Searches for a possible strangeness S = -2 dibaryon

Conference · Fri Jan 01 00:00:00 EST 1982

OSTI ID:7061628

Barnes, P. D.

Since the advent of QCD there has been a strong interest in manifestations of quark degrees of freedom in medium energy nuclear and particle physics. Within the framework of multiquark states the emphasis has centered on states with more than three quarks bound by colour forces rather than by the conventional mesonic forces. Dibaryon systems have played an important role within that framework. One of the most spectacular and exciting predictions is the possible existence, according to the MIT bag model, of a stable, flavor-singlet, strangeness = /sup -/2,J/sup P/ = 0/sup +/ dihyperon, called by R. Jaffe the H particle. It is a six-quark object (2u, 2d, 2s quarks) with a predicted mass around 2150 MeV, i.e., below the ..lambda lambda.. mass with a binding energy around 80 MeV. Its decay channels would be restricted to ..sigma..N and ..lambda..N, via the weak interaction. The relevant two body states are shown. A similar prediction was obtained on the basis of the same model by Mulders et al., with a mass of 2164 MeV for this state. For completeness it should be mentioned that in a recent estimate of the center-of-mass correction to the static MIT bag model, the authors suggest that the dilambda mass moves up to just above the ..lambda lambda.. threshold. These calculations are undergoing further tets. Although all these results come from a specific model, Lipkin has argued that the general features of QCD and the known baryon mass splittings imply that the six-quark state with charge zero, spin zero, and strangeness = /sup -/2 would have the greatest binding potential.

• Research Organization: Carnegie-Mellon Univ., Pittsburgh, PA (USA)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-76ER03244
• OSTI ID: 7061628
• Report Number(s): DOE/ER/03244-99; COO-3244-99; CONF-820745-2; ON: DE83001040
• Resource Relation: Conference: 2. LAMPF workshop, Los Alamos, NM, USA, 19 Jul 1982
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
DIBARYON RESONANCES
QUANTUM CHROMODYNAMICS
BAG MODEL
EXPERIMENT PLANNING
QUARK MODEL
STRANGENESS
BARYON RESONANCES
BARYONS
COMPOSITE MODELS
ELEMENTARY PARTICLES
EXTENDED PARTICLE MODEL
FERMIONS
FIELD THEORIES
HADRONS
MATHEMATICAL MODELS
PARTICLE MODELS
PARTICLE PROPERTIES
PLANNING
QUANTUM FIELD THEORY
RESONANCE PARTICLES
645204* - High Energy Physics- Particle Interactions & Properties-Theoretical- Strong Interactions & Properties