Neutrino masses and leptogenesis in type I and type II seesaw models

被引：16

作者：

Borah, Debasish ^{[1
]}

Das, Mrinal Kumar ^{[1
]}

机构：

[1] Tezpur Univ, Dept Phys, Tezpur 784028, India

来源：

PHYSICAL REVIEW D | 2014年 / 90卷 / 01期

关键词：

MAJORANA NEUTRINOS; LEPTON NUMBER; BARYOGENESIS; TRIPLET; VIOLATION; SYMMETRY; MIXINGS;

D O I：

10.1103/PhysRevD.90.015006

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The baryon to photon ratio in the present Universe is very accurately measured to be (6.065 +/- 0.090) x 10(-10). We study the possible origin of this baryon asymmetry in the neutrino sector through the generic mechanism of baryogenesis through leptogenesis. We consider both the type I and type II seesaw origin of neutrino masses within the framework of left-right symmetric models (LRSM). Using the latest best-fit global neutrino oscillation data of mass squared differences, mixing angles and Dirac CP phase, we compute the predictions for baryon to photon ratio keeping the Majorana CP phases as free parameters for two different choices of lightest neutrino mass eigenvalue for both normal and inverted hierarchical patterns of neutrino masses. We do our calculation with and without lepton flavor effects being taken into account. We choose different diagonal Dirac neutrino mass matrix for different flavor effects in such a way that the lightest right-handed neutrino mass is in the appropriate range. We also study the predictions for baryon asymmetry when the neutrino masses arise from a combination of both type I and type II seesaw (with dominating type I term) and discriminate between several combinations of Dirac and Majorana CP phases by demanding successful predictions for baryon asymmetry.

引用

页数：14

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