Baryon octet to decuplet electromagnetic transitions

Journal Article · Wed Sep 01 04:00:00 EDT 1993 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.48.2230· OSTI ID:6025647

Leinweber, D B ^[1]; Draper, T ^[2]; Woloshyn, R M ^[3]

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1. Department of Physics and Center for Theoretical Physics, University of Maryland, College Park, Maryland 20742 (United States)
2. Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506 (United States)
3. TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, V6T 2A3 (Canada)

The electromagnetic transition moments of the SU(3)-flavor baryon octet to decuplet are examined within a lattice simulation of quenched QCD. The magnetic transition moment for the [ital N][gamma][leftrightarrow][Delta] channel is found to be in agreement with recent experimental analyses. The lattice results indicate [mu][sub [ital p][Delta]]/[mu][sub [ital p]]=0.88(15). In terms of the Particle Data Group convention, [ital f][sub [ital M]1]=0.231(41) GeV[sup [minus]1/2] for [ital p][gamma][leftrightarrow][Delta][sup +] transitions. Lattice predictions for the hyperon [ital M]1 transition moments agree with those of a simple quark model. However the manner in which the quarks contribute to the transition moments in the lattice simulation is different from that anticipated by quark model calculations. The scalar quadrupole form factor exhibits a behavior consistent with previous multipole analyses. The [ital E]2/[ital M]1 multipole transition moment ratios are also determined. The lattice results suggest [ital R][sub EM][equivalent to][minus][ital scrG][sub [ital E]2]/[ital scrG][sub [ital M]1]=+3[plus minus]8% for [ital p][gamma][leftrightarrow][Delta][sup +] transitions. Of particular interest are significant nonvanishing signals for the [ital E]2/[ital M]1 ratio in [Xi][sup [minus]] and [Sigma][sup [minus]] electromagnetic transitions.

• DOE Contract Number: FG05-87ER40322; FG05-84ER40154
• OSTI ID: 6025647
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 48:5; ISSN 0556-2821; ISSN PRVDAQ
• Country of Publication: United States
• Language: English

Related Subjects

662230 -- Quantum Chromodynamics-- (1992-)
662390* -- Electromagnetic Processes & Properties-- (1992-)
662410 -- Properties of Baryons & Baryon Resonances-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BARYON DECUPLETS
BARYON OCTETS
COMPUTERIZED SIMULATION
DIPOLE MOMENTS
E2-TRANSITIONS
ELECTRIC DIPOLE MOMENTS
ELECTRIC MOMENTS
ENERGY-LEVEL TRANSITIONS
FIELD THEORIES
FORM FACTORS
LATTICE FIELD THEORY
LIE GROUPS
M1-TRANSITIONS
MAGNETIC DIPOLE MOMENTS
MAGNETIC MOMENTS
MULTIPLETS
MULTIPOLE TRANSITIONS
PARTICLE MULTIPLETS
PARTICLE PROPERTIES
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
SIMULATION
SU GROUPS
SU-3 GROUPS
SYMMETRY GROUPS