The Gluex Experiment

Project Outline

The primary goal of the GlueX Experiment is the definitive and detailed mapping of the spectrum of a new family of particles called hybrid mesons, and specifically starting with those that carry exotic quantum numbers; these are not found in ordinary matter. New experimental information is absolutely critical in finding the answer to an outstanding and fundamental question in physics - a quantitative understanding of the confinement mechanism in quantum chromodynamics.

The nature of the interaction among quarks is best investigated with photons (quanta of pure energy). For this reason, the investigation of exotic particles will be pursued at the proposed, future Hall D facility at Jefferson Lab, which will take advantage of the future energy upgrade at this laboratory. Linearly polarized photons produced by electrons from an energy-upgraded CEBAF will be the probe used to uncover the exotic hybird spectrum. In addition to the GlueX detector, the project includes a beam line and an above-ground tagger building and detector building to be located off the stub at the east end of the north linac of the CEBAF accelerator. This project requires that the electron energy of CEBAF will be increased to 12 GeV.

The GlueX collaboration has completed the R&D of the most critical subsystems and has progressed to the construction of several long lead items, while planning for beam tests and the eventual commissioning stages. A vigorous collaboration with theorists is leading to the necessary analysis and theoretical tools that will be necessary to extract timely physics results from the GlueX data. More information about the physics of the GlueX project can be found in articles in the September/October 2000 issue of American Scientist and in the September 2000 issue of the CERN Courier.

We have the responsibility for one of the largest sub-systems (the electromagnentic barrel calorimeter - BCAL) and plays a leading role in the governance of the collaboration. Our team consists of two professors, one research scientist, one research assistant and a number of graduate students. Our efforts have been divided among R&D first on the design and presently on the construction of spaghetti calorimeter modules, and on the R&D and production testing of novel solid state photo-sensors known as large-area silicon photo multiplier arrays.

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