SciPost Submission Page

The pion beta and radiative electronic decays

by D. Počanić

Submission summary

As Contributors: Dinko Pocanic
Preprint link: scipost_202105_00016v1
Date accepted: 2021-06-16
Date submitted: 2021-05-12 04:50
Submitted by: Pocanic, Dinko
Submitted to: SciPost Physics Proceedings
Proceedings issue: PSI Particle Physics
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).

Current status:
Publication decision taken: accept

Editorial decision: For Journal SciPost Physics Proceedings: Publish
(status: Editorial decision fixed and (if required) accepted by authors)

Submission & Refereeing History

Reports on this Submission

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


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)


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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