Neutrino phenomenology from leptogenesis

• Published in: The European physical journal. C, Particles and fields Vol. 78; no. 10; pp. 1 - 9
• Main Authors: Buccella, Franco, Fiorillo, Damiano F. G., Miele, Gennaro, Morisi, Stefano, Pisanti, Ofelia, Santorelli, Pietro
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01-10-2018; Springer; Springer Nature B.V; SpringerOpen
• Subjects: Astronomy; Astrophysics and Cosmology; Cosmology; CP violation; Elementary Particles; Hadrons; Heavy Ions; Mass matrix; Measurement Science and Instrumentation; Neutrinos; Nuclear Energy; Nuclear Physics; Parameters; Phenomenology; Physics; Physics and Astronomy; Quantum Field Theories; Quantum Field Theory; Quarks; Regular Article - Theoretical Physics; String Theory; Structural hierarchy
• ISSN: 1434-6044; 1434-6052
• DOI: 10.1140/epjc/s10052-018-6299-6

Assuming a type-I seesaw mechanism for neutrino mass generation and invoking a baryogenesis
via
leptogenesis scenario, we consider a reasonable hierarchical structure for Dirac neutrino mass matrix, similar to up-type quark mass matrix. These hypotheses imply a relevant connection between high scale CP violation and low energy one. By requiring a compact heavy neutrino mass spectrum, which allows to circumvent Davidson–Ibarra limit, one can obtain an efficient leptogenesis restricting the allowed region for low energy neutrino parameters. Once the oscillating parameters are taken inside a
3
σ
range, through the numerical resolution of the leptogenesis Boltzmann equations one gets the following allowed intervals for the lightest neutrino mass and the Dirac CP phase:
-
0.90
π
<
δ
<
-
0.75
π
and
m
1
∼
(
0.002
-
0.004
)
 eV.