Semileptonic decay constants of octet baryons in the chiral quark-soliton model

Journal Article · Thu Jan 01 04:00:00 EST 1998 · Physical Review, D

DOI:https://doi.org/10.1103/PhysRevD.57.299· OSTI ID:566113

Kim, H; Polyakov, M V; Praszalowicz, M; Goeke, K ^[1]

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1. Institute for Theoretical Physics II, Ruhr-University Bochum, D-44780 Bochum (Germany)

Based on the recent study of the magnetic moments and axial-vector constants within the framework of the chiral quark-soliton model, we investigate the baryon semileptonic decay constants (f{sub 1},f{sub 2}) and (g{sub 1},g{sub 2}). Employing the relations between the diagonal transition matrix elements and off-diagonal ones in the vector and axial-vector channels, we obtain the ratios of baryon semileptonic decay constants f{sub 2}/f{sub 1} and g{sub 1}/f{sub 1}. The F/D ratio is also discussed and found that the value predicted by the present model naturally lies between that of the Skyrme model and that of the nonrelativistic quark model. The singlet axial-vector constant g{sub A}{sup (0)} can be expressed in terms of the F/D ratio and g{sub A}{sup (3)} in the present model and turns out to be small. The results are compared with available experimental data and found to be in good agreement with them. In addition, the induced pseudotensor coupling constants g{sub 2}/f{sub 1} are calculated, the SU(3) symmetry breaking being considered. The results indicate that the effect of SU(3) symmetry breaking might play an important role for some decay modes in hyperon semileptonic decay. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 566113
• Journal Information: Physical Review, D, Journal Name: Physical Review, D Journal Issue: 1 Vol. 57; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
BARYONS
CHIRAL SYMMETRY
HYPERONS
MAGNETIC MOMENTS
MATRIX ELEMENTS
OCTET MODEL
QUARK MODEL
SEMILEPTONIC DECAY
SKYRME POTENTIAL
SOLITONS
SU-3 GROUPS
SYMMETRY BREAKING