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None Muon decay 

Forum: Particles
Date: 04 Jan, 2011
From: Pietro Bonfa' <Pietro Bonfa'>

Hi everybody, I have a problem with muon decay at rest, here's the log:

### Run 0 start.
Start Run processing.
=====================================
  G4EventManager::ProcessOneEvent()  
=====================================
1 vertices passed from G4Event.
G4PrimaryTransformer::PrimaryVertex (0(mm),0(mm),0(mm),0(nsec))
Primary particle (mu+) --- Transfered with momentum (0,0,-0)
A new track 0x197dc10 (trackID 1, parentID 0) is passed to G4StackManager.
1 primaries are passed from G4EventTransformer.
!!!!!!! Now start processing an event !!!!!!!
### pop requested out of 1 stacked tracks.
Track 0x197dc10 (trackID 1, parentID 0) is passed to G4TrackingManager.

*********************************************************************************************************
* G4Track Information:   Particle = mu+,   Track ID = 1,   Parent ID = 0
*********************************************************************************************************

Step#      X         Y         Z        KineE    dEStep   StepLeng  TrakLeng    Volume     Process
    0      0 fm      0 fm      0 fm      0 eV      0 eV      0 fm      0 fm      Tracker    initStep
    1      0 fm      0 fm      0 fm      0 eV      0 eV      0 fm      0 fm      Tracker  DecayWithSpin
    :----- List of 2ndaries - #SpawnInStep=  6(Rest= 6,Along= 0,Post= 0), #SpawnTotal=  6 ---------------
    :      0 fm      0 fm      0 fm   39.8 MeVanti_nu_mu
    :      0 fm      0 fm      0 fm   39.5 MeV      nu_e
    :      0 fm      0 fm      0 fm   25.8 MeV        e+
    :      0 fm      0 fm      0 fm   46.2 MeVanti_nu_mu
    :      0 fm      0 fm      0 fm   9.34 MeV      nu_e
    :      0 fm      0 fm      0 fm   49.6 MeV        e+
    :----------------------------------------------------------------- EndOf2ndaries Info ---------------

Brief description: a muon at rest is created in (0,0,0) in vacuum by the particle gun of example N02. A magnetic field could be present but does not chenge the final result.

Does anybody have an idea why one muon is decaying in 2 positrons? This happens quite often (1 out of 5 times)!

Thanks in advance for your reply. Pietro Bonfa'

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