Semileptonic Decay Constants of Octet Baryons in the Chiral Quark-soliton Model * Typeset Using Revt E X
نویسندگان
چکیده
Based on the recent study of the magnetic moments and axial constants within the framework of the chiral quark-soliton model, we investigate the baryon semileptonic decay constants (f1, f2) and (g1, g2). 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 f2/f1 and g1/f1. 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 constant g (0) A can be expressed in terms of the F/D ratio and g (3) A 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 g2/f1 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. PACS: 12.39.Fe, 13.30.Ce, 14.20.Jn Typeset using REVTEX ∗Dedicated to Professor Richard Lemmer on the occasion of his 65th birthday. †On leave of absence from PNPI, Gatchina, St.Petersburg 188350, Russia ‡On leave of absence from Institute of Physics, Jagellonian University, Cracow, Poland 1
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