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 // DireSplittingsU1new.h is a part of the PYTHIA event generator.
 // Copyright (C) 2025 Stefan Prestel, Torbjorn Sjostrand.
 // PYTHIA is licenced under the GNU GPL v2 or later, see COPYING for details.
 // Please respect the MCnet Guidelines, see GUIDELINES for details.
 
 // Header file for parton showers with a new U(1) force, e.g. dark photons.
 
 #ifndef Pythia8_DireSplittingsU1new_H
 #define Pythia8_DireSplittingsU1new_H
 
 #define DIRE_SPLITTINGSU1NEW_VERSION "2.002"
 
 #include "Pythia8/Basics.h"
 #include "Pythia8/BeamParticle.h"
 #include "Pythia8/ParticleData.h"
 #include "Pythia8/PythiaStdlib.h"
 #include "Pythia8/Settings.h"
 #include "Pythia8/StandardModel.h"
 
 #include "Pythia8/DireSplittingsQCD.h"
 
 namespace Pythia8 {
 
 //==========================================================================
 
 class DireSplittingU1new : public DireSplittingQCD {
 
 public:
 
   // Constructor and destructor.
   DireSplittingU1new(string idIn, int softRS, Settings* settings,
     ParticleData* particleData, Rndm* rndm, BeamParticle* beamA,
     BeamParticle* beamB, CoupSM* coupSM, Info* info, DireInfo* direInfo)
     : DireSplittingQCD(idIn, softRS, settings, particleData, rndm, beamA,
       beamB, coupSM, info, direInfo) { init(); }
   virtual ~DireSplittingU1new() {}
 
   void init();
 
   // VARIABLES
   double sumCharge2Tot, sumCharge2L, sumCharge2Q, ax0, enhance;
   bool doU1NEWshowerByQ, doU1NEWshowerByL;
 
   AlphaEM     alphaEM;
 
   // Function to calculate the correct running coupling/2*Pi value, including
   // renormalisation scale variations + threshold matching.
   double aem2Pi ( double pT2, int = 0);
 
   bool useFastFunctions() { return true; }
 
   virtual vector <int> radAndEmt(int idDaughter, int)
    { return createvector<int>(motherID(idDaughter))(sisterID(idDaughter)); }
   virtual int nEmissions()  { return 1; }
   virtual bool isPartial()  { return true; }
 
   virtual bool canUseForBranching() { return true; }
 
   virtual int couplingType (int, int) { return 2; }
   virtual double coupling (double = 0., double = 0., double = 0., double = -1.,
     pair<int,bool> = pair<int,bool>(), pair<int,bool> = pair<int,bool>()) {
     return (ax0 / (2.*M_PI));
   }
   virtual double couplingScale2 (double = 0., double = 0., double = 0.,
     pair<int,bool> = pair<int,bool>(), pair<int,bool> = pair<int,bool>()) {
     return -1.;
   }
 
 
 };
 
 //==========================================================================
 
 class Dire_fsr_u1new_Q2QA : public DireSplittingU1new {
 
 public:
 
   Dire_fsr_u1new_Q2QA(string idIn, int softRS, Settings* settings,
     ParticleData* particleData, Rndm* rndm, BeamParticle* beamA,
     BeamParticle* beamB, CoupSM* coupSM, Info* info, DireInfo* direInfo) :
     DireSplittingU1new(idIn, softRS, settings, particleData, rndm, beamA,
       beamB, coupSM, info, direInfo){}
 
   bool canRadiate ( const Event&, pair<int,int>,
     unordered_map<string,bool> = unordered_map<string,bool>(),
     Settings* = nullptr, PartonSystems* = nullptr, BeamParticle* = nullptr);
   bool canRadiate ( const Event&, int iRadBef, int iRecBef,
     Settings* = nullptr, PartonSystems* = nullptr, BeamParticle* = nullptr);
 
   int kinMap ();
 
   // Return id of mother after splitting.
   int motherID(int idDaughter);
 
   // Return id of emission.
   int sisterID(int idDaughter);
 
   // Return id of recombined radiator (before splitting!)
   int radBefID(int idRadAfter, int idEmtAfter);
 
   // Return colours of recombined radiator (before splitting!)
   pair<int,int> radBefCols(int colRadAfter, int acolRadAfter,
     int colEmtAfter, int acolEmtAfter);
 
   double gaugeFactor ( int=0, int=0 );
   double symmetryFactor ( int=0, int=0 );
 
   vector <int> recPositions( const Event& state, int iRad, int iEmt);
 
   // Pick z for new splitting.
   double zSplit(double zMinAbs, double zMaxAbs, double m2dip);
 
   // New overestimates, z-integrated versions.
   double overestimateInt(double zMinAbs,double zMaxAbs,
     double pT2Old, double m2dip, int order = -1);
 
   // Return kernel for new splitting.
   double overestimateDiff(double z, double m2dip, int order = -1);
 
   // Functions to calculate the kernel from SplitInfo information.
   bool calc(const Event& state = Event(), int order = -1);
 
 };
 
 //==========================================================================
 
 class Dire_fsr_u1new_Q2AQ : public DireSplittingU1new {
 
 public:
 
   Dire_fsr_u1new_Q2AQ(string idIn, int softRS, Settings* settings,
     ParticleData* particleData, Rndm* rndm, BeamParticle* beamA,
     BeamParticle* beamB, CoupSM* coupSM, Info* info, DireInfo* direInfo) :
     DireSplittingU1new(idIn, softRS, settings, particleData, rndm, beamA,
       beamB, coupSM, info, direInfo){}
 
   bool canRadiate ( const Event&, pair<int,int>,
     unordered_map<string,bool> = unordered_map<string,bool>(),
     Settings* = nullptr, PartonSystems* = nullptr, BeamParticle* = nullptr);
   bool canRadiate ( const Event&, int iRadBef, int iRecBef,
     Settings* = nullptr, PartonSystems* = nullptr, BeamParticle* = nullptr);
 
   int kinMap ();
 
   // Return id of mother after splitting.
   int motherID(int idDaughter);
 
   // Return id of emission.
   int sisterID(int idDaughter);
 
   // Return id of recombined radiator (before splitting!)
   int radBefID(int idRadAfter, int idEmtAfter);
 
   // Return colours of recombined radiator (before splitting!)
   pair<int,int> radBefCols(int colRadAfter, int acolRadAfter,
     int colEmtAfter, int acolEmtAfter);
 
   double gaugeFactor ( int=0, int=0 );
   double symmetryFactor ( int=0, int=0 );
 
   vector <int> recPositions( const Event& state, int iRad, int iEmt);
 
   // Pick z for new splitting.
   double zSplit(double zMinAbs, double zMaxAbs, double m2dip);
 
   // New overestimates, z-integrated versions.
   double overestimateInt(double zMinAbs,double zMaxAbs,
     double pT2Old, double m2dip, int order = -1);
 
   // Return kernel for new splitting.
   double overestimateDiff(double z, double m2dip, int order = -1);
 
   // Functions to calculate the kernel from SplitInfo information.
   bool calc(const Event& state = Event(), int order = -1);
 
 };
 
 //==========================================================================
 
 class Dire_fsr_u1new_L2LA : public DireSplittingU1new {
 
 public:
 
   Dire_fsr_u1new_L2LA(string idIn, int softRS, Settings* settings,
     ParticleData* particleData, Rndm* rndm, BeamParticle* beamA,
     BeamParticle* beamB, CoupSM* coupSM, Info* info, DireInfo* direInfo) :
     DireSplittingU1new(idIn, softRS, settings, particleData, rndm, beamA,
       beamB, coupSM, info, direInfo){}
 
   bool canRadiate ( const Event&, pair<int,int>,
     unordered_map<string,bool> = unordered_map<string,bool>(),
     Settings* = nullptr, PartonSystems* = nullptr, BeamParticle* = nullptr);
   bool canRadiate ( const Event&, int iRadBef, int iRecBef,
     Settings* = nullptr, PartonSystems* = nullptr, BeamParticle* = nullptr);
 
   int kinMap ();
 
   vector<pair<int,int> > radAndEmtCols(int iRad, int, Event state) {
     vector< pair<int,int> > ret
      = createvector<pair<int,int> >(make_pair(0, 0))(make_pair(0, 0));
     if (particleDataPtr->colType(state[iRad].id()) != 0) {
       ret[0].first  = state[iRad].col();
       ret[0].second = state[iRad].acol();
       ret[1].first  = 0;
       ret[1].second = 0;
     }
     return ret;
   }
 
