Visible neutrino decay in the light of appearance and disappearance long-baseline experiments

Author(s)

Gago, Alberto M. ; Gomes, Ricardo A. ; Gomes, Abner L. G. ; Jones-Perez, Joel ; Peres, Orlando L. G.

• Document type: Journal article
• Source: Journal of High Energy Physics; v. N/A, n. 11, p. 29-pg., 2017-11-07.

Abstract

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 para alpha E Gamma for the heaviest neutrino, where E and are the neutrino energy and width, respectively. We find that when considering visible decay within appearance data, alpha < O (10(-5))eV(2), at 90% C.L., for both kinds of couplings, which is better by one order of magnitude compared to previous bounds. (AU)

• FAPESP's process: 14/19164-6 - Challenges in the 21st century in neutrino physics and astrophysics
• Grantee: Orlando Luis Goulart Peres
• Support Opportunities: Special Projects