Portside

As powerful as the Large Hadron Collider is, it does have one blind spot: long-lived neutral particles that can slip through the detector before they're found. Coming up soon is an upgrade, called MATHUSLA, that hopes to change that.

Assuming the results hold up, the particle raises the question: how is this put together? There are two options, as shown at top. One is that it's put together like known particles, with multiple quarks interacting through gluons. The alternative is that it's a hybrid composed of two particles we already know about. But this would have to be held together by a force we're not familiar with. Either way, there's some distinctive physics waiting for a more detailed analysis