# Bridges of Low Energy observables with Leptogenesis in mu-tau Reflection Symmetry - High Energy Physics - Phenomenology

Bridges of Low Energy observables with Leptogenesis in mu-tau Reflection Symmetry - High Energy Physics - Phenomenology - Download this document for free, or read online. Document in PDF available to download.

Abstract: We consider an exact mu-tau reflection symmetry in neutrino sectorrealized atthe GUT scale in the context of the seesaw model with and withoutsupersymmetry. Assuming the two lighter heavy Majorana neutrinos are degenerateat the GUT scale, it is shown that the renormalization group RG evolutionfrom the GUT scale to the seesaw scale gives rise to breaking of the mu-tausymmetry and a tiny splitting between two degenerate heavy Majorana neutrinomasses as well as small variations of the CP phases in Y nu, which areessential to achieve a successful leptogenesis. Such small RG effects lead totiny deviations of theta {23} from the maximal value and the CP phasedelta {CP} from pi-2 imposed at the GUT scale due to mu-tau reflectionsymmetry. In our scenario, the required amount of the baryon asymmetry eta Bcan be generated via so-called resonant e-leptogenesis, in which the wash-outfactor concerned with electron flavor plays a crucial role in reproducing asuccessful leptogenesis. We show that CP violation responsible for thegeneration of baryon asymmetry of our universe can be directly linked with CPviolation measurable through neutrino oscillation as well as neutrino mixingangles theta {12} and theta {13}. We expect that, in addition to the reactorand long baseline neutrino experiments, the measurements for the supersymmetricparameter tan{beta} at future collider experiments would serve as an indirecttest of our scenario of baryogenesis based on the mu-tau reflection symmetry.

Author: ** Y. H. Ahn, Sin Kyu Kang, C. S. Kim, T. Phong Nguyen**

Source: https://arxiv.org/