The Lhc particle accelerator, near Ginevara, is famous for the discovery of the Higgs boson . But the immense cathedral of science is an indispensable structure for modern physics, because experiments and impossible observations can be carried out until a few years ago. The Large Hadron Collider beauty experiment has indeed confirmed the existence of a strange particle or, as the physicists say, exotic, with a structure never seen before.
It is an hadron, that is, it belongs to a family of particles, such as protons or neutrons, normally composed of three quarks, or a quark and an antiquark. Intuited a few years ago by a Japanese experiment, but confirmed these days, the hadron called Z (4430) is instead composed of four quarks. The particle goes against the Gell-Mann and Zweig model, and shows that physics, and especially the LHC, still has many surprises in store.


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