2019/04/30 by Brian Batell, Christopher B. Verhaaren · 1 citation
Computer Science · Physics and Astronomy · #Computational Physics and Python Applications #Fermion #Gauge boson #Higgs boson #Higgs field #Higgs sector #Hypercharge #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #Quark #Scalar (mathematics) #Spontaneous symmetry breaking #Symmetry breaking #hep-ph
paper · pdf · doi:10.1007/jhep12(2019)010
published as JHEP 1912 (2019) 010 · 34 pages, 3 figures; Updated to published version
openalex created_date 2019/05/03 · openalex publication_date 2019/12/01 · arxiv created 2019/12/07 · arxiv updated 2019/12/10 · openalex updated_date 2026/08/06
A bstract 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 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 ℤ 2 symmetry and a scalar field that spontaneously breaks both twin hypercharge and ℤ 2 . Due to the 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.