Dichromatic dark matter
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Su_Dichromatic dark.pdf
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561.52 KB
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Checksum (MD5)
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Author(s)
Bai, Yang
Su, Meng
Zhao, Yue
Date Issued
February 2013
Journal
Journal of High Energy Physics
Publisher
Springer-Verlag/International School for Advanced Studies (SISSA)
Citation
Bai, Yang, Meng Su, and Yue Zhao. “Dichromatic Dark Matter.” J. High Energ. Phys. 2013, no. 2 (February 2013).
Version
Final published version
Abstract
Both the robust INTEGRAL 511 keV gamma-ray line and the recent tentative hint of the 135 GeV gamma-ray line from Fermi-LAT have similar signal morphologies, and may be produced from the same dark matter annihilation. Motivated by this observation, we construct a dark matter model to explain both signals and to accommodate the two required annihilation cross sections that are different by more than six orders of magnitude. In our model, to generate the low-energy positrons for INTEGRAL, dark matter particles annihilate into a complex scalar that couples to photon via a charge-radius operator. The complex scalar contains an excited state decaying into the ground state plus an off-shell photon to generate a pair of positron and electron. Two charged particles with non-degenerate masses are necessary for generating this charge-radius operator. One charged particle is predicted to be long-lived and have a mass around 3.8 TeV to explain the dark matter thermal relic abundance from its late decay. The other charged particle is predicted to have a mass below 1 TeV given the ratio of the two signal cross sections. The 14 TeV LHC will concretely test the main parameter space of this lighter charged particle.
MIT Department
Massachusetts Institute of Technology. Department of Physics
MIT Kavli Institute for Astrophysics and Space Research
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Creative Commons Attribution
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1007/jhep02(2013)097
