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Re: eta_c generation with EvtGen [message #12843 is a reply to message #12842] Fri, 02 December 2011 20:52 Go to previous messageGo to previous message
StefanoSpataro is currently offline  StefanoSpataro
Messages: 2736
Registered: June 2005
Location: Torino
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From: *
I have tried to apply the same change for the psi channel, with the following dec:

spataro@briareos:~/trunk/pandaroot/macro/run/tdrct/psi3770$ cat psi3770_fix.dec
Decay pbarpSystem
1.0     D+  D-                          VSS;
Decay D-
1.0     K+ pi- pi-                      PHSP;
Decay D+
1.0     K- pi+ pi+                      PHSP;

The problem is that in this case pbarpSystem is not a vector, then I have the following error:

EvtGen:In readDecayFile, reading:psi3770_fix.dec
EvtGen:As requested, PHOTOS will be turned off.
EvtGen:VSS did not get the correct parent spin
pbarpSystem -> D+ D-  (VSS):
EvtGen:Will terminate execution!

I am not sure on what this VSS model is doing, now the question if it we should put phase space as model, or set the initial spin pf pbarpSystem to 1 in the evt.pdl... but there is no reason that a pbar p collision would have only a spin 1!
I could put phase space, but before starting I would like to know what we should use exactly...

Ok, I will run with Phase Space to save some time, wating for some comment on this side.

[Updated on: Fri, 02 December 2011 21:11]

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