Our muon lifetime experiment (MuLan Collaboration),  at the Paul Scherrer Institut,  which grew out of Brookhaven E821, has published a 1 ppm measurement of the muon lifetime in Physical Review Letters, which improves the precision of the Fermi constant for muon decay. See Phys. Rev. Lett. 106, 041803 (2011), and Phys.Rev. D 87, 052003 (2013)