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The pion beta and radiative electronic decays

by D. Počanić

This Submission thread is now published as

Submission summary

Authors (as registered SciPost users): Dinko Pocanic
Submission information
Preprint Link: scipost_202105_00016v1  (pdf)
Date accepted: 2021-06-16
Date submitted: 2021-05-12 04:50
Submitted by: Pocanic, Dinko
Submitted to: SciPost Physics Proceedings
Proceedings issue: Review of Particle Physics at PSI (PSI2020)
Ontological classification
Academic field: Physics
  • Nuclear Physics - Experiment
Approach: Experimental


As the lightest meson, pion offers unique opportunities for measuring parameters and testing limits of the Standard Model (SM). The PiBeta experiment, carried out at PSI, focused on SM tests accessible through the pion beta, π + → π 0 e + ν e (γ), and electronic radiative, π + → e + ν e γ, decay channels. We review the PiBeta experiment, and update the pion beta decay branching ratio B πβ^exp = 1.038(6) tot × 10 −8 , along with the corresponding derived value of the Cabibbo-Kobayashi-Maskawa matrix element V ud = 0.9738(28).

Published as SciPost Phys. Proc. 5, 024 (2021)

Submission & Refereeing History

Reports on this Submission

Report 2 by Adrian Signer on 2021-6-9 (Invited Report)

  • Cite as: Adrian Signer, Report on arXiv:scipost_202105_00016v1, delivered 2021-06-09, doi: 10.21468/SciPost.Report.3043


We (the editors Cy Hoffman, Klaus Kirch, Adrian Signer) had the
opportunity to review an earlier draft of the article and were in
communication with the authors before the submission. All our comments
and suggestions have been taken into account. Hence, we think the
paper can now be published in the current form.

  • validity: -
  • significance: -
  • originality: -
  • clarity: -
  • formatting: -
  • grammar: -

Anonymous Report 1 on 2021-6-1 (Invited Report)

  • Cite as: Anonymous, Report on arXiv:scipost_202105_00016v1, delivered 2021-06-01, doi: 10.21468/SciPost.Report.3009


The paper describes two experimental results of interest from the PiBeta experiment performed at PSI. The paper provides a minor update to the published value for the branching ratio of pion beta decay which agrees with standard model prediction but is not yet accurate enough to provide a competitive value for the CKM mixing coefficient V_ud. Nonetheless, it is a valuable contribution to particle physics. The paper also reviews previous results on radiative pion to electron decay.


No significant weaknesses were identified.


This paper is a good report describing two important particle physics results obtained at PSI involving fundamental aspects of pion decays . It meets the journal's acceptance criteria.

  • validity: high
  • significance: high
  • originality: good
  • clarity: good
  • formatting: good
  • grammar: excellent

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