Variety of SO(10) GUTs with natural doublet-triplet splitting via the missing partner mechanism

被引：36

作者：

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

Gogoladze, Ilia ^{[2
]}

Nath, Pran ^{[4
]}

Syed, Raza M. ^{[3
,4
]}

机构：

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

[2] Univ Delaware, Bartol Res Inst, Dept Phys & Astron, Newark, DE 19716 USA

[3] Amer Univ Sharjah, Dept Phys, Sharjah, U Arab Emirates

[4] Northeastern Univ, Dept Phys, Boston, MA 02115 USA

来源：

PHYSICAL REVIEW D | 2012年 / 85卷 / 07期

基金：

美国国家科学基金会;

关键词：

GRAND; COUPLINGS; SO(2N); MODEL;

D O I：

10.1103/PhysRevD.85.075002

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present a new class of unified SO(10) models where the grand unified theory symmetry breaking down to the standard model gauge group involves just one scale, in contrast to the conventional SO(10) models which require two scales. Further, the models we discuss possess a natural doublet-triplet splitting via the missing partner mechanism without fine-tuning. Such models involve 560 + (560) over bar pair of heavy Higgs fields along with a set of light fields. The 560 + (560) over bar are the simplest representations of SO(10) besides the 126 + (126) over bar which contain an excess of color triplets over SU(2)(L) doublets. We discuss several possibilities for realizing the missing partner mechanism within these schemes. With the 126 + (126) over bar multiplets, three viable models are found with additional fields belonging to {210 + 2 X 10 + 120}, {45 + 10 + 120}, or {210 + 16 + (16) over bar + 10 + 120}. With the 560 + (560) over bar, a unique possibility arises for the missing partner mechanism, with additional {2 X 10 + 320} fields. These models are developed in some detail. It is shown that fully realistic fermion masses can arise in some cases, while others can be made realistic by addition of vectorlike representations. Naturally large neutrino mixing angles, including sizable theta(13), can emerge in these models. The couplings of the H-u(H-d) Higgs doublets of the minimal supersymmetric standard model which give masses to the up quarks (down quarks and leptons) are not necessarily equal at the grand unification scale and would lead to a new phenomenology at the low-energy scales.

引用

页数：15

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