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Re: New pbarpSystem and pbardSystem implementations [message #13196 is a reply to message #13193] Tue, 13 March 2012 17:16 Go to previous messageGo to previous message
Albrecht Gillitzer is currently offline  Albrecht Gillitzer
Messages: 49
Registered: March 2004
continuous participant
 From: *ikp.kfa-juelich.de
Hi,

Let me add some remarks concerning the pbar+d decay model:
It is based on one on-shell nucleon in the deuteron target not participating in the reaction (= the "spectator") while the other nucleon is off-shell to respect 4-momentum balance. The momentum distribution is parametrized with a Hulthen function.
Usually the struck (off-shell) nucleon is the neutron while the proton is the spectator (otherwise one would prefer a free proton target). However the decay model should also work for the latter case if the decay file is written accordingly.

As Stefano mentioned, there are two parameters in usage of the decay model:
Decay pbardSystem
1.0 p+ pbarnSystem DeuteronSpectator 1.0 1.16;
Enddecay
1st parameter: maximum internal momentum in the deuteron in GeV/c
2nd parameter: minimum mass of the residual pbar+n system for the specified decay (in this case M_phi+M_Pi-).

I plan to give a more detailed explanation in the next CM.

Albrecht

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