Spin-3/2 Nucleon and Delta Baryons in Lattice QCD

Journal Article · Sat Mar 01 04:00:00 EST 2003

OSTI ID:809013

Zanotti, J M; Leinweber, D B; Williams, A G; Zhang, J B; Melnitchouk, Wally; Choe, S

We present first results for masses of spin-3/2 N and Delta baryons in lattice QCD, using Fat-Link Irrelevant Clover (FLIC) fermions. Spin-3/2 interpolating fields providing overlap with both spin-3/2 and spin-1/2 states are considered. In the isospin-1/2 sector. we observe, after appropriate spin and parity projection, a strong signal for the J{sup P} = 3/2{sup -} state together with a weak but discernible signal for the 3/2{sup +} state with a mass splitting near that observed experimentally. We also find good agreement between the 1/2{sup {+-}} masses and earlier nucleon mass simulations with the standard spin-1/2 interpolating field. For the isospin-3/2 Delta states, clear mass splittings are observed between the various 1/2{sup {+-}} and 3/2{sup {+-}} channels, with the calculated level orderings in good agreement with those observed empirically.

• Research Organization: Thomas Jefferson National Accelerator Facility, Newport News, VA (US)
• Sponsoring Organization: USDOE Office of Energy Research (ER) (US)
• DOE Contract Number: AC05-84ER40150
• OSTI ID: 809013
• Report Number(s): JLAB-THY-03-29; DOE/ER/40150-2461
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CLOVER
DELTA BARYONS
FERMIONS
NUCLEONS
PARITY
QUANTUM CHROMODYNAMICS
SPIN