Breaking Mirror Twin Hypercharge

Abstract

The Twin Higgs scenario stabilizes the Higgs mass through an approximate global symmetry and has remained natural in the face of increasingly stringent LHC bounds on colored top partners. Two basic structural questions in this framework concern the nature of the twin hypercharge gauge symmetry and the origin of the ${\mathbb{Z}}_2$ symmetry breaking needed to achieve the correct vacuum alignment. Both questions are addressed in a simple extension of the Mirror Twin Higgs model with an exact ${\mathbb{Z}}_2$ symmetry and a scalar field that spontaneously breaks both twin hypercharge and ${\mathbb{Z}}_2$. Due to the ${\mathbb{Z}}_2$ symmetry and an approximate $U(2)$ symmetry in the potential, a new hypercharge scalar appears in the visible sector and, like the Higgs, is a pseudo-Nambu-Goldstone boson with a weak-scale mass. Couplings between the hypercharge scalar and matter provide a new dynamical source of twin sector fermion masses. Depending on the nature and size of these couplings, a variety of experimental signatures may arise, including quark and lepton flavor violation, neutrino masses and mixings as well as direct collider probes of the hypercharged scalar. These signals are correlated with the twin matter spectrum, which can differ dramatically from the visible one, including dynamical realizations of fraternal-like scenarios.

34 pages, 3 figures; Updated to published version

References in corpus (11)

• Twin SUSY
• Neutral Naturalness from the Orbifold Higgs
• Collider Searches for Long-Lived Particles Beyond the Standard Model
• A Holographic Twin Higgs Model
• Minimal Mirror Twin Higgs
• SUSY Meets Her Twin
• The Dark Top
• Phase Transitions in Twin Higgs Models
• Minimal Non-Abelian Supersymmetric Twin Higgs
• Singleton Portals to the Twin Sector
• Twin Turtles

Cited by in corpus (14)

• The Science of the Einstein Telescope
• Gravitational Waves from Domain Walls in Pulsar Timing Array Datasets
• Freeze-Twin Dark Matter
• Direct Detection of Mirror Matter in Twin Higgs Models
• A Predictive Mirror Twin Higgs with Small ${\mathbf{Z}}_2$ Breaking
• Twin Higgs Portal Dark Matter
• Direct Detection of Atomic Dark Matter in White Dwarfs
• Resurrecting the Fraternal Twin WIMP Miracle
• Twin Cogenesis
• Twin Quark Dark Matter From Cogenesis
• Gegenbauer's Twin
• Breaking Mirror Twin Color
• Review of Neutral Naturalness
• The Lepton Flavor Changing Decays and One-loop Muon Anomalous Magnetic Moment in the Extended Mirror Twin Higgs Models