Test if particles are based on the same object

XSAME (I,J)

= .TRUE. if tracks I and J or one of their daughters, granddaughters, etc. are based on the same object (see 7.6) or, in other words, belong to the same family (see 10.2.3). I and J must both be reconstructed tracks or MC particles; they may, however, belong to different Lorentz frames. XSAME uses the same bit masks as the lock algorithm. XSAME(IJET,ITK) can be used for testing whether a track ITK belongs to a given jet (see 10.3). An example how to use XSAME in reconstructing decay chains is given in 7.4.5, example 2.