PIRSA:23040070 Scientific Series Particle Physics

DOI10.48660/23040070

Series: Particle Physics

Tobioka, K. (2023). MeV Sterile Neutrinos in Light of the Cabibbo-Angle Anomaly. Perimeter Institute. https://pirsa.org/23040070

Tobioka, Kohsaku. MeV Sterile Neutrinos in Light of the Cabibbo-Angle Anomaly. Perimeter Institute, Apr. 25, 2023, https://pirsa.org/23040070 

@misc{ pirsa_PIRSA:23040070,
  doi = {10.48660/23040070},
  url = {https://pirsa.org/23040070},
  author = {Tobioka, Kohsaku},
  keywords = {Particle Physics},
  language = {en},
  title = {MeV Sterile Neutrinos in Light of the Cabibbo-Angle Anomaly},
  publisher = {Perimeter Institute},
  year = {2023},
  month = {apr},
  note = {PIRSA:23040070 see, \url{https://pirsa.org}}
}

Abstract

The mixing angles of the quark sectors are constrained by unitarity in the standard model. However, recent data indicates a about 3 sigma deviation from unitarity in the mixing angle between the 1st and 2nd generation down-type quarks, known as the Cabibbo angle anomaly. The observations include the charged-current weak decays of neutrons, nuclei, kaons, and the hadronic decay of tau leptons. Although the issue appears to lie in the quark sector, modifying the neutrino sector may offer a solution. In this talk, we discuss recent findings that suggest a sterile neutrino of MeV mass mixing with the electron-type neutrino can resolve the Cabibbo angle anomaly. We also examine the current bounds and future prospects of this scenario.

Zoom Link:  https://pitp.zoom.us/j/98083942792?pwd=eHFRUmJUVGNJcVpTSHZXVXFKQm95QT09

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