   // Return id of mother after splitting.
   int motherID(int idDaughter);
 
   // Return id of emission.
   int sisterID(int idDaughter);
 
   // Return id of recombined radiator (before splitting!)
   int radBefID(int idRadAfter, int idEmtAfter);
 
   // Return colours of recombined radiator (before splitting!)
   pair<int,int> radBefCols(int colRadAfter, int acolRadAfter,
     int colEmtAfter, int acolEmtAfter);
 
   double gaugeFactor ( int=0, int=0 );
   double symmetryFactor ( int=0, int=0 );
 
   vector <int> recPositions( const Event& state, int iRad, int iEmt);
 
   // Pick z for new splitting.
   double zSplit(double zMinAbs, double zMaxAbs, double m2dip);
 
   // New overestimates, z-integrated versions.
   double overestimateInt(double zMinAbs,double zMaxAbs,
     double pT2Old, double m2dip, int order = -1);
 
   // Return kernel for new splitting.
   double overestimateDiff(double z, double m2dip, int order = -1);
 
   // Functions to calculate the kernel from SplitInfo information.
   bool calc(const Event& state = Event(), int order = -1);
 
 };
 
 //==========================================================================
 
 class Dire_fsr_u1new_L2AL : public DireSplittingU1new {
 
 public:
 
   Dire_fsr_u1new_L2AL(string idIn, int softRS, Settings* settings,
     ParticleData* particleData, Rndm* rndm, BeamParticle* beamA,
     BeamParticle* beamB, CoupSM* coupSM, Info* info, DireInfo* direInfo) :
     DireSplittingU1new(idIn, softRS, settings, particleData, rndm, beamA,
       beamB, coupSM, info, direInfo){}
 
   bool canRadiate ( const Event&, pair<int,int>,
     unordered_map<string,bool> = unordered_map<string,bool>(),
     Settings* = nullptr, PartonSystems* = nullptr, BeamParticle* = nullptr);
   bool canRadiate ( const Event&, int iRadBef, int iRecBef,
     Settings* = nullptr, PartonSystems* = nullptr, BeamParticle* = nullptr);
 
   int kinMap ();
 
   vector<pair<int,int> > radAndEmtCols(int iRad, int, Event state) {
     vector< pair<int,int> > ret
      = createvector<pair<int,int> >(make_pair(0, 0))(make_pair(0, 0));
     if (particleDataPtr->colType(state[iRad].id()) != 0) {
       ret[0].first  = state[iRad].col();
       ret[0].second = state[iRad].acol();
       ret[1].first  = 0;
       ret[1].second = 0;
     }
     return ret;
   }
 
   // Return id of mother after splitting.
   int motherID(int idDaughter);
 
   // Return id of emission.
   int sisterID(int idDaughter);
 
   // Return id of recombined radiator (before splitting!)
   int radBefID(int idRadAfter, int idEmtAfter);
 
   // Return colours of recombined radiator (before splitting!)
   pair<int,int> radBefCols(int colRadAfter, int acolRadAfter,
     int colEmtAfter, int acolEmtAfter);
 
   double gaugeFactor ( int=0, int=0 );
   double symmetryFactor ( int=0, int=0 );
 
   vector <int> recPositions( const Event& state, int iRad, int iEmt);
 
   // Pick z for new splitting.
   double zSplit(double zMinAbs, double zMaxAbs, double m2dip);
 
   // New overestimates, z-integrated versions.
   double overestimateInt(double zMinAbs,double zMaxAbs,
     double pT2Old, double m2dip, int order = -1);
 
   // Return kernel for new splitting.
   double overestimateDiff(double z, double m2dip, int order = -1);
 
   // Functions to calculate the kernel from SplitInfo information.
   bool calc(const Event& state = Event(), int order = -1);
 
 };
 
 //==========================================================================
 
 class Dire_fsr_u1new_A2FF : public DireSplittingU1new {
 
 public:
 
   int idRadAfterSave;
   double nchSaved;
 
