Joint description of weak radiative and nonleptonic hyperon decays in broken SU ( 3 )

  • P . Żenczykowski
  • Published 2008

Abstract

We give a joint description of weak radiative (WR) and nonleptonic (NL) hyperon decays (HD) in broken SU(3). The two groups of decays are linked via SU(2)W spin symmetry and vector meson dominance (VMD). We use experimental information on the parity-conserving (p.c.) NLHD amplitudes to fix the corresponding WRHD amplitudes. With the latter known, the data on the WRHD branching ratios and asymmetries permit us to determine the parity-violating (p.v.) WRHD amplitudes in terms of two parameters corresponding to the two-quark and single-quark transitions. We obtain a good description of the data, and in particular a large Σ+ → pγ asymmetry. Then, using the SU(2)W+VMD route we determine the non-soft-meson correction term in the p.v. NLHD amplitudes. The latter is shown to subtract a substantial amount from the current-algebra commutator thus leading towards the resolution of the S:P discrepancy in NLHD. PACS numbers: 11.40.-q, 11.30.Hv, 13.30.-a, 14.20.Jn

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Cite this paper

@inproceedings{enczykowski2008JointDO, title={Joint description of weak radiative and nonleptonic hyperon decays in broken SU ( 3 )}, author={P . Żenczykowski}, year={2008} }