SciPost Submission Page

Muon Decay

by W. Fetscher

Submission summary

As Contributors: Wulf Fetscher
Preprint link: scipost_202106_00032v3
Date accepted: 2021-07-15
Date submitted: 2021-07-06 18:08
Submitted by: Fetscher, Wulf
Submitted to: SciPost Physics Proceedings
Proceedings issue: Review of Particle Physics at PSI
Academic field: Physics
  • High-Energy Physics - Experiment
  • High-Energy Physics - Theory
  • High-Energy Physics - Phenomenology
Approaches: Theoretical, Experimental, Phenomenological


The decay of the muon has been studied at PSI with several precision measurements: The longitudinal polarization PL(E) with the muon decay parameters ξ′, ξ′′, the Time- Reversal Invariance (TRI) conserving transverse polarization PT1(E) with the muon de- cay parameters η, η′′, the TRI violating transverse polarization PT2(E), with α′/A, β′/A and the muon decay asymmetry with Pμξ. The detailed theoretical analysis of all mea- surements of normal and inverse muon decay has led for the first time to a lower limit |g V | > 0.960 ("V − A") and upper limits for nine other possible complex couplings, espe- cially the scalar coupling |g S | < 0.550 which had not been excluded before.

Published as SciPost Phys. Proc. 5, 006 (2021)

Author comments upon resubmission

The detailed form of the Gamma^\gamma matrices is not relevant for the rest of this paper, since the important physics is contained in the ten complex coupling constants.

List of changes

I have changed the section title: 6.2 Hamiltonian -> General Matrix Element;
It is now noted that the \Gamma^\gamma are either Dirac or Pauli matrices.
\noindent is used after Eq. (6.1)

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