Accidental Peccei-Quinn symmetry from discrete flavour symmetry and Pati-Salam

被引：34

作者：

Bjorkeroth, Fredrik ^{[1
]}

Chun, Eung Jin ^{[2
]}

King, Stephen F. ^{[3
]}

机构：

[1] INFN Lab Nazl Frascati, Via E Fermi 40, I-00044 Frascati, Italy

[2] Korea Inst Adv Study, Seoul 02455, South Korea

[3] Univ Southampton, Sch Phys & Astron, Southampton SO17 1BJ, Hants, England

来源：

PHYSICS LETTERS B | 2018年 / 777卷

基金：

欧盟地平线“2020”;

关键词：

STRONG-CP PROBLEM; FAMILY SYMMETRY; AXION; MODEL; INVARIANCE;

D O I：

10.1016/j.physletb.2017.12.058

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We show how an accidental U(1) Peccei-Quinn (PQ) symmetry can arise from a discrete A(4) family symmetry combined with a discrete flavour symmetry Z(3) x Z(5)(2), in a realistic Pati-Salam unified theory of flavour. Imposing only these discrete flavour symmetries, the axion solution to the strong CP problem is protected from PQ-breaking operators to the required degree. A QCD axion arises from a linear combination of A(4) triplet flavons, which are also responsible for fermion flavour structures due to their vacuum alignments. We find that the requirement of an accidental PQ symmetry arising from a discrete flavour symmetry constrains the form of the Yukawa matrices, providing a link between flavour and the strong CP problem. Our model predicts specific flavour-violating couplings of the flavourful axion and thus puts a strong limit on the axion scale from kaon decays. (c) 2017 The Authors. Published by Elsevier B.V.

引用

页码：428 / 434

页数：7

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