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icon4.gif  New pbarpSystem and pbardSystem implementations [message #13193] Tue, 13 March 2012 16:10 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,
few new implementations were done in EvtGen.

First all now, now you can set the spin of the initial pbar-p system, by using:
pbarpSystem0
pbarpSystem1
pbarpSystem2

The old pbarpSystem remains at the usual place, but please remember that it has spin 1 so you cannot use it with other models (i.e. the SVV used for eta_c).

Another note: if you use as initial state a particle, i.e. eta_c, in generation you will have an invariant mass resolution due to the particle width, and not to the beam momentum spread. For this reason we suggest to use pbarpSystem as initial state.


Morevoer, thanks to Albrecht we have a new model to simulate collisions antiproton-deuteron. In this case you have to use "pbardSystem" as initial state, and write a DEC file such as:

noPhotos
#
Decay pbardSystem
  1.0   p+  pbarnSystem		DeuteronSpectator 1.0 1.16;
Enddecay
#
Decay pbarnSystem
  1.0   pi- phi			PHSP;
Enddecay 
#
Decay phi
  1.0   K+ K-			VSS;
Enddecay
#
End


Maybe Albrecht could comment about the parameters to provide to the DeuteronSpectator model.
 
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