   Dire_fsr_u1new_A2FF(int idRadAfterIn, string idIn, int softRS,
                       Settings* settings,
     ParticleData* particleData, Rndm* rndm, BeamParticle* beamA,
     BeamParticle* beamB, CoupSM* coupSM, Info* info, DireInfo* direInfo) :
     DireSplittingU1new(idIn,
     softRS, settings, particleData, rndm, beamA, beamB, coupSM, info,
                        direInfo),
     idRadAfterSave(idRadAfterIn), nchSaved(1) {}
   bool canRadiate ( const Event& state, pair<int,int> ints,
     unordered_map<string,bool> = unordered_map<string,bool>(),
     Settings* = nullptr, PartonSystems* = nullptr, BeamParticle* = nullptr) {
     return ( state[ints.first].isFinal()
           && state[ints.first].id() == 900032
           && (state[ints.second].isLepton()
            || state[ints.second].idAbs() == 900012));
   }
   bool canRadiate ( const Event& state, int iRadBef, int iRecBef,
     Settings* = nullptr, PartonSystems* = nullptr, BeamParticle* = nullptr) {
     return ( state[iRadBef].isFinal()
           && state[iRadBef].id() == 900032
           && (state[iRecBef].isLepton()
            || state[iRecBef].idAbs() == 900012));
   }
 
   int kinMap () { return 1;};
   bool isPartial()  { return false; }
 
   vector<pair<int,int> > radAndEmtCols(int iRad, int, Event state) {
     vector< pair<int,int> > ret;
     if (state[iRad].id() != 900032) return ret;
     ret = createvector<pair<int,int> >(make_pair(0, 0))(make_pair(0, 0));
     if (particleDataPtr->colType(idRadAfterSave) != 0) {
       int sign      = (idRadAfterSave > 0) ? 1 : -1;
       int newCol    = state.nextColTag();
       if (sign> 0) {
         ret[0].first  = newCol;
         ret[0].second = 0;
         ret[1].first  = 0;
         ret[1].second = newCol;
       } else {
         ret[0].first  = 0;
         ret[0].second = newCol;
         ret[1].first  = newCol;
         ret[1].second = 0;
       }
 
     }
     return ret;
   }
 
   // Return id of mother after splitting.
   int motherID(int)
     { return idRadAfterSave; }
   int sisterID(int)
     { return -idRadAfterSave; }
   vector <int> radAndEmt(int, int)
     { return createvector<int>(idRadAfterSave)(-idRadAfterSave); }
     //{ return createvector<int>(1)(-1); }
   double gaugeFactor    ( int=0, int=0 )
     { return 1.; }
   double symmetryFactor ( int=0, int=0 )
     { return 1./double(nchSaved); }
   // Return id of recombined radiator (before splitting!)
   int radBefID(int idRadAfter, int idEmtAfter) {
     if ( idRadAfter == idRadAfterSave
       && particleDataPtr->isQuark(idRadAfter)
       && particleDataPtr->isQuark(idEmtAfter)) return 900032;
     return 0;
   }
   // Return colours of recombined radiator (before splitting!)
   pair<int,int> radBefCols(int, int, int, int) { return make_pair(0,0); }
 
   // All charged particles are potential recoilers.
   vector <int> recPositions( const Event& state, int iRad, int iEmt) {
     if ( state[iRad].isFinal() || state[iRad].id() != idRadAfterSave
       || state[iEmt].id() != -idRadAfterSave) return vector<int>();
     // Particles to exclude as recoilers.
     vector<int> iExc(createvector<int>(iRad)(iEmt));
     // Find charged particles.
     vector<int> recs;
     for (int i=0; i < state.size(); ++i) {
       if ( find(iExc.begin(), iExc.end(), i) != iExc.end() ) continue;
       if ( state[i].isLepton() || state[i].idAbs() == 900012) {
         if (state[i].isFinal())
           recs.push_back(i);
         if (state[i].mother1() == 1 && state[i].mother2() == 0)
           recs.push_back(i);
         if (state[i].mother1() == 2 && state[i].mother2() == 0)
           recs.push_back(i);
       }
     }
     // Done.
     return recs;
   }
 
   // All charged particles are potential recoilers.
   int set_nCharged( const Event& state) {
     // Find charged particles.
     int nch=0;
     for (int i=0; i < state.size(); ++i) {
       if ( state[i].isLepton() || state[i].idAbs() == 900012 ) {
         if (state[i].isFinal()) nch++;
         if (state[i].mother1() == 1 && state[i].mother2() == 0) nch++;
         if (state[i].mother1() == 2 && state[i].mother2() == 0) nch++;
       }
     }
     // Done.
     nchSaved = nch;
     return nch;
   }
 
