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Journal article
High quality Nelson-Barr solution to the strong CP problem with θ = π
The journal of high energy physics, Vol.2021(2), 118
15/Feb/2021
Abstract
We discuss composite UV completions of the Nelson-Barr(NB) solution to the strong CP problem. In our construction, the CP symmetry is broken spontaneously by the dynamics of a hidden QCD at θ = π. We focus on the minimal implementation of the NB construction, where the visible sector contains one extra pair of vector-like up/down quarks. We show that the minimal NB theory suffers from a quality problem and discuss how composite UV completions may resolve it. We present a simple calculable scheme, free of a quality problem, where dynamical CP violation in the hidden sector is mediated through a scalar portal to the visible sector, which successfully realizes the NB construction.
Details
- Title
- High quality Nelson-Barr solution to the strong CP problem with θ = π
- Creators
- Gilad Perez - 972WIS_INST___88Aviv Shalit (Corresponding Author) - 972WIS_INST___88
- Resource Type
- Journal article
- Publication Details
- The journal of high energy physics, Vol.2021(2), 118; 15/Feb/2021
- Language
- English
- DOI
- https://doi.org/10.1007/JHEP02(2021)118
- Grant note
- We are grateful to Diego Redigolo for many discussions and being our collaborator on this project till its last stage of preparations. We thank Zohar Komargodski for collaboration at the early stages of this paper and feedback. We also thank Michael Dine, Ryosuke Sato for fruitful discussions. The work of GP is supported by grants from The U.S.-Israel Binational Science Foundation (BSF), Israel Science Foundation (ISF), Friedrich Wilhelm Bessel research award, Minerva, Yeda-Sela-SABRA-WRC, and the Segre Research Award.
- Record Identifier
- 993269886503596
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