStateSave; }
// Function to check reclustered state while generating all possible
// histories
// Function implementing check of reclustered events while constructing
// all possible histories
virtual bool doCutOnRecState( const Event& event ) {
// Dummy statement to avoid compiler warnings.
if(false) cout << event[0].e();
// Count number of final state partons.
int nPartons = 0;
for( int i=0; i < int(event.size()); ++i)
if( event[i].isFinal()
&& (event[i].isGluon() || event[i].isQuark()) )
nPartons++;
// For gg -> h, allow only histories with gluons in initial state
if( hasEffectiveG2EW() && nPartons < 2){
if(event[3].id() != 21 && event[4].id() != 21)
return true;
}
return false;
}
// Function to allow not counting a trial emission.
virtual bool canVetoTrialEmission() { return false;}
// Function to check if trial emission should be rejected.
virtual bool doVetoTrialEmission( const Event&, const Event& ) {
return false; }
// Function to calculate the hard process matrix element.
virtual double hardProcessME( const Event& inEvent ) {
// Dummy statement to avoid compiler warnings.
if ( false ) cout << inEvent[0].e(); return 1.; }
//----------------------------------------------------------------------//
// Simple output functions
//----------------------------------------------------------------------//
// Function returning the value of the merging scale.
double tms() {
if(doCutBasedMergingSave) return 0.;
else return tmsValueSave;
}
// Function returning the value of the Delta R_{ij} cut for
// cut based merging scale definition.
double dRijMS() {
return ((tmsListSave.size() == 3) ? tmsListSave[0] : 0.);
}
// Function returning the value of the pT_{i} cut for
// cut based merging scale definition.
double pTiMS() {
return ((tmsListSave.size() == 3) ? tmsListSave[1] : 0.);
}
// Function returning the value of the pT_{i} cut for
// cut based merging scale definition.
double QijMS() {
return ((tmsListSave.size() == 3) ? tmsListSave[2] : 0.);
}
// Function returning the value of the maximal number of merged jets.
int nMaxJets() { return nJetMaxSave;}
// Function returning the value of the maximal number of merged jets,
// for which NLO corrections are available.
int nMaxJetsNLO() { return nJetMaxNLOSave;}
// Function to return hard process string.
string getProcessString() { return processSave;}
// Function to return the number of outgoing partons in the core process
int nHardOutPartons(){ return hardProcess.nQuarksOut();}
// Function to return the number of outgoing leptons in the core process
int nHardOutLeptons(){ return hardProcess.nLeptonOut();}
// Function to return the number of outgoing electroweak bosons in the core
// process.
int nHardOutBosons(){ return hardProcess.nBosonsOut();}
// Function to return the number of incoming partons (hadrons) in the core
// process.
int nHardInPartons(){ return hardProcess.nQuarksIn();}
// Function to return the number of incoming leptons in the core process.
int nHardInLeptons(){ return hardProcess.nLeptonIn();}
// Function to report the number of resonace decays in the 2->2 sub-process
// of the current state.
int nResInCurrent(){ return hardProcess.nResInCurrent();}
// Function to determine if user defined merging should be applied.
bool doUserMerging(){ return doUserMergingSave;}
// Function to determine if automated MG/ME merging should be applied.
bool doMGMerging() { return doMGMergingSave;}
// Function to determine if KT merging should be applied.
bool doKTMerging() { return doKTMergingSave;}
// Function to determine if PTLund merging should be applied.
bool doPTLundMerging() { return doPTLundMergingSave;}
// Function to determine if cut based merging should be applied.