   // Pick z for new splitting.
   double zSplit(double zMinAbs, double zMaxAbs, double /*m2dip*/) {
       return (zMinAbs + rndmPtr->flat() * (zMaxAbs - zMinAbs));
   }
 
   // New overestimates, z-integrated versions.
   double overestimateInt(double zMinAbs,double zMaxAbs,
     double /*pT2Old*/, double /*m2dip*/, int /*order*/ = -1) {
     double preFac = symmetryFactor() * gaugeFactor();
     double wt     = 2. *enhance * preFac * 0.5 * ( zMaxAbs - zMinAbs);
     return wt;
   }
 
   // Return kernel for new splitting.
   double overestimateDiff(double /*z*/, double /*m2dip*/, int /*order*/ = -1) {
     double preFac = symmetryFactor() * gaugeFactor();
     double wt     = 2. *enhance * preFac * 0.5;
     return wt;
   }
 
   // Functions to calculate the kernel from SplitInfo information.
   bool calc(const Event& state, int orderNow) {
 
     // Dummy statement to avoid compiler warnings.
     if (false) cout << state[0].e() << orderNow << endl;
 
     // Read all splitting variables.
     double z(splitInfo.kinematics()->z), pT2(splitInfo.kinematics()->pT2),
       m2dip(splitInfo.kinematics()->m2Dip),
       m2Rad(splitInfo.kinematics()->m2RadAft),
       m2Rec(splitInfo.kinematics()->m2Rec),
       m2Emt(splitInfo.kinematics()->m2EmtAft);
     int splitType(splitInfo.type);
 
     // Set number of recoilers.
     set_nCharged(state);
 
     double wt = 0.;
     double preFac = symmetryFactor() * gaugeFactor();
     double kappa2 = pT2/m2dip;
     wt  = preFac
         * (pow(1.-z,2.) + pow(z,2.));
 
     // Correction for massive splittings.
     bool doMassive = (abs(splitType) == 2);
 
     if (doMassive) {
 
       double vijk = 1., pipj = 0.;
 
       // splitType == 2 -> Massive FF
       if (splitType == 2) {
         // Calculate CS variables.
         double yCS = kappa2 / (1.-z);
         double nu2Rad = m2Rad/m2dip;
         double nu2Emt = m2Emt/m2dip;
         double nu2Rec = m2Rec/m2dip;
         vijk          = pow2(1.-yCS) - 4.*(yCS+nu2Rad+nu2Emt)*nu2Rec;
         vijk          = sqrt(vijk) / (1-yCS);
         pipj          = m2dip * yCS /2.;
 
       // splitType ==-2 -> Massive FI
       } else if (splitType ==-2) {
         // Calculate CS variables.
         double xCS = 1 - kappa2/(1.-z);
         vijk   = 1.;
         pipj   = m2dip/2. * (1-xCS)/xCS;
       }
 
       // Reset kernel for massive splittings.
       wt = preFac * 1. / vijk * ( pow2(1.-z) + pow2(z)
                                       + m2Emt / ( pipj + m2Emt) );
     }
 
     // Multiply with z factor
     if (idRadAfterSave > 0) wt *= z;
     else                    wt *= 1.-z;
 
     // Trivial map of values, since kernel does not depend on coupling.
     unordered_map<string,double> wts;
     wts.insert( make_pair("base", wt ));
     if (doVariations) {
       // Create muR-variations.
       if (settingsPtr->parm("Variations:muRfsrDown") != 1.)
         wts.insert( make_pair("Variations:muRfsrDown", wt ));
       if (settingsPtr->parm("Variations:muRfsrUp")   != 1.)
         wts.insert( make_pair("Variations:muRfsrUp", wt ));
     }
 
     // Store kernel values.
     clearKernels();
     for ( unordered_map<string,double>::iterator it = wts.begin();
       it != wts.end(); ++it )
       kernelVals.insert(make_pair( it->first, it->second ));
 
     return true;
   }
 
 };
 
 //==========================================================================
 
 class Dire_fsr_u1new_A2SS : public Dire_fsr_u1new_A2FF {
 
 public:
 
