Vertex Refitting

Updated on Tue, 2016-02-02 15:05. Originally created by amcw7777 on 2015-04-16 09:38.

This is blog about vertex refitting

Motivation

Removing the secondary vertex when we fit the primary vertex

Method

Using KFVertex Finder, refit primary vertex using

1. all tracks;

2. removing D0 daughters;

Result

Comparison of refitted vertices and primary vertex

This is the difference of refitted vertex using all tracks, to original primary vertex.

And this is the difference between two refitted vertices.

The result using 13M event is:

The result before is like