Problem 1716

Summary: eeToHadrons energies of secondaries much higher than primary
Product: Examples/Extended Reporter: belgin <fatma.belgin.pilicer>
Component: electromagnetic/TestEM5Assignee: Vladimir.Ivantchenko
Status: RESOLVED FIXED    
Severity: trivial    
Priority: P5    
Version: 10.1   
Hardware: All   
OS: All   

Description belgin 2015-02-18 17:33:42 CET
eeToHadrons energies of secondaries much higher than primary

Observed in extended/electromagnetic/TestEm6 in geant4-10-01 without any change in code,
with the following input

/tracking/verbose 2
/run/initialize
/testem/phys/SetAnnihiToHadronFac 10000
/gun/particle e+
/gun/energy 1.5 TeV
/run/beamOn 10

The output shows secondaries with energies like

   :----- List of secondaries ----------------
             pi+:  energy = 3.327 PeV  time = 127.6 ps 
             pi-:  energy = 309.7 TeV  time = 127.6 ps 
           gamma:  energy = 6.774 GeV  time = 127.6 ps 
    :------------------------------------------

or much higher than the gun particle.

We suspect incorrect use of Lorentz boost in G4eeToHadronsModel::SampleSecondaries.

Cheers, 
   Belgin and Helmut

fatma.belgin.pilicer@cern.ch
Helmut.Burkhardt@cern.ch
Comment 1 Vladimir.Ivantchenko 2015-02-20 11:08:09 CET
Thanks for the bug report. There were problems in kinematics of sampling. The fix will be available in the next patch to 10.1.

VI