   Dire_fsr_u1new_A2SS(int idRadAfterIn, string idIn, int softRS,
     Settings* settings,
     ParticleData* particleData, Rndm* rndm, BeamParticle* beamA,
     BeamParticle* beamB, CoupSM* coupSM, Info* info, DireInfo* direInfo)
       : Dire_fsr_u1new_A2FF(idRadAfterIn, idIn, softRS, settings, particleData,
         rndm, beamA, beamB, coupSM, info, direInfo) {}
 
 };
 
 //==========================================================================
 
 class Dire_isr_u1new_Q2QA : public DireSplittingU1new {
 
 public:
 
   Dire_isr_u1new_Q2QA(string idIn, int softRS, Settings* settings,
     ParticleData* particleData, Rndm* rndm, BeamParticle* beamA,
     BeamParticle* beamB, CoupSM* coupSM, Info* info, DireInfo* direInfo) :
     DireSplittingU1new(idIn, softRS, settings, particleData, rndm, beamA,
       beamB, coupSM, info, direInfo){}
 
   bool canRadiate ( const Event&, pair<int,int>,
     unordered_map<string,bool> = unordered_map<string,bool>(),
     Settings* = nullptr, PartonSystems* = nullptr, BeamParticle* = nullptr);
   bool canRadiate ( const Event&, int iRadBef, int iRecBef,
     Settings* = nullptr, PartonSystems* = nullptr, BeamParticle* = nullptr);
 
   int kinMap ();
 
   // Return id of mother after splitting.
   int motherID(int idDaughter);
 
   // Return id of emission.
   int sisterID(int idDaughter);
 
   // Return id of recombined radiator (before splitting!)
   int radBefID(int idRadAfter, int idEmtAfter);
 
   // Return colours of recombined radiator (before splitting!)
   pair<int,int> radBefCols(int colRadAfter, int acolRadAfter,
     int colEmtAfter, int acolEmtAfter);
 
   double gaugeFactor ( int=0, int=0 );
   double symmetryFactor ( int=0, int=0 );
 
   vector <int> recPositions( const Event& state, int iRad, int iEmt);
 
   // Pick z for new splitting.
   double zSplit(double zMinAbs, double zMaxAbs, double m2dip);
 
   // New overestimates, z-integrated versions.
   double overestimateInt(double zMinAbs,double zMaxAbs,
     double pT2Old, double m2dip, int order = -1);
 
   // Return kernel for new splitting.
   double overestimateDiff(double z, double m2dip, int order = -1);
 
   // Functions to calculate the kernel from SplitInfo information.
   bool calc(const Event& state = Event(), int order = -1);
 
 };
 
 class Dire_isr_u1new_A2QQ : public DireSplittingU1new {
 
 public:
 
   Dire_isr_u1new_A2QQ(string idIn, int softRS, Settings* settings,
     ParticleData* particleData, Rndm* rndm, BeamParticle* beamA,
     BeamParticle* beamB, CoupSM* coupSM, Info* info, DireInfo* direInfo) :
     DireSplittingU1new(idIn, softRS, settings, particleData, rndm, beamA,
       beamB, coupSM, info, direInfo){}
 
   bool canRadiate ( const Event&, pair<int,int>,
     unordered_map<string,bool> = unordered_map<string,bool>(),
     Settings* = nullptr, PartonSystems* = nullptr, BeamParticle* = nullptr);
   bool canRadiate ( const Event&, int iRadBef, int iRecBef,
     Settings* = nullptr, PartonSystems* = nullptr, BeamParticle* = nullptr);
 
   int kinMap ();
 
   // Return id of mother after splitting.
   int motherID(int idDaughter);
 
   // Return id of emission.
   int sisterID(int idDaughter);
 
   // Return id of recombined radiator (before splitting!)
   int radBefID(int idRadAfter, int idEmtAfter);
 
   // Return colours of recombined radiator (before splitting!)
   pair<int,int> radBefCols(int colRadAfter, int acolRadAfter,
     int colEmtAfter, int acolEmtAfter);
 
   double gaugeFactor ( int=0, int=0 );
   double symmetryFactor ( int=0, int=0 );
 
   // Pick z for new splitting.
   double zSplit(double zMinAbs, double zMaxAbs, double m2dip);
 
   // New overestimates, z-integrated versions.
   double overestimateInt(double zMinAbs,double zMaxAbs,
     double pT2Old, double m2dip, int order = -1);
 
