Lattice QCD studies of pentaquarks and exotics

Conference · Wed Sep 14 04:00:00 EDT 2005

OSTI ID:876065

Lasscock, Ben; Hedditch, John; Kamleh, Waseem; Leinweber, Derek; Melnitchouk, Wolodymyr; Thomas, Anthony; Williams, Anthony; Young, Ross; Zanotti, James

The possible discovery of the {Theta}{sup +} pentaquark has motivated a number of studies into its nature using lattice QCD. Initial studies focused on spin-1/2 states and more recently also spin-3/2 states. Here we report the results of the first exploratory study in quenched lattice QCD of pentaquarks with both spin-1/2 and spin-3/2 using the FLIC fermion action. We do not find any evidence for the standard lattice resonance signature of attraction (i.e. binding at quark masses near the physical regime) in the spin-1/2 channels or in the J{sup P} = 3/2{sup -} channel. Some evidence of binding is inferred in the isoscalar 3/2{sup +} channel. We also present the results of our study into exotic meson states using hybrid meson interpolators with explicit gluonic degrees of freedom. We find a candidate for the J{sup PC} = 1{sup {-+}} exotic meson which has a mass consistent with the {pi}{sub 1}(1600) experimental candidate.

• Research Organization: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA
• Sponsoring Organization: USDOE - Office of Energy Research (ER)
• DOE Contract Number: AC05-84ER40150
• OSTI ID: 876065
• Report Number(s): JLAB-THY-06-465; DOE/ER/40150-3724
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
DEGREES OF FREEDOM
FERMIONS
HADRONS
MESONS
PHYSICS
QUANTUM CHROMODYNAMICS
QUARKS
RESONANCE