Get Instance from Tree and Filtering tree with a lot of Branches

[fljs825]

Maybe this post might be similar to my problem.

Expanding or filtering array in TTree

Dear experts, for my analysis I need to apply a decay tree fit that constrains a set of starting points. Since for each event there could be more than one starting point, the fit has to run more than once. The result is stored as a list in my TTree, e.g.: root [3] t->Show(0) ... Lb_TAU = 0.000282896 Lb_dtflambda_PV_key = 0, 1, 2 ... Lb_dtflambda_Lambda0_pplus_PE = 17280.6, 17242.5, 25549.6 i.e. some entries are single values (such as Lb_TAU) and others are arrays (Lb_dtflambda_PV_…