3/6/2008PHP March Photon-hadron physics with the GlueX detector at Jefferson Lab Curtis A. Meyer, Spokesperson GlueX CH L-2

3/6/2008PHP March History of GlueX The first meeting of what became the GlueX Collaboration occurred in July 1997 at Indiana University. The meetings that followed looked at how one could explore the spectrum of hybrid mesons using photon beams. In 1999, what is now the GlueX collaboration was formed. The first PAC presentation was made and the first review of the physics program occurred. The experiment was listed as a key part of the 12 GeV upgrade in the 2002 NSAC Long range Plan. Department of Energy Milestones for the 12 GeV Upgrade: April 2004 CD0, February 2006 CD1, November 2007 CD2 Late 2008 anticpated CD3 (start of construction) 2015 anticipatre CD4 (start of physics)

3/6/2008PHP March The GlueX experiment has been designed to carry out an amplitude analysis of many different final states involving charged particles and photons to study the reaction: ° p ! (n,p) X where X ultimately decays to final states with 3-6 pseudoscalar mesons. Tagged photons up to nearly 12 GeV. High photon flux. Linear polarization using coherent bremsstrahlung. Hermetic Detector for photons and charged particles. Some PID in initial stages, plans to significantly improve this. Very large data sets with relatively minimal trigger bias. The Physics of GlueX Search for exotic hybrid mesons to discover and map out their spectrum and properties.

3/6/2008PHP March Lattice QCD From G. Bali Flux Tubes Realized Confinement arises from flux tubes and their excitation leads to a new spectrum of mesons Color Field: Because of self interaction, confining flux tubes form between static color charges

3/6/2008PHP March Gluonic Excitations -- Hybrids ground-state flux-tube m=0 excited flux-tube m=1 Lattice calculations nonet is the lightest UKQCD (97) 1.87  0.20 MILC (97) 1.97  0.30 MILC (99) 2.11  0.10 Lacock(99) 1.90  0.20 Mei(02) 2.01  0.10 Bernard(04) § Some with non quark- antiquark QNs

3/6/2008PHP March What other physics can be done? Tagged photons up to nearly 12 GeV. High photon flux. Linear polarization using coherent bremsstrahlung. Hermetic Detector for photons and charged particles. Some PID in initial stages, plans to significantly improve this. Very large data sets with relatively minimal trigger bias.

3/6/2008PHP March What other physics can be done? During this workshop, we will see a number of discussions of other physics that can be carried out by the GlueX experiment. Some of these can be carried out simply using the GlueX data. Some will require slightly modified running of the experiment (target, photon beam energy ….) Some will require the addition of more particle identification capability. The purpose of this workshop is to get people thinking about what can be done in the GlueX experiment, and attract people to the experiment that are interested in doing this physics.

3/6/2008PHP March Outline of the Meeting Thursday Morning: GlueX detector and Upgrades Afternoon: Exclusive reactions at high momentum transfer and baryon resonances Friday Morning: Charm production with GlueX Afternoon: Chiral anomaly and Primakoff effect Photoproduction with nuclear targets Saturday: Morning: Spectroscopy with GlueX Lots of time for discussion during the sessions and with people during lunch and dinner.

3/6/2008PHP March Workshop Dinner 6:30pm tonight: Dinner at Carrabba’s Italian Grill Hornsby Lane Newport News, VA :30am to 9:00am Continental Breakfast

3/6/2008PHP March Organizing Committee: Elke-Caroline Aschenauer Jozef Dudek Alex Dzierba George Lolos Curtis Meyer Christian Weiss From the Welcome to the workshop, we all look forward to some very interesting discussions and ideas.

3/6/2008PHP March Thanks to our Supporters The JSA Initiative Fund Jefferson Lab Carnegie Mellon University Also, thanks to Lorelei Carlson for travel and logistical support.