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Structure Solution of the Fluorescent Protein Cerulean Using MeshAndCollect

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Published on: March 19, 2019

Colorful Mirror Solution to the Strong CP Problem.

Quentin Bonnefoy¹, Lawrence Hall¹, Claudio Andrea Manzari¹

¹Berkeley Center for Theoretical Physics, Department of Physics, University of California, Berkeley, California 94720, USA and Theoretical Physics Group, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.

Physical Review Letters

|December 15, 2023

Summary

This summary is machine-generated.

We propose a mirror world solution to the strong CP problem. This theory introduces new mass scales and heavy colored particles potentially discoverable at colliders.

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Area of Science:

Particle Physics
Cosmology
Quantum Field Theory

Background:

The strong CP problem, a long-standing puzzle in particle physics, concerns the unexplained smallness of a CP-violating term in the quantum chromodynamics (QCD) sector.
The Standard Model of particle physics, while successful, does not inherently solve the strong CP problem.

Purpose of the Study:

To propose and analyze a theoretical framework, a complete mirror world with parity symmetry, to resolve the strong CP problem.
To derive constraints on the new mass scales introduced by the mirror world scenario.

Main Methods:

Theoretical modeling of a mirror world with parity symmetry.
Analysis of spontaneous symmetry breaking mechanisms for electroweak and color groups.
Calculation of contributions to the QCD theta term.

Main Results:

The proposed mirror world with parity symmetry effectively solves the strong CP problem.
Bounds are derived for two new mass scales: v' (parity and mirror electroweak symmetry breaking) and v3 (color group breaking).
The strong CP problem is solved even when v3 is significantly smaller than v', allowing for accessible heavy colored states at colliders.

Conclusions:

The mirror world scenario provides a viable solution to the strong CP problem.
The breaking of parity symmetry introduces negligible contributions to the QCD theta term at three-loop order.
Dynamical symmetry breaking at v3 is possible without introducing an additional hierarchy problem.