Thanks for passing by!

What makes the muon decay lifetime so much longer compared to the more unstable particles you describe?

Special relativity. You can calculate its lifetime and the fact that at high speed, time is dilated and lengths are contracted.

Is there a process/system in place at CERN & other particle physics labs which enables some kind of "indepedence of pre-decided measurement bias"?

A fraction of the recorded collisions are just randomly recorded. Those are the so-called minimum bias events, which allows to verify that we have not missed anything (this should also answer the second part of your comment).