Photo of Hall D equipment

Experimental Hall D

Hall D is the newest of Jefferson Lab’s four experimental halls. It is dedicated to the operation of a large-acceptance detector for experiments with a high-energy, polarized photon beam. The experiments are carried out by an international group of scientists called the GlueX collaboration.

The goal of the GlueX collaboration is to confirm a new property of the strong force – the force that binds together the quarks into protons and neutrons, and also binds the protons and neutrons into atomic nuclei. This new property predicts the existence of new (as-yet-unobserved) particles called hybrid mesons. While an ordinary meson consists of a quark and an anti-quark bound by the strong force, the hypothetical hybrid meson contains an additional object associated with the force itself. Such mesons should have certain properties – called quantum numbers – different from ordinary mesons. The goal of the GlueX experiment is the search and study of these hybrid mesons.   

As with other halls at Jefferson Lab, Hall D is a facility that is not limited to a single scientific topic. Other experiments approved by the Program Advisory Committee (PAC) will measure the widths of pseudoscalar mesons and the pion polarizability in two-photon (Primakoff) reactions, and study rare decays of the eta-meson. Additional scientific topics are also under consideration.

The GlueX collaboration consists of more than 125 researchers from 28 institutions and 10 countries.

For more detailed and technical information about Hall D and its experimental program, click here.