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>> (2) What is IdBtrue?
> 
> What it should be, but somehow the code is broken. The class is defined in
> BRecoTools/RecoilMCUtils.hh/cc. If I look at the code I don't understand
> why we get 1 for the ID.

There is a typo in the filling of the ntuple:
ntuple()->column("IdBtrue",fIdBtrue, "B" );
should actually be
ntuple()->column("IdBtrue",fIdBtrue, 0,"B" );
                                      ^
                                      |

Cheers,

Roberto