The Crystal Barrel Server at

Welcome to the Crystal Barrel Server maintained by Carnegie Mellon University. This is the home page providing WorldWideWeb information on the Crystal Barrel experiment at LEAR.

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The Crystal Barrel Experiment ran at the Low Energy Antiproton Ring, (LEAR), from 1989 through the end of 1996 and studied antiproton proton and antiproton deuterium annihilations both at rest and in flight. The detector is a nearly 4pi, high resolution system for both charged particles and photons.

One of the main goals of the experiment was to search for gluonic exciations in the meson spectrum. This includes both glueballs, and hybrid mesons. Of particular interest is the scalar glueball candidate, the f0(1500), which Crystal Barrel discovered. This state has been studied in detail, and its peculiar decay pattern mapped out. In particular, this decay pattern to pairs of pseudoscalar mesons makes this a prome candidate for the groundstate scalar glueball, particularly if it is mixed with the normal scalar mesons.

Crystal Barrel has also observed a particle with explicitly exotic quantum numbers decaying into an eta and a pion. The state with mass near 1400 MeV/c2 and width of about 300 MeV/c2 does not fit most current models of a hybrid mesons, but its 1-+ quantum numbers mean that this state is clearly something beyond the quark-antiquark picture of mesons.

Publications and Theses from the Crystal Barrel Experiment

Ph.D. Theses
Figure Archive
(mirror at LBL)

Contact Information for the Crystal Barrel

Ulrich Wiedner
Fax and
Author List

Infomation on the Experiment

Schedule of
monthly meetings
Agendas of
monthly meetings
Crystal Barrel Notes
Run Periods
and data

Review articles on Crystal Barrel
Related NON Crystal Barrel Publications

Software for the Crystal Barrel Experiment

VERSION: The most up to date software versions,
and the cradles to make them.
Cbgeant Mini Guide.
An up to date miniguide on running the Crystal Barrel Monte
Carlo, including answers to frequently asked questions.
Cbdisp Mini Guide.
An up to date miniguide on running the Crystal Barrel event
display program.
MANUALS: how to use Crystal Barrel software.
LaTeX source code to all the Crystal Barrel software manuals.
CB-Notes Describing Software.
A list of all Crystal Barrel notes related to software issues.
Mathematica macros.
A set of macros for computing helicity amplitudes within mathematica.

Primary Crystal Barrel Servers

The Crystal Barrel WWW server at CERN.
The Crystal Barrel WWW server at Carnegie Mellon University.

Download a gzipped tarball of this web site.
Back to the CMU Medium Energy Home Page.

Last updated on the 4'th of January, 2005.