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Re: EvtGen Output Fixed Point Precision [message #9008 is a reply to message #9007] Thu, 16 July 2009 18:07 Go to previous messageGo to previous message
Marius Mertens is currently offline  Marius Mertens
Messages: 55
Registered: January 2009
continuous participant
From: *ikp.kfa-juelich.de
Hi Stefano,

one example I just took from an event file looks like this:

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When you calculate the mass of particle 4, it evaluates to 142.266MeV.

The maximum error in mass due to rounding at 4 digits precision is
err_max=0.05MeV*(E+px+py+pz)/sqrt(E^2-px^2-py^2-pz^2)
It is admittedly not very likely that the maximum error is indeed achieved, but it does happen.
 
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