Problem 1716 - eeToHadrons energies of secondaries much higher than primary
Summary: eeToHadrons energies of secondaries much higher than primary
Status: RESOLVED FIXED
Alias: None
Product: Examples/Extended
Classification: Unclassified
Component: electromagnetic/TestEM5 (show other problems)
Version: 10.1
Hardware: All All
: P5 trivial
Assignee: Vladimir.Ivantchenko
URL:
Depends on:
Blocks:
 
Reported: 2015-02-18 17:33 CET by belgin
Modified: 2015-02-20 11:08 CET (History)
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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