Fine Structure

The Curious Case of Y(4140)

CDF physicists have found a strange new particle produced rarely from B+ mesons (plus a K+, if you're keeping tabs on conservation) in proton/antiproton collisions which they're currently calling Y(4140). It's not completely unprecedented, however. Last year, CDF physicists also measured a similar particle currently called X(3872).

I thought we had that whole standard model thing pinned down. Apparently not.