bool doCutBasedMerging() { return doCutBasedMergingSave;}
bool doCKKWLMerging() { return (doUserMergingSave || doMGMergingSave
|| doKTMergingSave || doPTLundMergingSave || doCutBasedMergingSave); }
// Functions to determine if and which part of UMEPS merging
// should be applied
bool doUMEPSTree() { return doUMEPSTreeSave;}
bool doUMEPSSubt() { return doUMEPSSubtSave;}
bool doUMEPSMerging() { return (doUMEPSTreeSave || doUMEPSSubtSave);}
// Functions to determine if and which part of NL3 merging
// should be applied
bool doNL3Tree() { return doNL3TreeSave;}
bool doNL3Loop() { return doNL3LoopSave;}
bool doNL3Subt() { return doNL3SubtSave;}
bool doNL3Merging() { return (doNL3TreeSave || doNL3LoopSave
|| doNL3SubtSave); }
// Functions to determine if and which part of UNLOPS merging
// should be applied
bool doUNLOPSTree() { return doUNLOPSTreeSave;}
bool doUNLOPSLoop() { return doUNLOPSLoopSave;}
bool doUNLOPSSubt() { return doUNLOPSSubtSave;}
bool doUNLOPSSubtNLO() { return doUNLOPSSubtNLOSave;}
bool doUNLOPSMerging() { return (doUNLOPSTreeSave || doUNLOPSLoopSave
|| doUNLOPSSubtSave || doUNLOPSSubtNLOSave); }
// Return the number clustering steps that have actually been done.
int nRecluster() { return nReclusterSave;}
//----------------------------------------------------------------------//
// Output functions to analyse/prepare event for merging
//----------------------------------------------------------------------//
// Function to check if event contains an emission not present in the hard
// process.
bool isFirstEmission(const Event& event);
// Function to allow effective gg -> EW boson couplings.
bool hasEffectiveG2EW() {
if ( getProcessString().compare("pp>h") == 0 ) return true;
return false; }
// Return event stripped from decay products.
Event bareEvent( const Event& inputEventIn, bool storeInputEvent );
// Write event with decay products attached to argument.
bool reattachResonanceDecays( Event& process );
// Check if particle at position iPos is part of the hard sub-system
bool isInHard( int iPos, const Event& event);
// Function to return the number of clustering steps for the current event
int getNumberOfClusteringSteps(const Event& event);
//----------------------------------------------------------------------//
// Functions to steer contruction of histories
//----------------------------------------------------------------------//
// Function to force preferred picking of ordered histories. By default,
// unordered histories will only be considered if no ordered histories
// were found.
void orderHistories( bool doOrderHistoriesIn) {
doOrderHistoriesSave = doOrderHistoriesIn; }
// Function to force cut on reconstructed states internally, as needed
// for gg -> Higgs to ensure that e.g. uu~ -> Higgs is not constructed.
void allowCutOnRecState( bool doCutOnRecStateIn) {
doCutOnRecStateSave = doCutOnRecStateIn; }
// Function to allow final state clusterings of W-bosons
void doWClustering( bool doWClusteringIn ) {
doWClusteringSave = doWClusteringIn; }
//----------------------------------------------------------------------//
// Functions used as default merging scales
//----------------------------------------------------------------------//
// Function to check if the input particle is a light jet, i.e. should be
// checked against the merging scale defintion.
bool checkAgainstCut( const Particle& particle);
// Function to return the value of the merging scale function in the
// current event.
double tmsNow( const Event& event );
// Find the minimal Lund pT between coloured partons in the event
double rhoms( const Event& event, bool withColour);
// Function to calculate the minimal kT in the event
double kTms(const Event & event);
// Find the if the event passes the Delta R_{ij}, pT_{i} and Q_{ij} cuts on
// the matrix element, as needed for cut-based merging scale definition
double cutbasedms( const Event& event );
protected:
//----------------------------------------------------------------------//
// The members, switches etc.
//----------------------------------------------------------------------//
// Helper class doing all the core process book-keeping
HardProcess hardProcess;
// Pointer to various information on the generation.
Info* infoPtr;
// Pointer to the particle data table.
ParticleData* particleDataPtr;
// Pointer to the particle systems.
