Improved Measurement of the Muon Lifetime and Determination of the Fermi Constant

TL;DR

This paper reports a highly precise measurement of the positive muon lifetime and the Fermi constant, significantly improving the accuracy of fundamental particle physics constants.

Contribution

The paper presents the most precise measurement to date of the muon lifetime and the Fermi constant, refining key parameters in particle physics.

Findings

Muon lifetime measured with 1.0 ppm precision

Fermi constant determined with 0.6 ppm precision

Results improve the accuracy of fundamental constants

Abstract

The MuLan collaboration has measured the lifetime of the positve muon to a precision of 1.0 parts per million. The Fermi constant is determined to a precision of 0.6 parts per million.