2020/10/26 by Jiabao Zhang, Tianhong Wang, Geng Li +3
Physics and Astronomy · #Branching fraction #CP violation #Dark Matter and Cosmic Phenomena #Degenerate energy levels #Lepton #Meson #Mixing (physics) #Neutrino #Neutrino Physics Research #Neutrino oscillation #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum mechanics #Sterile neutrino #hep-ph
paper · pdf · doi:10.1103/physrevd.103.035015
published as Phys. Rev. D 103, 035015 (2021) · 14 pages, 10 figures
arxiv created 2020/10/26 · openalex publication_date 2021/02/18 · arxiv updated 2021/02/24 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
In this work, we study the lepton-number-violating processes of K^\ifmmode±\else\textpm\fi and D^\ifmmode±\else\textpm\fi mesons. Two quasidegenerate sterile neutrinos are assumed to induce such processes. Different from the case where only one sterile neutrino is involved, here, the CP phases of the mixing parameters could give a sizable contribution. This, in turn, would affect the absolute values of the mixing parameters determined by the experimental upper limits of the branching fractions. A general function which expresses the difference between the mixing parameters for two-generation and one-generation cases is presented. Special cases with specific relations of the parameters are discussed. Besides, we also thoroughly investigate the CP violation effect of such processes. It is shown that generally ACP is a function of the sterile neutrino mass.