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Home » PANDA » PandaRoot » Fast Simulations » [FIXED] Problem with mass constraint fit for two gamma
Re: Problem with mass constraint fit for two gamma [message #16948 is a reply to message #16938] Sun, 06 July 2014 06:09 Go to previous messageGo to previous message
StefanoSpataro is currently offline  StefanoSpataro
Messages: 2736
Registered: June 2005
Location: Torino
first-grade participant

From: 140.181.11*
Before starting to calculate matrices, if I were in you I would check first the actual code.

First, is the information stored in the neutral candidate correct? Or is maybe the error matrix somehow bugged? Maybe something in the initialization went wrong? When I launch a pid macro i can see the following error:

-I- FairRunTimeDB::InitContainer() PndEmcErrorMatrixPar
[ERROR  ] init() PndEmcErrorMatrixPar  not initialized 


I could suspect the par is not properly loaded.

Then, if I launch the photon simulation I can see fCov[15] is not set (it is at zero) while fErrP7[28] has strange numbers, also negative (-30?). If I do GetErrorP7() I obtain something at 10^6!
Are we sure the correct data members are properly filled? Which variables are needed really for the kinematic fitters? Maybe we are just filling the wrong thing, or maybe we are filling it in the wrong way (i.e. position inverted with momentum, mass at the beginning and not at the end, the usual stuff).

Could you please someone do such checks?

 
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