Precise measurements of the decay of free neutrons

Dirk Dubbers, Bastian Märkisch

Research output: Contribution to journalReview articlepeer-review

18 Scopus citations


The impact of new and highly precise neutron β decay data is reviewed. We focus on recent results from neutron lifetime, β asymmetry, and electron–neutrino correlation experiments. From these results, weak interaction parameters are extracted with unprecedented precision, which is possible also because of progress in effective field theory and lattice QCD. Limits on New Physics beyond the Standard Model derived from neutron decay data are sharper than those derived from high-energy experiments, except for processes involving right-handed neutrinos.

Original languageEnglish
Pages (from-to)139-163
Number of pages25
JournalAnnual Review of Nuclear and Particle Science
StatePublished - 2021


  • Beyond the Standard Model
  • CKM unitarity
  • Cold neutrons
  • Effective field theory
  • Ultracold neutrons
  • Weak interaction
  • β decay


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