Belle2::ParticleListName Namespace Reference

Helper to deal with ParticleList names. More...

Functions
std::string	antiParticleListName (const std::string &listName)
	Returns name of anti-particle-list corresponding to listName.

Detailed Description

Helper to deal with ParticleList names.

Own namespace because of CINT.

Function Documentation

antiParticleListName()

std::string antiParticleListName

(

const std::string &

listName

)

Returns name of anti-particle-list corresponding to listName.

Throws std::runtime_error for invalid particle lists. If listName refers to a self-conjugated list, simply returns listName.

Ex: antiParticleListName("B+:somelabel") -> "B-:somelabel" antiParticleListName("gamma") -> "gamma"

User documentation is located at analysis/doc/DecayDescriptor.rst Please modify in accordingly to introduced changes.

Definition at line 17 of file ParticleListName.cc.

{
  DecayDescriptor decayDescriptor;
  bool valid = decayDescriptor.init(listName);
  if (!valid)
    throw std::runtime_error("Invalid ParticleList name: '" + listName + "' Should be EVTPDLNAME[:LABEL], e.g. B+ or B+:mylist.");
 
  int nProducts = decayDescriptor.getNDaughters();
  if (nProducts > 0)
    throw std::runtime_error("Invalid ParticleList name " + listName
                             + ". DecayString should not contain any daughters, only the mother particle.");
 
  const DecayDescriptorParticle* mother = decayDescriptor.getMother();
  const int pdgCode = mother->getPDGCode();
 
  bool isSelfConjugatedParticle = !(EvtPDLUtil::hasAntiParticle(pdgCode));
  if (isSelfConjugatedParticle)
    return listName;
  else
    return EvtPDLUtil::antiParticleListName(pdgCode, mother->getLabel());
}