Tetraquarks

[PB666]

http://www.sciencealert.com/physicists-just-discovered-an-entire-family-of-new-particles-in-the-lhc

Seems like the forum is drifting away from the science and needs a bit of an electric shock.

[Core]

Wha...? There are smaller things in atoms?

I thought I was aware of this, but still...

[K^2]

Is it ok that particle physicists have been talking about pentaquarks and tetraquarks for decades now? I mean, it's nice to have some experimental data, but they are making it sound like a revolutionary discovery.

[PB666]

http://home.cern/about/updates/2016/07/lhcb-unveils-new-particles

Actually since 2007, but this links displays that they have recently discovered 3 new types.

All seem to have antimatter components, though they did not discuss stability.

[K^2]

There is no need to discuss stability. Each of these contains a quark and an anti-quark, because that's the only way for 4/5 quarks to have color-neutrality. This guarantees decay in far less than 10^(-10) of a second. The only impact these particles have on anything is small corrections on intranuclear forces, as do pretty much all quark bound states.