   // Return kernel for new splitting.
   double overestimateDiff(double z, double m2dip, int order = -1);
 
   // Functions to calculate the kernel from SplitInfo information.
   bool calc(const Event& state = Event(), int order = -1);
 
 };
 
 class Dire_isr_u1new_Q2AQ : public DireSplittingU1new {
 
 public:
 
   Dire_isr_u1new_Q2AQ(string idIn, int softRS, Settings* settings,
     ParticleData* particleData, Rndm* rndm, BeamParticle* beamA,
     BeamParticle* beamB, CoupSM* coupSM, Info* info, DireInfo* direInfo) :
     DireSplittingU1new(idIn, softRS, settings, particleData, rndm, beamA,
       beamB, coupSM, info, direInfo){}
 
   bool canRadiate ( const Event&, pair<int,int>,
     unordered_map<string,bool> = unordered_map<string,bool>(),
     Settings* = nullptr, PartonSystems* = nullptr, BeamParticle* = nullptr);
   bool canRadiate ( const Event&, int iRadBef, int iRecBef,
     Settings* = nullptr, PartonSystems* = nullptr, BeamParticle* = nullptr);
 
   int kinMap ();
 
   // Return id of mother after splitting.
   int motherID(int idDaughter);
 
   // Return id of emission.
   int sisterID(int idDaughter);
 
   // Return id of recombined radiator (before splitting!)
   int radBefID(int idRadAfter, int idEmtAfter);
 
   // Return colours of recombined radiator (before splitting!)
   pair<int,int> radBefCols(int colRadAfter, int acolRadAfter,
     int colEmtAfter, int acolEmtAfter);
 
   double gaugeFactor ( int=0, int=0 );
   double symmetryFactor ( int=0, int=0 );
 
   // Pick z for new splitting.
   double zSplit(double zMinAbs, double zMaxAbs, double m2dip);
 
   // New overestimates, z-integrated versions.
   double overestimateInt(double zMinAbs,double zMaxAbs,
     double pT2Old, double m2dip, int order = -1);
 
   // Return kernel for new splitting.
   double overestimateDiff(double z, double m2dip, int order = -1);
 
   // Functions to calculate the kernel from SplitInfo information.
   bool calc(const Event& state = Event(), int order = -1);
 
 };
 
 class Dire_isr_u1new_L2LA : public DireSplittingU1new {
 
 public:
 
   Dire_isr_u1new_L2LA(string idIn, int softRS, Settings* settings,
     ParticleData* particleData, Rndm* rndm, BeamParticle* beamA,
     BeamParticle* beamB, CoupSM* coupSM, Info* info, DireInfo* direInfo) :
     DireSplittingU1new(idIn, softRS, settings, particleData, rndm, beamA,
       beamB, coupSM, info, direInfo){}
 
   bool canRadiate ( const Event&, pair<int,int>,
     unordered_map<string,bool> = unordered_map<string,bool>(),
     Settings* = nullptr, PartonSystems* = nullptr, BeamParticle* = nullptr);
   bool canRadiate ( const Event&, int iRadBef, int iRecBef,
     Settings* = nullptr, PartonSystems* = nullptr, BeamParticle* = nullptr);
 
   int kinMap ();
 
   // Return id of mother after splitting.
   int motherID(int idDaughter);
 
   // Return id of emission.
   int sisterID(int idDaughter);
 
   // Return id of recombined radiator (before splitting!)
   int radBefID(int idRadAfter, int idEmtAfter);
 
   // Return colours of recombined radiator (before splitting!)
   pair<int,int> radBefCols(int colRadAfter, int acolRadAfter,
     int colEmtAfter, int acolEmtAfter);
 
   double gaugeFactor ( int=0, int=0 );
   double symmetryFactor ( int=0, int=0 );
 
   vector <int> recPositions( const Event& state, int iRad, int iEmt);
 
   // Pick z for new splitting.
   double zSplit(double zMinAbs, double zMaxAbs, double m2dip);
 
   // New overestimates, z-integrated versions.
   double overestimateInt(double zMinAbs,double zMaxAbs,
     double pT2Old, double m2dip, int order = -1);
 
   // Return kernel for new splitting.
   double overestimateDiff(double z, double m2dip, int order = -1);
 
