Visible neutrino decay in the light of appearance and disappearance long-baseline experiments
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Data
2017
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Resumo
We investigate the present constraints from MINOS and T2K experiments for
the neutrino decay scenario induced by non-diagonal couplings of Majorons to neutrinos.
As novelty, on top of the typical invisible decay prescription, we add the contribution of
visible decay, where final products can be observed. This new effect depends on the nature
of the neutrino-Majoron coupling, which can be of scalar or pseudoscalar type. Using the
combination of disappearance data from MINOS and disappearance and appearance data
from T2K, for normal ordering, we constrain the decay parameter α ≡ E Γ for the heaviest
neutrino, where E and Γ are the neutrino energy and width, respectively. We find that
when considering visible decay within appearance data, one can improve current neutrino
long-baseline constraints up to α < O(10−5
) eV2
, at 90% C.L., for both kinds of couplings,
which is better by one order of magnitude compared to previous bounds.
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Beyond standard model, Neutrino physics
Citação
GAGO, Alberto M.; GOMES, Ricardo A.; GOMES, Abner L.G.; JONES-PEREZ, Joel; PERES, Orlando L.G. Visible neutrino decay in the light of appearance and disappearance long-baseline experiments. Journal of High Energy Physics, Berlim, v. 2017, e022, 2017. Disponível em: https://link.springer.com/article/10.1007/JHEP11(2017)022. Acesso em: 16 maio 2023.