Threshold effects in SO(10) models with one intermediate breaking scale

被引：15

作者：

Meloni, Davide ^{[1
]}

Ohlsson, Tommy ^{[2
,3
,4
]}

Pernow, Marcus ^{[2
,3
]}

机构：

[1] Univ Roma Tre, Dipartimento Matemat & Fis, Via Vasca Navale 84, I-00146 Rome, Italy

[2] AlbaNova Univ Ctr, KTH Royal Inst Technol, Sch Engn Sci, Dept Phys, Roslagstullsbacken 21, S-10691 Stockholm, Sweden

[3] AlbaNova Univ Ctr, Oskar Klein Ctr, Roslagstullsbacken 21, S-10691 Stockholm, Sweden

[4] Univ Iceland, Sci Inst, Dunhaga 3, IS-107 Reykjavik, Iceland

来源：

EUROPEAN PHYSICAL JOURNAL C | 2020年 / 80卷 / 09期

基金：

瑞典研究理事会;

关键词：

GRAND-UNIFIED THEORIES; RENORMALIZATION-GROUP EQUATIONS; LEFT-RIGHT-SYMMETRY; NEUTRINO MASSES; PROTON LIFETIME; COUPLING-CONSTANTS; MAGNETIC MONOPOLES; PARITY-BREAKING; CP CONSERVATION; GAUGE-THEORIES;

D O I：

10.1140/epjc/s10052-020-8308-9

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：

Despite the successes of the Standard Model of particle physics, it is known to suffer from a number of deficiencies. Several of these can be addressed within non-supersymmetric theories of grand unification based on SO(10). However, achieving gauge coupling unification in such theories is known to require additional physics below the unification scale, such as symmetry breaking in multiple steps. Many such models are disfavored due to bounds on the proton lifetime. Corrections arising from threshold effects can, however, modify these conclusions. We analyze all seven relevant breaking chains with one intermediate symmetry breaking scale, assuming the "survival hypothesis" for the scalar masses. Two are allowed by proton lifetime and two are disfavored by a failure to unify the gauge couplings. The remaining three unify at a too low scale, but can be salvaged by various amounts of threshold corrections. We parametrize this and thereby rank the models by the size of the threshold corrections required to save them.

引用

页数：18

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