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Title: Pentaquark Searches at Jlab

Abstract

Since LEPS collaboration reported the first evidence for a S=+1 baryon resonance in early 2003 with a mass of 1.54 GeV, dubbed Θ+, more than ten experiments have confirmed this exotic state, among these two carried out at Jefferson Laboratory. At the same time, there are a number of experiments, mostly at high energies, that report null results. To try to clarify this situation, during the past year, The CLAS Collaboration at Jefferson Laboratory has undertaken a second generation high-statistics experimental program to search for exotics baryons. Here the preliminary results from these experiments are reported.

Authors:
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility, Newport News, VA
Sponsoring Org.:
USDOE - Office of Energy Research (ER)
OSTI Identifier:
898959
Report Number(s):
JLAB-PHY-05-487; DOE/ER/40150-4163
TRN: US0801633
DOE Contract Number:
AC05-84ER40150
Resource Type:
Conference
Resource Relation:
Journal Name: Nuclear Physics B - Proceedings Supplements; Journal Volume: 164; Conference: QCD 05: 12th International QCD Conference: 20 Years Of The QCD-Montpellier Conference, 4-8 Jul 2005, Montpellier, France
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; BARYONS; CEBAF ACCELERATOR; QUANTUM CHROMODYNAMICS

Citation Formats

Rossi, Patrizia. Pentaquark Searches at Jlab. United States: N. p., 2007. Web. doi:10.1016/j.nuclphysbps.2006.11.085.
Rossi, Patrizia. Pentaquark Searches at Jlab. United States. doi:10.1016/j.nuclphysbps.2006.11.085.
Rossi, Patrizia. Mon . "Pentaquark Searches at Jlab". United States. doi:10.1016/j.nuclphysbps.2006.11.085. https://www.osti.gov/servlets/purl/898959.
@article{osti_898959,
title = {Pentaquark Searches at Jlab},
author = {Rossi, Patrizia},
abstractNote = {Since LEPS collaboration reported the first evidence for a S=+1 baryon resonance in early 2003 with a mass of 1.54 GeV, dubbed Θ+, more than ten experiments have confirmed this exotic state, among these two carried out at Jefferson Laboratory. At the same time, there are a number of experiments, mostly at high energies, that report null results. To try to clarify this situation, during the past year, The CLAS Collaboration at Jefferson Laboratory has undertaken a second generation high-statistics experimental program to search for exotics baryons. Here the preliminary results from these experiments are reported.},
doi = {10.1016/j.nuclphysbps.2006.11.085},
journal = {Nuclear Physics B - Proceedings Supplements},
number = ,
volume = 164,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}

Conference:
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  • We review the current experimental situation of pentaquark searches, and second generation experiments, with emphasis on the Jefferson Lab program.
  • After the claiming of the possible discovery of a pentaquark state, many experiments reported positive and negative results opening a discussion about the pentaquark existence. New experiments with high resolution and high statistics are needed to solve the controversy. Jefferson Lab started a comprehensive program to search for pentaquark in photoproduction at threshold on proton and deuteron targets, collecting more than 10 times the existing statistics. The first experiment on the proton (g11) just finished to analyze the data and in a short time will be able to report about the pentaquark search.
  • No abstract prepared.
  • Experimental results of a search for the {Xi}{sub 3/2}(1860) cascade pentaquark state in data collected with the CDF 2 Detector in Run II at the Tevatron are presented. No evidence for these states in the neutral {Xi}{sup -}{pi}{sup +} and doubly charged {Xi}{sup -}{pi}{sup -} modes has been found. Preliminary upper limits on yields at 1862 MeV/c{sup 2} relative to the well established resonance {Xi}*(1530){sup 0} are presented.
  • The production of a possible, exotic S=1 pentaquarks off protons and neutrons is being investigated in Hall B at Jefferson Lab. Three dedicated experiments have been carried out to search for pentaquark signals using the CLAS detector in conjunction with a photon beam incident on hydrogen and deuterium targets. The status of on-going analyses and preliminary results from a variety of channels are presented.