Analysis of 56-plet positive parity baryon decays in the 1/N{sub c} expansion

Journal Article · Thu Oct 01 04:00:00 EDT 2009 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.80.074027· OSTI ID:21325242

Goity, J L ^[1]; Jayalath, C ^[1]; Scoccola, N N ^[2]

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1. Department of Physics, Hampton University, Hampton, Virginia 23668 (United States)
2. Physics Department, Comision Nacional de Energia Atomica, 1429 Buenos Aires (Argentina)

The partial decay widths of positive parity baryons belonging to 56-plets of SU(6) are analyzed in the framework of the 1/N{sub c} expansion. The channels considered are those with emission of a single {pi}, K, or K meson, and the analysis is carried out to subleading order in 1/N{sub c} and to first order in SU(3) symmetry breaking. The results for the multiplet [56,0{sup +}], to which the Roper resonance belongs, indicate a poor description of the widths at leading order, requiring important next to leading order corrections. For the multiplet [56,2{sup +}], the P wave decays in the nonstrange sector are well described at leading order, while the F wave decays require the next to leading order corrections, which turn out to be of natural magnitude. SU(3) breaking effects are poorly determined, because only few decays with a K meson in the final state are established, and their widths are not known with sufficient accuracy.

• OSTI ID: 21325242
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 7 Vol. 80; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
EMISSION
EXPANSION
F WAVES
KAONS
MESONS
N-1440 BARYONS
P WAVES
PARITY
PARTICLE DECAY
PIONS
SU-3 GROUPS
SU-6 GROUPS
SYMMETRY BREAKING