ࡱ> 7 bjbjUU )7|7| ^l$$$8\ h0<l $ "J7_ `ɟgBV$O_$0W  _  News Release 12000 Jefferson Avenue Newport News VA 23606 (757) 269-7689 Fax (757) 269-7398 For assistance April 16-19, contact Kandice Carter kcarter@jlab.org or 301-467-0176 Embargoed: 12:33 p.m. EDT April 16, 2005 Is It or Isnt It? Pentaquark Debate Heats Up New data from DOEs Thomas Jefferson National Accelerator Facility (Jefferson Lab) shows the pentaquark doesnt appear in one place it was expected. The result contradicts earlier findings in this same region and adds to the controversy over whether research groups from around the world have caught a glimpse of the so-called pentaquark, a particle built of five quarks. Researchers in Jefferson Labs CEBAF Large Acceptance Spectrometer (CLAS) collaboration took data with a high energy photon beam on a liquid hydrogen target. In a similar experiment conducted by the SAPHIR collaboration at the ELectron Stretcher Accelerator (ELSA) in Bonn, Germany, a signal revealing a pentaquark was observed. However, the Jefferson Lab team, whose data contained two orders of magnitude better statistics, found no evidence of the pentaquark. Raffaella De Vita, a staff scientist at Italys Istituto Nazionale di Fisica Nucleare in Genova and a Jefferson Lab CLAS collaboration member, will present the preliminary results in a post-deadline talk at APS April Meeting 2005 Session B4 on Saturday, April 16. What the Jefferson Lab CLAS collaboration data shows is that in this particular channel there is no pentaquark at a level of precision at least 50 times higher than the published SAPHIR result. The CLAS researchers in this analysis will take another round of data in 2006 to look for the pentaquark in a different channel and at higher energies. Jefferson Lab researchers are currently in the midst of several dedicated hunts for the pentaquark, including an experiment repeating Jefferson Labs original pentaquark search with much higher statistics. That data is still being analyzed, and researchers expect to present the results later this year. The first pentaquark sighting was announced by SPring-8 researchers in the spring of 2003, and the same year, Jefferson Lab, ITEP and ELSA researchers announced that they, too, may have spotted tantalizing hints of the particle in data previously taken in other experiments. For instance, the SAPHIR collaborations evidence of the Theta-plus pentaquark came from data they took in 1997/98 and indicated a pentaquark mass of 1540 MeV. Several experiments since then have backed up these early sightings, while others have failed to confirm the sightings. Most ordinary matter is built of quarks. Theyre usually found in twos (as particles called mesons) and threes (as particles called baryons, such as protons and neutrons). While the pentaquarks five-quark configuration is not forbidden by the theory of the strong interaction, finding one would be the first sighting of an exotic baryon. ______________________________ # ____________________________ Jefferson Lab is managed and operated for the U.S. Department of Energys Office of Science by the Southeastern Universities Research Association, a consortium of 61 universities in the southeast. For more information or color photos, please contact Linda Ware at (757) 269-7689. 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