PartonSystems* partonSystemsPtr;
// AlphaS objects for alphaS reweighting use
AlphaStrong AlphaS_FSRSave;
AlphaStrong AlphaS_ISRSave;
AlphaEM AlphaEM_FSRSave;
// Saved path to LHE file for more automated merging
string lheInputFile;
// Flags for merging procedure definition.
bool doUserMergingSave, doMGMergingSave, doKTMergingSave,
doPTLundMergingSave, doCutBasedMergingSave,
includeMassiveSave, enforceStrongOrderingSave, orderInRapiditySave,
pickByFullPSave, pickByPoPT2Save, includeRedundantSave,
pickBySumPTSave, allowColourShufflingSave, resetHardQRenSave,
resetHardQFacSave;
int unorderedScalePrescipSave, unorderedASscalePrescipSave,
unorderedPDFscalePrescipSave, incompleteScalePrescipSave,
ktTypeSave, nReclusterSave, nQuarksMergeSave;
double scaleSeparationFactorSave, nonJoinedNormSave,
fsrInRecNormSave, herwigAcollFSRSave, herwigAcollISRSave,
pT0ISRSave, pTcutSave;
bool doNL3TreeSave, doNL3LoopSave, doNL3SubtSave;
bool doUNLOPSTreeSave, doUNLOPSLoopSave, doUNLOPSSubtSave,
doUNLOPSSubtNLOSave;
bool doUMEPSTreeSave, doUMEPSSubtSave;
// Flag to only do phase space cut, rejecting events below the tms cut.
bool doEstimateXSection;
// Save input event in case decay products need to be detached.
Event inputEvent;
vector< pair<int,int> > resonances;
bool doRemoveDecayProducts;
// Starting scale for attaching MPI.
double muMISave;
// Precalculated K-factors.
double kFactor0jSave;
double kFactor1jSave;
double kFactor2jSave;
// Saved members.
double tmsValueSave;
int nJetMaxSave;
int nJetMaxNLOSave;
string processSave;
// List of cut values to used to define a merging scale. Ordering:
// 0: DeltaR_{jet_i,jet_j,min}
// 1: p_{T,jet_i,min}
// 2: Q_{jet_i,jet_j,min}
vector<double> tmsListSave;
// INTERNAL Hooks to allow construction of all histories,
// including un-ordered ones
bool doOrderHistoriesSave;
// INTERNAL Hooks to disallow states in the construction of all histories,
// e.g. because jets are below the merging scale, of to avoid the
// construction of uu~ -> Higgs histories.
bool doCutOnRecStateSave;
// INTERNAL Hooks to allow clustering W bosons.
bool doWClusteringSave, doSQCDClusteringSave;
// Store / get first scale in PDF's that Pythia should have used
double muFSave;
double muRSave;
// Store / get factorisation scale used in matrix element calculation.
double muFinMESave;
double muRinMESave;
// Flag to indicate trial shower usage.
bool doIgnoreEmissionsSave;
// Flag to indicate if events should be vetoed.
bool doIgnoreStepSave;
// Stored weights in case veot needs to be revoked
double pTsave;
double weightCKKWL1Save, weightCKKWL2Save;
int nMinMPISave;
// Save CKKW-L weight / O(\alpha_s) weight.
double weightCKKWLSave, weightFIRSTSave;
//----------------------------------------------------------------------//
// Generic setup functions
//----------------------------------------------------------------------//
// Functions for internal use inside Pythia source code
// Initialize.
void init( Settings settings, Info* infoPtrIn,
ParticleData* particleDataPtrIn, PartonSystems* partonSystemsPtrIn,
ostream& os = cout);
// Function storing candidates for the hard process in the current event
// Needed in order not to cluster members of the core process
void storeHardProcessCandidates(const Event& event){
hardProcess.storeCandidates(event,getProcessString());
}
// Function to set the path to the LHE file, so that more automated merging
// can be used.
// Remove "_1.lhe" suffix from LHE file name.
// This is done so that the HarsProcess class can access both the +0 and +1
// LHE files to find both the merging scale and the core process string
// Store.
void setLHEInputFile( string lheFile) {
lheInputFile = lheFile.substr(0,lheFile.size()-6); }
//----------------------------------------------------------------------//
// Functions for output of class members.
