PartonHistoryUtils.h

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/*
  Copyright (C) 2002-2026 CERN for the benefit of the ATLAS collaboration
*/

 
#ifndef PARTONS_PARTONHISTORYUTILS_H
#define PARTONS_PARTONHISTORYUTILS_H
 
#include "xAODTruth/TruthParticleContainer.h"
 
namespace CP {
using ROOT::Math::PtEtaPhiMVector;
 
namespace PartonHistoryUtils {
const xAOD::TruthParticle& findAfterFSR(const xAOD::TruthParticle& particle);
 
// determine whether potentialChild is child of parent
//
// A broken child truth link within nChildren() is treated as "not this child".
bool isChildOf(const xAOD::TruthParticle& parent,
               const xAOD::TruthParticle& potentialChild);

bool isBrokenTop(const xAOD::TruthParticle& particle);

bool isAfterFSR(const xAOD::TruthParticle& particle);

bool hasParticleIdenticalParent(const xAOD::TruthParticle& particle);
 
// Checking whether a particle has the same pdgId as its parent
//
// A particle with no parent, or a broken truth link to it, is treated as "no parent".
bool hasParentPdgId(const xAOD::TruthParticle& particle, int PdgId);
bool hasParentPdgId(const xAOD::TruthParticle& particle);
 
// Checking whether a particle has the same absolute pdgId as absPdgId
//
// A particle with no parent, or a broken truth link to it, is treated as "no parent".
bool hasParentAbsPdgId(const xAOD::TruthParticle& particle, int absPdgId);
 
// Checking whether a particle has an identical child
//
// A broken child truth link within nChildren() is treated as "no such child".
bool hasIdenticalChild(const xAOD::TruthParticle& particle);
 
// Checking whether a particle is a quark from the PDF (massless)
bool isQuarkFromPDF(const xAOD::TruthParticle& particle);
 
}  // namespace PartonHistoryUtils
}  // namespace CP
 
#endif