Apparently, when analysing events from particle detectors, one may incur in double-counting, which happens when
a physics object appears as a single object of its own type, but it may also be part of a jet)
(which I found on a CERN website).
I still don't really get it though, and I couldn't find anything online that properly explains it.
Can anyone shed some light on this, possible with a clear example? And how this issue could be dealt with?