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Title: Electroweak-like baryogenesis with new chiral matter

Journal Article · · Journal of High Energy Physics (Online)
 [1];  [2];  [3]; ORCiD logo [4]
  1. Tokyo Institute of Technology (Japan). Dept. of Physics
  2. Institute for Advanced Study, Princeton, NJ (United States). School of Natural Sciences
  3. Shanghai Jiao Tong Univ. (China). Tsung-Dao Lee Institute. School of Physics and Astronomy
  4. Rutgers Univ., Piscataway, NJ (United States). Dept. of Physics and Astronomy

We propose a framework where a phase transition associated with a gauge symmetry breaking that occurs (not far) above the electroweak scale sets a stage for baryogenesis similar to the electroweak baryogenesis in the Standard Model. A concrete realization utilizes the breaking of SU(2)R × U(1)X → U(1)Y. New chiral fermions charged under the extended gauge symmetry have nonzero lepton numbers, which makes the B - L symmetry anomalous. The new lepton sector contains a large flavor-dependent CP violation, similar to the Cabibbo-Kobayashi-Maskawa phase, without inducing sizable electric dipole moments of the Standard Model particles. A bubble wall dynamics associated with the first-order phase transition and SU(2)R sphaleron processes generate a lepton asymmetry, which is transferred into a baryon asymmetry via the ordinary electroweak sphaleron process. Unlike the Standard Model electroweak baryogenesis, the new phase transition can be of the strong first order and the new CP violation is not significantly suppressed by Yukawa couplings, so that the observed asymmetry can be produced. The model can be probed by collider searches for new particles and the observation of gravitational waves. One of the new leptons becomes a dark matter candidate. The model can be also embedded into a left-right symmetric theory to solve the strong CP problem.

Research Organization:
Rutgers Univ., Piscataway, NJ (United States)
Sponsoring Organization:
USDOE Office of Science (SC); Japan Society for the Promotion of Science (JSPS); Friends of the Institute for Advanced Study
Grant/Contract Number:
SC0010008; 20J12415
OSTI ID:
1851273
Journal Information:
Journal of High Energy Physics (Online), Vol. 2021, Issue 7; ISSN 1029-8479
Publisher:
Springer NatureCopyright Statement
Country of Publication:
United States
Language:
English

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