Exploring hyperons and hypernuclei with lattice QCD

Journal Article · Wed Jan 01 04:00:00 EST 2003 · Nuclear Physics

OSTI ID:909506

Beane, S R; Bedaque, P F; Parreno, A; Savage, M J

In this work we outline a program for lattice QCD that wouldprovide a first step toward understanding the strong and weakinteractions of strange baryons. The study of hypernuclear physics hasprovided a significant amount of information regarding the structure andweak decays of light nuclei containing one or two Lambda's, and Sigma's.From a theoretical standpoint, little is known about the hyperon-nucleoninteraction, which is required input for systematic calculations ofhypernuclear structure. Furthermore, the long-standing discrepancies inthe P-wave amplitudes for nonleptonic hyperon decays remain to beunderstood, and their resolution is central to a better understanding ofthe weak decays of hypernuclei. We present a framework that utilizesLuscher's finite-volume techniques in lattice QCD to extract thescattering length and effective range for Lambda-N scattering in both QCDand partially-quenched QCD. The effective theory describing thenonleptonic decays of hyperons using isospin symmetry alone, appropriatefor lattice calculations, is constructed.

• Research Organization: Ernest Orlando Lawrence Berkeley NationalLaboratory, Berkeley, CA (US)
• Sponsoring Organization: USDOE Director. Office of Science. Office of High Energy andNuclear Physics. Office of Nuclear Physics
• DOE Contract Number: AC02-05CH11231
• OSTI ID: 909506
• Report Number(s): LBNL--53972; BnR: KB0301020
• Journal Information: Nuclear Physics, Journal Name: Nuclear Physics Vol. A747
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS