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[FIXED] EvtGen J/psi decay [message #17129] Sun, 03 August 2014 11:54 Go to previous message
Alexandr Zinchenko is currently offline  Alexandr Zinchenko
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Registered: May 2009
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I was running macros from the tutorials/rho directory, where a simple decay chain is considered described
in psi2s_Jpsi2pi_Jpsi_mumu.dec file. There J/psi is forced to decay into 2 muons:
Decay J/psi
1.0 mu+ mu- VLL;
As far as I could understand from some EvtGen manuals, this should be an EXPLICIT 2-muon decay. But, when running
tut_ana_mclist.C macro, I can see that for quite a few events in addition to 2 muons there (is) are extra photon(s) produced
in J/psi decay (I suppose, the radiative corrections are switched on - which should not be the case to my understanding).
Can anybody comment on this?

[Updated on: Wed, 10 September 2014 12:37] by Moderator

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