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Measurement of the transverse polarization of electrons emitted in neutron decay – nTRV experiment
by K. Bodek, A. Kozela
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Submission summary
| Authors (as registered SciPost users): | Kazimierz Bodek |
| Submission information | |
|---|---|
| Preprint Link: | scipost_202103_00021v1 (pdf) |
| Date submitted: | 2021-03-22 15:56 |
| Submitted by: | Bodek, Kazimierz |
| Submitted to: | SciPost Physics Proceedings |
| Proceedings issue: | Review of Particle Physics at PSI (PSI2020) |
| Ontological classification | |
|---|---|
| Academic field: | Physics |
| Specialties: |
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| Approach: | Experimental |
Abstract
The two components of the transverse polarization of electrons ($\sigma_{T1}$ , $\sigma_T2$ ) emitted in the $\beta$-decay of polarized, free neutrons have been measured. The T-odd, P-odd correlation coefficient, $R$, quantifying $\sigma_T2$ , perpendicular to the neutron polarization and electron momentum, was found to be $0.004 \pm 0.012 \pm 0.005$. This value is consistent with time reversal invariance, and significantly improves limits on the relative strength of imaginary scalar couplings in the weak interaction. The value obtained for the correlation coefficient $N$, $0.067 \pm 0.011 \pm 0.004}, associated with $\sigma_{T1} , agrees with the Standard Model expectation, providing an important sensitivity test of the experimental setup.
Current status:
Reports on this Submission
Report #1 by Anonymous (Referee 1) on 2021-4-21 (Invited Report)
- Cite as: Anonymous, Report on arXiv:scipost_202103_00021v1, delivered 2021-04-21, doi: 10.21468/SciPost.Report.2815
Strengths
The paper reviews an experiment measuring for the first time two beta decay correlation coefficients , N and R, connected to the transverse polarisation of the emitted electron. It is clearly written and nicely combines the past experiment and future prospects of a similar experiment BRAND.
Weaknesses
The review is a combination of three existing articles and provides no new insights, apart from updating the literature where appropriate.
Report
The review is part of a series of reviews reporting on particle physics experiments which have been performed at PSI. For this series it is very favorable also including this unique experiment, however, the present manuscript can not be excepted due to self-plagiarism. Only a few passage are new, the dominant part of the review is a combination of three articles:
Kozela et al., PRL102,172301(2009)
Kozela et al., PRC85,045501 (2012)
Bodek et al., EPJ Web Conf 219, 04001 (2019)
For a publication the majority of the paper has to be reformulated, otherwise copyright issues might arise.
This is also true for all images, which currently are not correctly referenced.
As the paper is a combination of previously reviewed original research paper, no revision is required.
However, some passaged highlighted in yellow would profit from an additional sentence for clarification.
Requested changes
Reformulation of currently unaltered extract of previous papers.
The passages which are copied are highlighted in different colors as function of there origin, in the attached document.