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Area of Science:

  • Nuclear Physics
  • Particle Physics
  • Quantum Electrodynamics

Background:

  • First-forbidden nuclear beta decays are typically studied without considering electromagnetic radiative corrections.
  • Existing theoretical frameworks do not fully account for the impact of virtual or real photon exchange on nuclear matrix elements.

Purpose of the Study:

  • To investigate the O(α) structure-dependent electromagnetic radiative corrections to first-forbidden nuclear beta decays.
  • To explore how photon exchange influences nuclear matrix elements and decay characteristics.
  • To assess the implications for precision tests of the Standard Model and new physics searches.

Main Methods:

  • Theoretical calculation of electromagnetic radiative corrections at O(α) order.
  • Analysis of angular momentum insertion into nuclear matrix elements via photon exchange.
  • Examination of decay spectra at vanishing nuclear recoil momentum.

Main Results:

  • Electromagnetic corrections open up first-forbidden decays at zero nuclear recoil momentum, a process forbidden at tree level.
  • A dramatic alteration of the nuclear beta decay spectrum is observed, deviating from previous predictions.
  • The findings highlight a new mechanism influencing decay dynamics.

Conclusions:

  • The study reveals a significant, previously unconsidered effect of electromagnetic radiative corrections on specific nuclear beta decays.
  • This phenomenon necessitates a re-evaluation of existing theoretical models and experimental analyses.
  • The results offer new avenues for precision tests of the Standard Model and the search for physics beyond it.