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In this Letter, we study the gamma-ray signatures subsequent to theproduction of a Higgs boson in space by dark matter annihilations. Weinvestigate the cases where the Higgs boson is produced at rest or slightlyboosted and show that such configurations can produce characteristic bumps inthe gamma-ray data. These results are relevant in the case of the StandardModel-like Higgs boson provided that the dark matter mass is about 63 GeV, 109GeV or 126 GeV, but can be generalised to any other Higgs boson masses. Here,we point out that it may be worth looking for a 63 GeV line since it could bethe signature of the decay of a Standard Model-like Higgs boson produced inspace, as in the case of a di-Higgs final state if m_DM ~ 126 GeV. We show thatone can set generic constraints on the Higgs boson production rates using itsdecay properties. In particular, using the Fermi-LAT data from the galacticcenter, we find that the dark matter annihilation cross section into gamma + aStandard Model-like Higgs boson produced at rest or near rest cannot exceed<sigma v> ~ a few 10^-25 cm^3/s or <sigma v> ~ a few 10^-27 cm^3/srespectively, providing us with information on the Higgs coupling to the darkmatter particle. We conclude that Higgs bosons can indeed be used as messengersto explore the dark matter mass range.

Observing Higgs boson production through its decay into gamma-rays: A messenger for Dark Matter candidates