6533b82ffe1ef96bd1295c76
RESEARCH PRODUCT
Analysis of light neutrino exchange and short-range mechanisms in 0νββ decay
Lukas GrafJenni KotilaJenni KotilaFrank F. DeppischFrancesco Iachellosubject
PhysicsParticle physicsSterile neutrino010308 nuclear & particles physicsPhysics beyond the Standard ModelHigh Energy Physics::PhenomenologySupersymmetry7. Clean energy01 natural sciencesLepton numberMAJORANADouble beta decay0103 physical sciencesNeutrinoInteracting boson model010306 general physicsdescription
Neutrinoless double beta decay (0νββ) is a crucial test for lepton number violation. Observation of this process would have fundamental implications for neutrino physics, theories beyond the Standard Model and cosmology. Focusing on so-called short-range operators of 0νββ and their potential interplay with the standard light Majorana neutrino exchange, we present the first complete calculation of the relevant nuclear matrix elements, performed within the interacting boson model (IBM-2). Furthermore, we calculate the relevant phase space factors using exact Dirac electron wave functions, taking into account the finite nuclear size and screening by the electron cloud. The obtained numerical results are presented together with up-to-date limits on the standard mass mechanism and effective 0νββ short-range operators in the interacting boson model framework. Finally, we interpret the limits in the particle physics scenarios incorporating heavy sterile neutrinos, left-right symmetry and R-parity violating supersymmetry.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2020-11-16 | Physical Review |