MET computation does not take into account yet anti-taus
Currently the MET computation only takes into account loose taus https://gitlab.cern.ch/easyjet/easyjet/-/blob/main/EasyjetHub/python/algs/calibration/met.py?ref_type=heads#L22
For data-driven background where anti-taus will also be used, the computation should also take into account those anti-taus.
FYI @mfujimot