MuLan Measurement of the Positive Muon Lifetime and Determination of the Fermi Constant

2013/01/03 by T. P. Gorringe, Gorringe, T. P.
Engineering · Physics and Astronomy · #Atomic and Subatomic Physics Research #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #Instrumentation and Detectors (physics.ins-det) #Muon and positron interactions and applications #Nuclear Experiment (nucl-ex) #Particle physics theoretical and experimental studies

paper · pdf · doi:10.48550/arxiv.1301.0504

openalex publication_date 2013/01/03 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We report results from the MuLan measurement of the positive muon lifetime. The experiment was conducted at the Paul Scherrer Institute using a time-structured surface muon beam and a segmented plastic scintillator array. Two different 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. From a total of 1.6 x 10¹² decays, we obtained the muon lifetime tau_mu = 2196980.3(2.2) ps (1.0 ppm) and Fermi constant G_F = 1.1663787(6) x 10^-5 GeV^-2 (0.5 ppm).

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