   // Functions to calculate the kernel from SplitInfo information.
   bool calc(const Event& state = Event(), int order = -1);
 
 };
 
 class Dire_isr_u1new_A2LL : public DireSplittingU1new {
 
 public:
 
   Dire_isr_u1new_A2LL(string idIn, int softRS, Settings* settings,
     ParticleData* particleData, Rndm* rndm, BeamParticle* beamA,
     BeamParticle* beamB, CoupSM* coupSM, Info* info, DireInfo* direInfo) :
     DireSplittingU1new(idIn, softRS, settings, particleData, rndm, beamA,
       beamB, coupSM, info, direInfo){}
 
   bool canRadiate ( const Event&, pair<int,int>,
     unordered_map<string,bool> = unordered_map<string,bool>(),
     Settings* = nullptr, PartonSystems* = nullptr, BeamParticle* = nullptr);
   bool canRadiate ( const Event&, int iRadBef, int iRecBef,
     Settings* = nullptr, PartonSystems* = nullptr, BeamParticle* = nullptr);
 
   int kinMap ();
 
   // Return id of mother after splitting.
   int motherID(int idDaughter);
 
   // Return id of emission.
   int sisterID(int idDaughter);
 
   // Return id of recombined radiator (before splitting!)
   int radBefID(int idRadAfter, int idEmtAfter);
 
   // Return colours of recombined radiator (before splitting!)
   pair<int,int> radBefCols(int colRadAfter, int acolRadAfter,
     int colEmtAfter, int acolEmtAfter);
 
   double gaugeFactor ( int=0, int=0 );
   double symmetryFactor ( int=0, int=0 );
 
   // Pick z for new splitting.
   double zSplit(double zMinAbs, double zMaxAbs, double m2dip);
 
   // New overestimates, z-integrated versions.
   double overestimateInt(double zMinAbs,double zMaxAbs,
     double pT2Old, double m2dip, int order = -1);
 
   // Return kernel for new splitting.
   double overestimateDiff(double z, double m2dip, int order = -1);
 
   // Functions to calculate the kernel from SplitInfo information.
   bool calc(const Event& state = Event(), int order = -1);
 
 };
 
 class Dire_isr_u1new_L2AL : public DireSplittingU1new {
 
 public:
 
   Dire_isr_u1new_L2AL(string idIn, int softRS, Settings* settings,
     ParticleData* particleData, Rndm* rndm, BeamParticle* beamA,
     BeamParticle* beamB, CoupSM* coupSM, Info* info, DireInfo* direInfo) :
     DireSplittingU1new(idIn, softRS, settings, particleData, rndm, beamA,
       beamB, coupSM, info, direInfo){}
 
   bool canRadiate ( const Event&, pair<int,int>,
     unordered_map<string,bool> = unordered_map<string,bool>(),
     Settings* = nullptr, PartonSystems* = nullptr, BeamParticle* = nullptr);
   bool canRadiate ( const Event&, int iRadBef, int iRecBef,
     Settings* = nullptr, PartonSystems* = nullptr, BeamParticle* = nullptr);
 
   int kinMap ();
 
   // Return id of mother after splitting.
   int motherID(int idDaughter);
 
   // Return id of emission.
   int sisterID(int idDaughter);
 
   // Return id of recombined radiator (before splitting!)
   int radBefID(int idRadAfter, int idEmtAfter);
 
   // Return colours of recombined radiator (before splitting!)
   pair<int,int> radBefCols(int colRadAfter, int acolRadAfter,
     int colEmtAfter, int acolEmtAfter);
 
   double gaugeFactor ( int=0, int=0 );
   double symmetryFactor ( int=0, int=0 );
 
   // Pick z for new splitting.
   double zSplit(double zMinAbs, double zMaxAbs, double m2dip);
 
   // New overestimates, z-integrated versions.
   double overestimateInt(double zMinAbs,double zMaxAbs,
     double pT2Old, double m2dip, int order = -1);
 
   // Return kernel for new splitting.
   double overestimateDiff(double z, double m2dip, int order = -1);
 
   // Functions to calculate the kernel from SplitInfo information.
   bool calc(const Event& state = Event(), int order = -1);
 
 };
 
 //==========================================================================
 
 } // end namespace Pythia8
 
 #endif // end Pythia8_DireSplittingsU1new_H

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