Data-driven reevaluation of $ft$-values in superallowed $β$ decays
Fuente:
arXiv
Saved in:
| Main Authors: | , |
|---|---|
| Format: | Preprint |
| Published: |
2023
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866916199876526080 |
|---|---|
| author | Seng, Chien-Yeah Gorchtein, Mikhail |
| author_facet | Seng, Chien-Yeah Gorchtein, Mikhail |
| contents | We present a comprehensive re-evaluation of the $ft$ values in superallowed nuclear $β$ decays crucial for the precise determination of $V_{ud}$ and low-energy tests of the electroweak Standard Model. It consists of the first, fully data-driven analysis of the nuclear $β$ decay form factor, that utilizes isospin relations to connect the nuclear charged weak distribution to the measurable charge distributions. This prescription supersedes previous shell-model estimations, and allows for a rigorous quantification of theory uncertainties in $f$ which is absent in the existing literature. Our new evaluation shows an overall downward shift of the central values of $f$ at the level of 0.01\%. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2309_16893 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Data-driven reevaluation of $ft$-values in superallowed $β$ decays Seng, Chien-Yeah Gorchtein, Mikhail Nuclear Theory High Energy Physics - Experiment High Energy Physics - Phenomenology Nuclear Experiment We present a comprehensive re-evaluation of the $ft$ values in superallowed nuclear $β$ decays crucial for the precise determination of $V_{ud}$ and low-energy tests of the electroweak Standard Model. It consists of the first, fully data-driven analysis of the nuclear $β$ decay form factor, that utilizes isospin relations to connect the nuclear charged weak distribution to the measurable charge distributions. This prescription supersedes previous shell-model estimations, and allows for a rigorous quantification of theory uncertainties in $f$ which is absent in the existing literature. Our new evaluation shows an overall downward shift of the central values of $f$ at the level of 0.01\%. |
| title | Data-driven reevaluation of $ft$-values in superallowed $β$ decays |
| topic | Nuclear Theory High Energy Physics - Experiment High Energy Physics - Phenomenology Nuclear Experiment |
| url | https://arxiv.org/abs/2309.16893 |