On the minimal active-sterile neutrino mixing in seesaw type I mechanism with sterile neutrinos at GeV scale

Abstract

Renewed interest in GeV-scale sterile neutrinos capable of explaining active neutrino oscillations via see-saw type I mechanism has been expressed in several proposals of direct searches. Given this activity we estimate the minimal values of sterile-active mixing angles provided one, two, or three sterile neutrinos are lighter than D-meson.

Comments: 7 pages, 2 figures