//----------------------------------------------------------------------//
// Return AlphaStrong objects
AlphaStrong* AlphaS_FSR() { return &AlphaS_FSRSave;}
AlphaStrong* AlphaS_ISR() { return &AlphaS_ISRSave;}
AlphaEM* AlphaEM_FSR() { return &AlphaEM_FSRSave;}
// Functions to return advanced merging switches
// Include masses in definition of evolution pT and splitting kernels
bool includeMassive() { return includeMassiveSave;}
// Prefer strongly ordered histories
bool enforceStrongOrdering() { return enforceStrongOrderingSave;}
// Prefer histories ordered in rapidity and evolution pT
bool orderInRapidity() { return orderInRapiditySave;}
// Pick history probabilistically by full (correct) splitting probabilities
bool pickByFull() { return pickByFullPSave;}
// Pick history probabilistically, with easier form of probabilities
bool pickByPoPT2() { return pickByPoPT2Save;}
// Include redundant terms (e.g. PDF ratios) in the splitting probabilities
bool includeRedundant(){ return includeRedundantSave;}
// Pick by winner-takes-it-all, with minimum sum of scalar evolution pT
bool pickBySumPT(){ return pickBySumPTSave;}
// Prescription for combined scale of unordered emissions
// 0 : use larger scale
// 1 : use smaller scale
int unorderedScalePrescip() { return unorderedScalePrescipSave;}
// Prescription for combined scale used in alpha_s for unordered emissions
// 0 : use combined emission scale in alpha_s weight for both (!) splittings
// 1 : use original reclustered scales of each emission in alpha_s weight
int unorderedASscalePrescip() { return unorderedASscalePrescipSave;}
// Prescription for combined scale used in PDF ratios for unordered
// emissions
// 0 : use combined emission scale in PDFs for both (!) splittings
// 1 : use original reclustered scales of each emission in PDF ratiost
int unorderedPDFscalePrescip() { return unorderedPDFscalePrescipSave;}
// Prescription for starting scale of incomplete histories
// 0: use factorization scale
// 1: use sHat
// 2: use s
int incompleteScalePrescip() { return incompleteScalePrescipSave;}
// Allow swapping one colour index while reclustering
bool allowColourShuffling() { return allowColourShufflingSave;}
// Allow use of dynamical renormalisation scale of the core 2-> 2 process.
bool resetHardQRen() { return resetHardQRenSave; }
// Allow use of dynamical factorisation scale of the core 2-> 2 process.
bool resetHardQFac() { return resetHardQFacSave; }
// Factor by which two scales should differ to be classified strongly
// ordered.
double scaleSeparationFactor() { return scaleSeparationFactorSave;}
// Absolute normalization of splitting probability for non-joined
// evolution.
double nonJoinedNorm() { return nonJoinedNormSave;}
// Absolute normalization of splitting probability for final state
// splittings with initial state recoiler
double fsrInRecNorm() { return fsrInRecNormSave;}
// Factor multiplying scalar evolution pT for FSR splitting, when picking
// history by minimum scalar pT (see Jonathan Tully's thesis)
double herwigAcollFSR() { return herwigAcollFSRSave;}
// Factor multiplying scalar evolution pT for ISR splitting, when picking
// history by minimum scalar pT (see Jonathan Tully's thesis)
double herwigAcollISR() { return herwigAcollISRSave;}
// ISR regularisation scale
double pT0ISR() { return pT0ISRSave;}
// Shower cut-off scale
double pTcut() { return pTcutSave;}
// MI starting scale.
void muMI( double mu) { muMISave = mu; }
double muMI() { return muMISave;}
// Full k-Factor for current event
double kFactor(int njet = 0) {
return (njet == 0) ? kFactor0jSave
:(njet == 1) ? kFactor1jSave
: kFactor2jSave;
}
// O(\alhpa_s)-term of the k-Factor for current event
double k1Factor( int njet = 0) {
return (kFactor(njet) - 1)/infoPtr->alphaS();
}
// Function to return if construction of histories is biased towards ordered
// histories.
bool orderHistories() { return doOrderHistoriesSave;}
// INTERNAL Hooks to disallow states in the construction of all histories,
// e.g. because jets are below the merging scale, of to avoid the
// construction of uu~ -> Higgs histories.
