Evidence for Particle that is its own Antiparticle

Most of the discussion is here:

https://news.ycombinator.com/item?id=14839427

At this moment there are also two comments here: https://news.ycombinator.com/item?id=14817322

There are also other submissions:

https://news.ycombinator.com/item?id=14817206

https://news.ycombinator.com/item?id=14833208

https://news.ycombinator.com/item?id=14840123

It should be called the cleave particle