Interesting signal at dark matter detector

Quote

With more data than ever before, a surprising signal has emerged above the expected background in an unexpected place: at low, rather than high, energies. There are three possible explanations that we know of:

1. it could be an unaccounted-for contaminant, like tritium,
2. it could be that neutrinos have a surprising property, different than what the Standard Model predicts,
3. or, most excitingly, it could be our first evidence for a special type of light dark matter, such as an axion-like particle.

https://www.forbes.com/sites/startswithabang/2020/06/17/is-it-dark-matter-mystery-signal-goes-bump-in-worlds-most-sensitive-detector/

Another article here: https://www.quantamagazine.org/dark-matter-experiment-finds-unexplained-signal-20200617/

And a Twitter thread from one of the physicists involved: