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Note Re: Rare pion decay modes 

Forum: Hadronic Processes
Re: Question Rare pion decay modes (Tom Roberts)
Date: 18 May, 2010
From: Hisaya Kurashige <Hisaya Kurashige>

Hi, Tom

 We do not plan to implement rare decay modes.  
 Please add the decay mode in your application.

 As for the pi+ -> e+ + nu_e decay, insert following lines in your physics list.
 (Or anywhere after registration of physics list) 

-----------------------------------------------------------------
  G4ParticleDefinition*  pPi = G4PionPlus::PionPlusDefinition();
  G4DecayTable* table = pPi->GetDecayTable();

  // select pi -> mu + nu  and set BR = 1 - 1.23e-4
  G4VDecayChannel * cMuNu = table->GetDecayChannel(0);
  cMuNu->SetBR(1.0-1.23e-4);  

  // create pi -> e + nu channel and register it
  G4VDecayChannel* mode = new 
    G4PhaseSpaceDecayChannel("pi+",1.23e4,2,"e+","nu_e");
  table->Insert(mode); 
----------------------------------------------------------------------
 (Do not forget include "G4DecayTable.hh" and "G4PhaseSpaceDecayChannel.hh")    

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