Five years later, however, physicists are still holding off from claiming they have made a quark-gluon plasma.

The ultimate goal, he said, is to produce a state of matter never before recorded on earth and known as a quark-gluon plasma.

This was used to investigate the properties of quark-gluon plasma.

So I don't view this, the fact that we can't call it quark-gluon plasma, as a negative thing.

Other states, such as quark-gluon plasmas, are believed to be possible but remain theoretical for now.

It is the quark-gluon plasma that physicists here are trying to make and study.

It makes no difference to the advancement of science who first cooks up a quark-gluon plasma.

Still higher energies are necessary to achieve a quark-gluon plasma.

This primordial state of matter, called the quark-gluon plasma, has never been observed since.

But we've got a real object to describe here, something made in a quark-gluon plasma.