Difference: WorkBookOfflinePrimaryVertexFinding (40 vs. 41)

Revision 412009-01-13 - KatiLassilaPerini

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META TOPICPARENT name="WorkBookVertexReco"

7.4.1 Offline Primary Vertex Finding

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 Opening a data file in root, the data of the primary vertices (such as the coordinates, chi-squared, degrees of freedom) can be viewed direclty. More information on how to redo the primary vertex reconstruction is given in the offline guide.
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From CMSSW 1.8.0 onwards, if no reconstructed vertex is found in an event using the tracks, a vertex based on the [[WorkBookFindingBeamSpot][beam-spot] is put into the event. In this case, the vertex contains no tracks (as non have been used) , the chi^2 and the ndof are 0, and the flag isFake() is set to true.
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From CMSSW 1.8.0 onwards, if no reconstructed vertex is found in an event using the tracks, a vertex based on the [[SWGuideFindingBeamSpot][beam-spot] is put into the event. In this case, the vertex contains no tracks (as non have been used) , the chi^2 and the ndof are 0, and the flag isFake() is set to true.
 

 
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