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Title: Breaking mirror twin hypercharge

Journal Article · · Journal of High Energy Physics (Online)
 [1]; ORCiD logo [2]
  1. Univ. of Pittsburgh, PA (United States). Dept. of Physics and Astronomy. Pittsburgh Particle Physics, Astrophysics, and Cosmology Center
  2. Univ. of California, Davis, CA (United States). Center for Quantum Mathematics and Physics (QMAP)

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 Z2 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 Z2 symmetry and a scalar field that spontaneously breaks both twin hypercharge and Z2. Due to the Z2 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.

Research Organization:
Univ. of Pittsburgh, PA (United States); Univ. of California, Davis, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
SC0007914; SC0009999
OSTI ID:
1801794
Journal Information:
Journal of High Energy Physics (Online), Vol. 2019, Issue 12; ISSN 1029-8479
Publisher:
Springer BerlinCopyright Statement
Country of Publication:
United States
Language:
English

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