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Competitive constraints on exotic tensor currents from EC/β+ ratios

  • Victor Dumenil
  • Leendert Hayen
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Abstract

We introduce the ratio of electron capture to positron decay rates of unstable nuclei as a probe for exotic tensor currents in the electroweak sector. We calculate nuclear structure corrections and newly derived radiative corrections and obtain competitive limits on exotic tensor couplings using historically available data to find εT = (1.06 ± 0.76)× 10−3 which is competitive with collider searches and the global β-decay database. In doing so, we resolve a 50-year-old tension in the strongly hindered 22Na transition by retaining higher-order operators, obtaining a consistent description of its different weak-decay observables. Finally, we discuss the potential of this method to significantly improve tensor constraints using modern cryogenic quantum sensors.

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Cite

BibTeXRIS
BibTeX
@misc{dumenil2026competitive,
  title = {{Competitive constraints on exotic tensor currents from $EC/β^+$ ratios}},
  author = {Victor Dumenil and Leendert Hayen},
  howpublished = {HAL},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.14312},
  eprint = {2610.14312},
  archivePrefix = {arXiv},
  url = {https://hal.science/hal-05829977v1},
}
RIS
TY  - UNPB
TI  - Competitive constraints on exotic tensor currents from EC/β^+ ratios
AU  - Victor Dumenil
AU  - Leendert Hayen
PY  - 2026
DA  - 2026/10/09
PB  - HAL
DO  - 10.48550/arxiv.2610.14312
UR  - https://hal.science/hal-05829977v1
AB  - We introduce the ratio of electron capture to positron decay rates of unstable nuclei as a probe for exotic tensor currents in the electroweak sector. We calculate nuclear structure corrections and newly derived radiative corrections and obtain competitive limits on exotic tensor couplings using historically available data to find ε_T = (1.06 ± 0.76)× 10^−3 which is competitive with collider searches and the global β-decay database. In doing so, we resolve a 50-year-old tension in the strongly hindered ^22Na transition by retaining higher-order operators, obtaining a consistent description of its different weak-decay observables. Finally, we discuss the potential of this method to significantly improve tensor constraints using modern cryogenic quantum sensors.
ER  -