bool allowCutOnRecState() { return doCutOnRecStateSave;}
// INTERNAL Hooks to allow clustering W bosons.
bool doWClustering() { return doWClusteringSave;}
// INTERNAL Hooks to allow clustering clustering of gluons to squarks.
bool doSQCDClustering() { return doSQCDClusteringSave;}
// Store / get first scale in PDF's that Pythia should have used
double muF() { return (muFSave > 0.) ? muFSave : infoPtr->QFac();}
double muR() { return (muRSave > 0.) ? muRSave : infoPtr->QRen();}
// Store / get factorisation scale used in matrix element calculation.
double muFinME() { return (muFinMESave > 0.) ? muFinMESave
: infoPtr->QFac();}
double muRinME() { return (muRinMESave > 0.) ? muRinMESave
: infoPtr->QRen();}
//----------------------------------------------------------------------//
// Functions to steer shower evolution
//----------------------------------------------------------------------//
// Flag to indicate trial shower usage.
void doIgnoreEmissions( bool doIgnoreIn ) {
doIgnoreEmissionsSave = doIgnoreIn;
}
// Function to allow not counting a trial emission.
bool canVetoEmission() { return !doIgnoreEmissionsSave; }
// Function to check if emission should be rejected.
bool doVetoEmission( const Event& );
// Flag to indicate if events should be vetoed.
void doIgnoreStep( bool doIgnoreIn ) { doIgnoreStepSave = doIgnoreIn; }
// Function to allow event veto.
bool canVetoStep() { return !doIgnoreStepSave; }
// Function to check event veto.
bool doVetoStep( const Event& process, const Event& event,
bool doResonance = false );
// Stored weights in case veot needs to be revoked
void storeWeights( double weight ){ weightCKKWL1Save = weightCKKWL2Save
= weight; }
// Set starting scales
bool setShowerStartingScales( bool isTrial, bool doMergeFirstEmm,
double& pTscaleIn, const Event& event,
double& pTmaxFSRIn, bool& limitPTmaxFSRin,
double& pTmaxISRIn, bool& limitPTmaxISRin,
double& pTmaxMPIIn, bool& limitPTmaxMPIin );
void nMinMPI( int nMinMPIIn ) { nMinMPISave = nMinMPIIn; }
int nMinMPI() { return nMinMPISave;}
//----------------------------------------------------------------------//
// Functions for internal merging scale definions
//----------------------------------------------------------------------//
// Function to calculate the kT separation between two particles
double kTdurham(const Particle& RadAfterBranch,
const Particle& EmtAfterBranch, int Type, double D );
// Function to compute "pythia pT separation" from Particle input
double rhoPythia(const Particle& RadAfterBranch,
const Particle& EmtAfterBranch, const Particle& RecAfterBranch,
int ShowerType);
// Function to find a colour (anticolour) index in the input event,
// used to find colour-connected recoilers
int findColour(int col, int iExclude1, int iExclude2,
const Event& event, int type, bool isHardIn);
// Function to compute Delta R separation from 4-vector input
double deltaRij(Vec4 jet1, Vec4 jet2);
//----------------------------------------------------------------------//
// Functions for weight management
//----------------------------------------------------------------------//
// Function to get the CKKW-L weight for the current event
double getWeightNLO() { return (weightCKKWLSave - weightFIRSTSave);}
// Return CKKW-L weight.
double getWeightCKKWL() { return weightCKKWLSave; }
// Return O(\alpha_s) weight.
double getWeightFIRST() { return weightFIRSTSave; }
// Set CKKW-L weight.
void setWeightCKKWL( double weightIn){
weightCKKWLSave = weightIn;
infoPtr->setWeightCKKWL(weightIn); }
// Set O(\alpha_s) weight.
void setWeightFIRST( double weightIn){
weightFIRSTSave = weightIn;
infoPtr->setWeightFIRST(weightIn); }
};
//==========================================================================
} // end namespace Pythia8
#endif // Pythia8_MergingHooks_H
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