Spin-3/2 Pentaquark Resonance Signature

Conference · Thu Sep 29 04:00:00 EDT 2005

OSTI ID:850374

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

We search for the standard lattice resonance signature of attraction between the resonance constituents which leads to a bound state at quark masses near the physical regime. We study a variety of spin-1/2 interpolators and for the first time, interpolators providing access to spin-3/2 pentaquark states. In looking for evidence of binding, a precise determination of the mass splitting between the pentaquark state and its lowest-lying decay channel is performed by constructing the effective mass splitting from the various two-point correlation functions. While the binding of the pentaquark state is not a requirement, the observation of such binding would provide compelling evidence for the existence of the theta+ pentaquark resonance. Evidence of binding is observed in the isoscalar spin-3/2 positive parity channel, making it an interesting state for further research.

• Research Organization: TJNAF (Thomas Jefferson National Accelerator Facility, Newport News, VA)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-84ER40150
• OSTI ID: 850374
• Report Number(s): JLAB-THY-05-426; DOE/ER/40150-3601
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BOUND STATE
CORRELATION FUNCTIONS
DECAY
EFFECTIVE MASS
PARITY
QUARKS
RESONANCE