Phenomenology of colored radiative neutrino mass model and its implications on cosmic-ray observations

  • We extend the colored Zee-Babu model with a gauged U(1)B-L symmetry, and a scalar singlet dark matter (DM) candidate S. The spontaneous breaking of U(1)B-L leaves a residual Z2 symmetry that stabilizes the DM, and generates a tiny neutrino mass at the two-loop level with the color seesaw mechanism. After investigating the DM and flavor phenomenology of this model systematically, we further focus on its imprint on two cosmic-ray anomalies:The Fermi-LAT gamma-ray excess at the Galactic Center (GCE), and the PeV ultra-high energy (UHE) neutrino events at the IceCube. We found that the Fermi-LAT GCE spectrum can be well-fitted by DM annihilation into a pair of on-shell singlet Higgs mediators while being compatible with the constraints from the relic density, direct detections, and dwarf spheroidal galaxies, in the Milky Way. Although the UHE neutrino events at the IceCube could be accounted for by the resonance production of a TeV-scale leptoquark, the relevant Yukawa couplings have been severely limited by the current low-energy flavor experiments. We subsequently derive the IceCube limits on the Yukawa couplings by employing its latest six-year data.
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Ran Ding, Zhi-Long Han, Li Huang and Yi Liao. Phenomenology of colored radiative neutrino mass model and its implications on cosmic-ray observations[J]. Chinese Physics C, 2018, 42(10): 103101. doi: 10.1088/1674-1137/42/10/103101
Ran Ding, Zhi-Long Han, Li Huang and Yi Liao. Phenomenology of colored radiative neutrino mass model and its implications on cosmic-ray observations[J]. Chinese Physics C, 2018, 42(10): 103101.  doi: 10.1088/1674-1137/42/10/103101 shu
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Received: 2018-05-28
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    Supported by the NSFC (11575089, 11025525), the National Key Research and Development Program of China (2017YFA0402200) and the CAS Center for Excellence in Particle Physics (CCEPP).

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Phenomenology of colored radiative neutrino mass model and its implications on cosmic-ray observations

  • 1.  Center for High Energy Physics, Peking University, Beijing 100871, China
  • 2.  School of Physics and Technology, University of Jinan, Jinan, Shandong 250022, China
  • 3.  State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, China
  • 4. Center for High Energy Physics, Peking University, Beijing 100871, China
  • 5. State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, China
  • 6. School of Physics, Nankai University, Tianjin 300071, China
Fund Project:  Supported by the NSFC (11575089, 11025525), the National Key Research and Development Program of China (2017YFA0402200) and the CAS Center for Excellence in Particle Physics (CCEPP).

Abstract: We extend the colored Zee-Babu model with a gauged U(1)B-L symmetry, and a scalar singlet dark matter (DM) candidate S. The spontaneous breaking of U(1)B-L leaves a residual Z2 symmetry that stabilizes the DM, and generates a tiny neutrino mass at the two-loop level with the color seesaw mechanism. After investigating the DM and flavor phenomenology of this model systematically, we further focus on its imprint on two cosmic-ray anomalies:The Fermi-LAT gamma-ray excess at the Galactic Center (GCE), and the PeV ultra-high energy (UHE) neutrino events at the IceCube. We found that the Fermi-LAT GCE spectrum can be well-fitted by DM annihilation into a pair of on-shell singlet Higgs mediators while being compatible with the constraints from the relic density, direct detections, and dwarf spheroidal galaxies, in the Milky Way. Although the UHE neutrino events at the IceCube could be accounted for by the resonance production of a TeV-scale leptoquark, the relevant Yukawa couplings have been severely limited by the current low-energy flavor experiments. We subsequently derive the IceCube limits on the Yukawa couplings by employing its latest six-year data.

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