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Re: Vertex Fitter in Fast simulation [message #16329 is a reply to message #16233] Wed, 16 April 2014 00:05 Go to previous messageGo to previous message
Malte Albrecht is currently offline  Malte Albrecht
Messages: 11
Registered: May 2012
occasional visitor
From: *adsl.alicedsl.de
Hi!

I tried to perform 4C- as well as MassConstraint Fits in the fast sim. Using the PndKinFitter, as in Klaus' FastSim example works fine.
The MassConstraintFit does however not work... I tried the following:

PndKinFitter etaFit(etaCand);
etaFit.AddMassConstraint(0.547862);
etaFit.Fit();


etaCand in this example is a RhoCandidate* composed of two gammas.
The Fit always gives me:
Error in <TDecompLU::DecomposeLUCrout>: matrix is singular
Error in <TDecompLU::InvertLU>: matrix is singular, 0 diag elements < tolerance of 2.2204e-16


chi2 is always zero, and it seems the fit does not do anything...
Is it correct to use the PndKinFitter in that way? Whats going wrong here?

Thanks!
Best regards,
Malte

[Updated on: Wed, 16 April 2014 00:08]

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