very particular

CERN's LHC has discovered their second new subatomic particle, named Xi(b)*

After crashing particles together about 530 trillion times, scientists working on the CMS experiment at Switzerland's Large Hadron Collider (LHC) saw unmistakable evidence for a new type of "beauty baryon."

Baryons are particles made of three quarks (the building blocks of the protons and neutrons that populate the nuclei of atoms). Beauty baryons are baryons that contain at least one beauty quark (also known as a bottom quark). The new specimen is a particular type of excited beauty baryon called Xi(b)*, pronounced "csai-bee-star." [...]

The Xi(b)* particle had been predicted by a physics theory called quantum chromodynamics, which predicts how quarks bind together to form heavy particles, but had never before been observed.