Mu-tau reflection symmetry with a high scale texture-zero

Author(s)

Nishi, C. C. ; Sanchez-Vega, B. L. ; Souza Silva, G.

• Document type: Journal article
• Source: Journal of High Energy Physics; v. N/A, n. 9, p. 30-pg., 2018-09-07.

Abstract

The mu tau-reflection symmetric neutrino mass matrix can accommodate all known neutrino mixing angles, with maximal atmospheric angle fixed, and predicts all the unknown CP phases of the lepton sector but is unable to predict the absolute neutrino mass scale. Here we present a highly predictive scenario where mu tau-reflection is combined with a discrete abelian symmetry to enforce a texture-zero in the mass matrix of the heavy right-handed neutrinos that generate the light neutrino masses. Such a restriction reduces the free parameters of the low energy theory to zero and the absolute neutrino mass scale is restricted to few discrete regions, three in the few meV range and one extending up to around 30 meV. The heavy neutrino sector is dependent only on two free parameters which are further restricted to small regions from the requirement of successful leptogenesis. Mass degenerate heavy neutrinos are possible in one case but there is no resonant enhancement of the CP asymmetry. (AU)

• FAPESP's process: 18/07903-0 - FLASY 2018: 7th Workshop on Flavour Symmetries and Consequences in Accelerators and Cosmology
• Grantee: Celso Chikahiro Nishi
• Support Opportunities: Research Grants - Meeting - Abroad
• 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