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Title: Cosmological Constraints on Decoupled Dark Photons and Dark Higgs

Any neutral boson such as a dark photon or dark Higgs that is part of a non-standard sector of particles can mix with its standard model counterpart. When very weakly mixed with the Standard Model, these particles are produced in the early Universe via the freeze-in mechanism and subsequently decay back to standard model particles. In this work, we place constraints on such mediator decays by considering bounds from Big Bang nucleosynthesis and the cosmic microwave background radiation. We find both nucleosynthesis and CMB can constrain dark photons with a kinetic mixing parameter between log ϵ ~ -10 to -17 for masses between 1 MeV and 100 GeV. Similarly, the dark Higgs mixing angle ϵ with the Standard Model Higgs is constrained between log ϵ ~ -6 to -15. Dramatic improvement on the bounds from CMB spectral distortions can be achieved with proposed experiments such as PIXIE.
Authors:
 [1] ;  [2] ;  [3]
  1. Univ. of Wisconsin, Madison, WI (United States)
  2. Univ. Montpellier II (France). Lab. Univers. et Particules de Monpellier
  3. Univ. of Washington, Seattle, WA (United States). Dept. of Physics
Publication Date:
OSTI Identifier:
1254739
Report Number(s):
SLAC-PUB--16533
TRN: US1601409
DOE Contract Number:
AC02-76SF00515
Resource Type:
Technical Report
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
US DOE Office of Science (DOE SC);High Energy Physics (HEP)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; HIGGS BOSONS; PHOTONS; MIXING ANGLE; RELICT RADIATION; LIMITING VALUES; NUCLEOSYNTHESIS; GEV RANGE; MEV RANGE; DECAY; MASS Phenomenology-HEP; HEPPH