Home » PANDA » PandaRoot » Analysis » Vertex Fitter in Fast simulation
| Re: Vertex Fitter in Fast simulation [message #16412 is a reply to message #16407] |
Tue, 22 April 2014 19:41   |
Malte Albrecht
Messages: 11
Registered: May 2012
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occasional visitor |
From: *ep1.ruhr-uni-bochum.de
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Hi Ralf,
thanks for your changes today, now my pulls and chi2 / Prob histograms look good. Actually what did the trick, are your changes to the calculation of the jacobian and the covPol, right?
Anyway, I did just a quick check, but 4C and mass constraint fits seem to be operational now.
Now one more question: How are staged fits handled? If I want a mass constraint fit (e.g. for an eta) and after that a 4C fit using the already pre-fitted 4vector of my mass-constrained-eta (which would then actually be a 5C-fit, but ok...) ?
From other fitters I just know, that one can add MassConstraints, or FourVector-constraints as many as one likes, but in the end one can still fit everything _together_ with one fitter object. Can I do something similar here, or do I always have to create new RhoCandidates and give them to the next fitter?
Greetings,
Malte
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