skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: A Flavorful Factoring of the Strong CP Problem

Abstract

Motivated by the intimate connection between the strong CP problem and the flavor structure of the Standard Model, we present a flavor model that revives and extends the classic $${m_u=0}$$ solution to the strong CP problem. QCD is embedded into a $$SU(3)_1\times SU(3)_2 \times SU(3)_3$$ gauge group, with each generation of quarks charged under the respective $SU(3)$. The non-zero value of the up-quark Yukawa coupling (along with the strange quark and bottom-quark Yukawas) is generated by contributions from small instantons at a new scale $$M \gg \Lambda_{QCD}$$. The Higgsing of $$SU(3)^3\to SU(3)_c$$ allows dimension-5 operators that generate the Standard Model flavor structure and can be completed in a simple renormalizable theory. The smallness of the third generation mixing angles can naturally emerge in this picture, and is connected to the smallness of threshold corrections to $$\bar\theta$$. Remarkably, $$\bar\theta$$ is essentially fixed by the measured quark masses and mixings, and is estimated to be close to the current experimental bound and well within reach of the next generation of neutron and proton EDM experiments.

Authors:
 [1];  [2]
  1. Harvard U., Phys. Dept.
  2. Fermilab
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1431576
Report Number(s):
FERMILAB-PUB-17-562-PPD; arXiv:1712.05803
1643847
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Journal Article
Resource Relation:
Journal Name: TBD
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Agrawal, Prateek, and Howe, Kiel. A Flavorful Factoring of the Strong CP Problem. United States: N. p., 2017. Web.
Agrawal, Prateek, & Howe, Kiel. A Flavorful Factoring of the Strong CP Problem. United States.
Agrawal, Prateek, and Howe, Kiel. Fri . "A Flavorful Factoring of the Strong CP Problem". United States. doi:. https://www.osti.gov/servlets/purl/1431576.
@article{osti_1431576,
title = {A Flavorful Factoring of the Strong CP Problem},
author = {Agrawal, Prateek and Howe, Kiel},
abstractNote = {Motivated by the intimate connection between the strong CP problem and the flavor structure of the Standard Model, we present a flavor model that revives and extends the classic ${m_u=0}$ solution to the strong CP problem. QCD is embedded into a $SU(3)_1\times SU(3)_2 \times SU(3)_3$ gauge group, with each generation of quarks charged under the respective $SU(3)$. The non-zero value of the up-quark Yukawa coupling (along with the strange quark and bottom-quark Yukawas) is generated by contributions from small instantons at a new scale $M \gg \Lambda_{QCD}$. The Higgsing of $SU(3)^3\to SU(3)_c$ allows dimension-5 operators that generate the Standard Model flavor structure and can be completed in a simple renormalizable theory. The smallness of the third generation mixing angles can naturally emerge in this picture, and is connected to the smallness of threshold corrections to $\bar\theta$. Remarkably, $\bar\theta$ is essentially fixed by the measured quark masses and mixings, and is estimated to be close to the current experimental bound and well within reach of the next generation of neutron and proton EDM experiments.},
doi = {},
journal = {TBD},
number = ,
volume = ,
place = {United States},
year = {Fri Dec 15 00:00:00 EST 2017},
month = {Fri Dec 15 00:00:00 EST 2017}
}