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Re: MC Truth with EMC [message #18080 is a reply to message #17735] Thu, 26 March 2015 18:40 Go to previous message
StefanoSpataro is currently offline  StefanoSpataro
Messages: 2736
Registered: June 2005
Location: Torino
first-grade participant

From: *to.infn.it
Dear all,
I found last week that the EMC MC truth propagation had a logical problem, and I have (hopefully) fixed it.
Today i run as test pbarp -> pi+ pi- pi0 @ 4 GeV/c, checking the MC matching for the photons.

The following plots show, in linear and in log scale, the gamma-gamma invariant mass distribution for all the candidates (black), for the mc matched photons (blue), and for the matched photons coming from pi0.

index.php?t=getfile&id=8347&private=0
index.php?t=getfile&id=8348&private=0

From the plot I can argue that the MC matching works almost nicely, that the candidates are dominated by particles which are not photons, and that in the pi0 invariant mass there is still a low momentum tail. I could argue that the tail is coming from broken clusters (like between endcaps and barrel, or maybe problems of the clusterization, or maybe splitoffs).

I would be happy if somebody could take a look and try to understand what is going wrong.
  • Attachment: pi0_lin.gif
    (Size: 8.35KB, Downloaded 201 times)
  • Attachment: pi0_log.gif
    (Size: 8.64KB, Downloaded 193 times)
 
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