Speaker
Description
Existence of non-interacting fermion singlets, known as sterile neutrinos, are contextualised in beyond standard model physics. From accommodating oscillation anomalies to play a role of messenger for neutrino mass generation mechanism through type-I seesaw, they have blossomed as a key ingredient with their several mass variants. In addition, being a standard model singlet, they are accessible to acquire majorana type mass and hence triggers lepton number violation (LNV) and charged lepton flavour violation (cLFV) processes. Driven by this fact, we are intended to work with incorporation of 3 sterile states $N_i, i=1,2,3$ with mass $M_i, i=1,2,3$ along with the standard model active neutrinos, thus presenting a 3+3 model for calculation of the effective mass $ |m_{ee}|$ of neutrino less double beta ($0\nu\beta\beta$) decay which comes as prior of interest in the context of LNV process. We have derived the analytical forms for the added sterile states using exact seesaw relation. In this context, the additional cp violating (CPV) phases and active-sterile mixing angle values are also explored. Following the experimental limit of $ | m_{ee}| $, we have obtained the involved sterile states in the KeV-MeV range. Interestingly, most of the KeV range sterile stated are found to follow the hierarchical pattern i.e., for NH ($M_1 > M_2 > M_3$) and for IH ($M_1 < M_2 < M_3$). We have also checked the reliability of our result by calculating the branching ratio of $\mu \rightarrow e \gamma$, a prominent cLFV process, in the 3+3 framework. Significant results on BR($\mu \rightarrow e \gamma$) are found for KeV range sterile neutrinos with their corresponding CPV phase and active-sterile mixing angle values.
| Session | Neutrino Physics |
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