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Re: Pnd4CFitter - how to use it [message #15386 is a reply to message #15385] Fri, 30 August 2013 15:40 Go to previous messageGo to previous message
StefanoSpataro is currently offline  StefanoSpataro
Messages: 2736
Registered: June 2005
Location: Torino
first-grade participant

From: 2.235.190*
The 4-contraints fit forces the final 4-momentum, sum of the decay products, to be exactly like the initial one.

If you have a formation experiment, i.e. pbarp->h_c, then you can use the 4C fitter since you know the p at rest and the projectile pbar, but if you have a reaction like pbarp->DD you cannot use it to force the mass of one single D, since you don't know its initial 4-momentum. You can force the DD state, but not the single D.

I suppose this is ther eason why it does not work in your case.
 
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