Searching for Gamma-ray Spectral Lines in Dwarf Galaxies with HAWC

Observational evidence strongly suggests the majority of matter in the Universe is non-baryonic dark matter. Several models suggest dark matter is a particle, yet the particle nature of dark matter is still unknown. In several theories dark matter annihilation or decay produces gamma rays. Specifically, if dark matter annihilates or decays directly into two gamma rays (or a gamma ray and a neutral particle like a Z boson), a monochromatic spectral line is created. At TeV energies, no other processes are expected to produce spectral lines, making this a very clean indirect dark matter search channel. With the development of event-by-event energy reconstruction, we can search for spectral lines with the High Altitude Water Cherenkov (HAWC) Observatory. HAWC is a wide field of view survey instrument located in central Mexico that observes gamma rays from hundreds of GeV to >100 TeV. We will present results from a recent search for spectral lines from local dark matter dominated dwarf galaxies.