Naturally light Dirac and pseudo-Dirac neutrinos from left-right symmetry

被引：18

作者：

Babu, K. S. ^{[1
]}

He, Xiao-Gang ^{[2
,3
,4
,5
]}

Su, Mingxian ^{[1
]}

Thapa, Anil ^{[6
]}

机构：

[1] Oklahoma State Univ, Dept Phys, Stillwater, OK 74078 USA

[2] Shanghai Jiao Tong Univ, Tsung Dao Lee Inst, Shanghai 200240, Peoples R China

[3] Shanghai Jiao Tong Univ, Sch Phys & Astron, Shanghai 200240, Peoples R China

[4] Natl Taiwan Univ, Natl Ctr Theoret Sci, Taipei 10617, Taiwan

[5] Natl Taiwan Univ, Dept Phys, Taipei 10617, Taiwan

[6] Univ Virginia, Dept Phys, Charlottesville, VA 22904 USA

来源：

JOURNAL OF HIGH ENERGY PHYSICS | 2022年 / 2022卷 / 08期

基金：

美国国家科学基金会;

关键词：

Left-Right Models; Neutrino Mixing; Vector-Like Fermions; DOUBLE-BETA DECAY; STERILE NEUTRINOS; LEPTON-NUMBER; MASS; VIOLATION; MODEL;

D O I：

10.1007/JHEP08(2022)140

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

We develop a class of left-right symmetric theories based on the gauge group SU(3)(c) x SU(2)(L) x SU(2)(R) x U(1) with a generalized seesaw mechanism for generating the charged fermion masses. Neutrinos are naturally Dirac particles in this setup with their small masses arising from two-loop quantum corrections. We evaluate these two-loop diagrams exactly and analyze the flavor structure of the lepton sector. We find excellent fits to neutrino oscillation data, independent of the right-handed gauge symmetry breaking scale. We also explore the possibility that neutrinos are pseudo-Dirac particles in this framework, with the tiny mass splittings between active and sterile neutrinos arising from Planck-induced corrections and find possible realizations. These models can be tested in the near future with precision cosmological measurements of Delta N-eff in CMB which is predicted to be similar or equal to 0.14. This class of models allows for a solution to the strong CP problem via parity symmetry without the need for an axion.

引用

页数：24

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