Analysis of light neutrino exchange and short-range mechanisms in 0νββ decay
Deppisch, F. F., Graf, L., Iachello, F., & Kotila, J. (2020). Analysis of light neutrino exchange and short-range mechanisms in 0νββ decay. Physical Review D, 102(9), Article 095016. https://doi.org/10.1103/physrevd.102.095016
Published inPhysical Review D
© 2020 the Authors
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. ...
PublisherAmerican Physical Society (APS)
Publication in research information system
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Related funder(s)Academy of Finland
Funding program(s)Research costs of Academy Research Fellow, AoF; Research post as Academy Research Fellow, AoF
Additional information about fundingThis work was supported in part by the U.S. Department of Energy (Grant No. DE-FG-02-91ER-40608) and the UK Royal Society International Exchange program. The work of J. K. was supported by the Academy of Finland (Grants No. 314733 and No. 320062). L. G. and F. F. D. acknowledge support from the UK Science and Technology Facilities Council (STFC) via a Consolidated Grant (Reference ST/P00072X/1).
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