ZZ diboson

They were first observed by the experiments at the Large Electron–Positron Collider (ALEPH, DELPHI, L3 and OPAL).

The first observation in a hadron collider was made by the scientists of DØ collaboration at Fermilab.

ZZ dibosons are the latest in a series of observations of pairs of gauge bosons (force-carrying particles) by DØ and its sister experiment CDF (also at Tevatron).

Final analysis of the data for this discovery was done by a team of international researchers including scientists of American, Belgian, British, Georgian, Italian, and Russian nationalities.

The ZZ (Z0 + Z0) is the combination which has the lowest predicted likelihood of production in the Standard Model due to the smaller couplings.

Feynman diagrams for important contributions to ZZ production. Diagrams can be distinguished as those involving the H boson (top) and those that give rise to continuum-ZZ production (bottom) which interact destructively with each other. [ 1 ]