TY - JOUR
T1 - Relativistic three-body calculations of a Y = 1, I=32, JP = 2 + πΛN-πσN dibaryon
AU - Garcilazo, H.
AU - Gal, A.
PY - 2013/1/2
Y1 - 2013/1/2
N2 - The πΛ. N-πσ. N coupled-channel system with quantum numbers (Y, I, JP)=(1, 32, 2+) is studied in a relativistic three-body model, using two-body separable interactions in the dominant p-wave pion-baryon and S13 YN channels. Three-body equations are solved in the complex energy plane to search for quasibound state and resonance poles, producing a robust narrow πΛN resonance about 10-20 MeV below the πσN threshold. Viewed as a dibaryon, it is a S25 quasibound state consisting of σ(1385). N and δ(1232). Y components. Comparison is made between the present relativistic model calculation and a previous, outdated nonrelativistic calculation which resulted in a πΛN bound state. Effects of adding a K̄NN channel are studied and found insignificant. Possible production and decay reactions of this (Y,I,JP)=(1,32,2+) dibaryon are discussed.
AB - The πΛ. N-πσ. N coupled-channel system with quantum numbers (Y, I, JP)=(1, 32, 2+) is studied in a relativistic three-body model, using two-body separable interactions in the dominant p-wave pion-baryon and S13 YN channels. Three-body equations are solved in the complex energy plane to search for quasibound state and resonance poles, producing a robust narrow πΛN resonance about 10-20 MeV below the πσN threshold. Viewed as a dibaryon, it is a S25 quasibound state consisting of σ(1385). N and δ(1232). Y components. Comparison is made between the present relativistic model calculation and a previous, outdated nonrelativistic calculation which resulted in a πΛN bound state. Effects of adding a K̄NN channel are studied and found insignificant. Possible production and decay reactions of this (Y,I,JP)=(1,32,2+) dibaryon are discussed.
KW - Dibaryons
KW - Faddeev equations
KW - Hyperon-nucleon interactions
KW - Pion-baryon interactions
UR - http://www.scopus.com/inward/record.url?scp=84870550112&partnerID=8YFLogxK
U2 - 10.1016/j.nuclphysa.2012.11.006
DO - 10.1016/j.nuclphysa.2012.11.006
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AN - SCOPUS:84870550112
SN - 0375-9474
VL - 897
SP - 167
EP - 178
JO - Nuclear Physics A
JF - Nuclear Physics A
ER -