TY  - JOUR
PB  - SciPost Foundation
DO  - 10.21468/SciPostPhysProc.5.016
TI  - Mulan: a part-per-million measurement of the muon lifetime and determination of the Fermi constant
PY  - 2021/09/06
UR  - https://scipost.org/SciPostPhysProc.5.016
JF  - SciPost Physics Proceedings
JA  - SciPost Phys. Proc.
VL  - 
IS  - 5
SP  - 016
A1  - Carey, Rebecca
AU  - Gorringe, Tim
AU  - Hertzog, David
AB  - The part-per-million measurement of the positive muon lifetime and determination of the Fermi constant by the MuLan experiment at the Paul Scherrer Institute is reviewed. The experiment used an innovative, time-structured, surface muon beam and a near-4π, finely-segmented, plastic scintillator positron detector. Two in-vacuum muon stopping targets were used: a ferromagnetic foil with a large internal magnetic field, and a quartz crystal in a moderate external magnetic field. The experiment acquired a dataset of 1.6e12 positive muon decays and obtained a muon lifetime τ_µ = 2 196 980.3(2.2) ps (1.0 ppm) and Fermi constant G_F = 1.166 378 7(6) × 10−5 GeV^−2 (0.5 ppm). The thirty fold improvement in τ_µ has proven valuable for precision measurements in nuclear muon capture and the commensurate improvement in G_F has proven valuable for precision tests of the standard model.
ER  -

@Article{10.21468/SciPostPhysProc.5.016,
	title={{Mulan: a part-per-million measurement of the muon lifetime and determination of the Fermi constant}},
	author={R. Carey and T. Gorringe and D.W. Hertzog},
	journal={SciPost Phys. Proc.},
	pages={016},
	year={2021},
	publisher={SciPost},
	doi={10.21468/SciPostPhysProc.5.016},
	url={https://scipost.org/10.21468/SciPostPhysProc.5.016},
}