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Electroweak Baryogenesis from Dark-Sector CP Violation.

Marcela Carena^1,2,3, Mariano Quirós^4,5, Yue Zhang^1,6

¹Theoretical Physics Department, Fermilab, P.O. Box 500, Batavia, Illinois 60510, USA.

Physical Review Letters

|June 8, 2019

Summary

This summary is machine-generated.

This study introduces a new electroweak baryogenesis model where CP violation in a dark sector avoids electric dipole moment constraints. A novel gauge boson, Z_{μ}^{

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Area of Science:

Particle Physics
Cosmology
Baryogenesis

Background:

Electroweak baryogenesis models face constraints from electric dipole moments.
Standard Model gauge singlets offer a potential avenue for new physics.
The origin of the matter-antimatter asymmetry in the universe remains a key question.

Purpose of the Study:

To propose a novel mechanism for electroweak baryogenesis.
To explore CP violation within a dark sector to evade stringent experimental constraints.
To embed this mechanism within a consistent theoretical framework.

Main Methods:

Investigating CP violation in a dark sector composed of Standard Model gauge singlets.
Utilizing the background of a new gauge boson (Z_{μ}^{'}) to drive electroweak sphaleron processes.
Embedding the mechanism in ultraviolet completions with spontaneously broken gauged lepton number.

Main Results:

A novel baryogenesis mechanism is presented, evading electric dipole moment constraints.
The Z_{μ}^{'} gauge boson background is shown to generate the necessary baryon asymmetry.
The mechanism is shown to be embeddable in viable ultraviolet completions.

Conclusions:

The proposed dark sector CP violation mechanism offers a compelling solution to baryogenesis.
The models predict rich phenomenology testable at current and future colliders.
Experimental searches for Z^{'} bosons, dark matter, and new scalars can probe this framework.