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Re: Bremsstrahlung and neutrals mergeing [message #16531 is a reply to message #16522] Wed, 07 May 2014 13:43 Go to previous messageGo to previous message
Elisa Fioravanti is currently offline  Elisa Fioravanti
Messages: 84
Registered: January 2008
continuous participant
 From: *fe.infn.it
Hello Klaus,

I tried the bremsstrahlung for the simulation of the decay:
chi_cj->J/psi gamma
with J/psi->e+e-

I first selected a J/psi from e+e- candidates, and then
I did a 4C fit to the chi_cj candidates.
If I look to the probability of the fit I obtained this distribution:
index.php?t=getfile&id=7853&private=0
with a peak at zero.

But when I simulated the same decay mode, using the same macro,
but without the bremsstrahlung, after the 4C fit I obtained this
probability distribution:
index.php?t=getfile&id=7854&private=0
uniform distributed from 0 to 1.

Do you have an idea on what's going on?

Thanks
Elisa
  • Attachment: bremm.png
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  • Attachment: nobremm.png
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