Search for the pentaquark resonance signature in lattice QCD

Journal Article · Tue Mar 01 04:00:00 EST 2005 · Physical Review D

DOI:https://doi.org/10.1103/PhysRevD.72.014502· OSTI ID:837467

Lasscock, B G; Hedditch, J; Leinweber, D B; Melnitchouk, W; Thomas, A W; Williams, A G; Young, R D; Zanotti, J M

Claims concerning the possible discovery of the $$\Theta^+$$ pentaquark, with minimal quark content $$uudd\bar{s}$$, have motivated our comprehensive study into possible pentaquark states using lattice QCD. We review various pentaquark interpolating fields in the literature and create a new candidate ideal for lattice QCD simulations. Using these interpolating fields we attempt to isolate a signal for a five-quark resonance. Calculations are performed using improved actions on a large $$20^{3} \times 40$$ lattice in the quenched approximation. The standard lattice resonance signal of increasing attraction between baryon constituents for increasing quark mass is not observed for spin-1/2 pentaquark states. We conclude that evidence supporting the existence of a spin-1/2 pentaquark resonance does not exist in quenched QCD.

• Research Organization: Thomas Jefferson National Accelerator Facility, Newport News, VA
• Sponsoring Organization: USDOE; USDOE Office of Energy Research (ER)
• DOE Contract Number: AC05-84ER40150
• OSTI ID: 837467
• Report Number(s): JLAB-THY-05-305; DOE/ER/40150-3183
• Journal Information: Physical Review D, Journal Name: Physical Review D Vol. 72; ISSN 1550-7998
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BARYONS
QUANTUM CHROMODYNAMICS
QUARKS
RESONANCE