Regular Article - Theoretical Physics
Constraining visible neutrino decay at KamLAND and JUNO
Instituto de Física Gleb Wataghin-UNICAMP, 13083-859, Campinas, São Paulo, Brazil
2 Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117, Heidelberg, Germany
3 Departmento de Física, Pontifícia Universidade Católica do Rio de Janeiro, C.P. 38071, 22452-970, Rio de Janeiro, Brazil
4 Department of Physics, Center for Neutrino Physics, Virginia Tech, 24061, Blacksburg, VA, USA
Accepted: 19 October 2020
Published online: 29 October 2020
We study visible neutrino decay at the reactor neutrino experiments KamLAND and, JUNO. Assuming the Majoron model of neutrino decay, we obtain constraints on the couplings between Majoron and neutrino as well as on the lifetime/mass of the most massive neutrino state i.e., or , respectively, for the normal or the inverted mass orderings. We obtain the constraints on the lifetime in the inverted mass ordering for both KamLAND and JUNO at 90% CL. In the normal ordering in which the bound can be obtained for JUNO only, the constraint is milder than the inverted ordering case, s/eV at 90% CL. We find that the dependence of lightest neutrino mass (), for the normal (inverted) mass ordering, on the constraints for the different types of couplings (scalar or pseudo-scalar) is rather strong, but the dependence on the lifetime/mass bound is only modest.
© The Author(s) 2020
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