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  • Letter
  • Open Access

ν scalar in the early Universe and (g−2)μ

Jia Liu1,2,*, Navin McGinnis3,†, Carlos E. M. Wagner4,5,6,‡, and Xiao-Ping Wang7,8,§

  • 1School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
  • 2Center for High Energy Physics, Peking University, Beijing 100871, China
  • 3TRIUMF, 4004 Westbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
  • 4High Energy Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
  • 5Physics Department and Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA
  • 6Kavli Institute for Cosmological Physics, University of Chicago, Chicago, Illinois 60637, USA
  • 7School of Physics, Beihang University, Beijing 100083, China
  • 8Beijing Key Laboratory of Advanced Nuclear Materials and Physics, Beihang University, Beijing 100191, China

  • *jialiu@pku.edu.cn
  • †nmcginnis@triumf.ca
  • ‡cwagner@uchicago.edu
  • §Corresponding author. hcwangxiaoping@buaa.edu.cn
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Phys. Rev. D 105, L051702 – Published 14 March, 2022

DOI: https://doi.org/10.1103/PhysRevD.105.L051702

Abstract

We investigate a concrete scenario of a light scalar with a mass around 1 MeV which can be connected to the origin of neutrino masses and simultaneously survive current bounds on relativistic degrees of freedom in the early universe. A feeble coupling to the Standard Model neutrinos can relax stringent bounds on the decays to photons inferred from the measured value of Neff. Interestingly, we find that such a scalar whose diphoton coupling is generated by a tree-level coupling to the muon of similar strength as that of the Standard Model Higgs boson can simultaneously explain the longstanding discrepancy in the measured value of the muon magnetic moment. We present a possible ultraviolet (UV) completion of this scenario providing a link between new physics in the early universe and the generation of neutrino masses.

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Phys. Rev. D 105, L051702– Published 14 March, 2022
  • Received 18 November 2021
  • Accepted 23 February 2022
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