Problem 362 - Leptonic tau decays are not V-A
Summary: Leptonic tau decays are not V-A
Status: RESOLVED FIXED
Alias: None
Product: Geant4
Classification: Unclassified
Component: particles (show other problems)
Version: 4.0
Hardware: All All
: P4 minor
Assignee: kurasige
URL:
Depends on:
Blocks:
 
Reported: 2002-03-06 18:31 CET by dennis.herbert.wright
Modified: 2002-03-26 00:51 CET (History)
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Description dennis.herbert.wright 2002-03-06 18:31:02 CET 
The tau decays tau+ -> e+  v_e  v_tau_bar
                    -> mu+ v_mu v_tau_bar
               tau- -> e-  v_e_bar  v_tau
                    -> mu- v_mu_bar v_tau

are currently described as phase space decays (G4PhaseSpaceDecayChannel)
but should be V-A decays like G4MuonDecayChannel.

Perhaps G4MuonDecayChannel could be generalized to accept a daughter argument
and then it could be used to describe leptonic tau decays as well as mu decays.
Comment 1 kurasige 2002-03-06 21:01:59 CET 
G4MuonDecayChannel can not be used because muon mass can not be neglected with
respect to energy of muon and tau mass.
G4TauLeptonicChannel will be introduced in the next version.
Comment 2 kurasige 2002-03-06 21:03:59 CET 
G4MuonDecayChannel can not be used because muon mass can not be neglected with
respect to energy of muon and tau mass in the decay of tau -> mu + nu + nu.
G4TauLeptonicChannel will be introduced in the next version.
Comment 3 kurasige 2002-03-26 00:51:59 CET 
New class of G4TauLeptonicDecayChannel will be included in the next release.