Accurate Measurement of the Beta-Asymmetry in Neutron Decay Rules out Dark Decay Mode
| Autor: | Hartmut Abele, Dirk Dubbers, T. Soldner, Heiko Saul, Bastian Märkisch |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Physics
Particle physics 010308 nuclear & particles physics Cabibbo–Kobayashi–Maskawa matrix media_common.quotation_subject Dark matter Parity (physics) 01 natural sciences Asymmetry Surfaces Coatings and Films Elementary particle physics 0103 physical sciences Neutron 010306 general physics media_common |
| Zdroj: | Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques. 14:S140-S143 |
| ISSN: | 1819-7094 1027-4510 |
| Popis: | The question of the nature of dark matter is one of the major challenges of elementary particle physics. Not surprisingly, the recent suggestion of a dark decay channel as a solution to persisting discrepancies in neutron lifetime measurements has initiated substantial research activity. We discuss the accurate measurement of the parity violating β-asymmetry using Perkeo III. The result is about five times more precise than the current world average and resolves a long-standing discrepancy. Based on this, we largely rule out the dark decay mode interpretation. We derive a new world average of the weak axial coupling and obtain a competitive value of the first element of the quark mixing matrix Vud from neutron decay. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink